BS EN 817:2008
ICS 91.140.70,
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
BRITISH STANDARD
Sanitary tapware —Mechanical mixingvalves (PN 10) —General technicalspecifications
Incorporating Corrigendum January 2009
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This British Standardwas published under the authority of theStandards Policy andStrategy Committee on 3
ember 2008© BSI 2009
ISBN 978 0 580 66666 7
Amendments/corrigenda issued since publication
Date Comments
BS EN 817:2008
National foreword
This British Standard is the UK implementation of EN 817:2008. Itsupersedes BS EN 817:1998 and which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/504/8, Sanitary tapware.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.
1Dec 31 200 Correction to low resolution 9January images
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BS EN 817:2008
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
EN 817
June 2008
ICS 91.140.70 Supersedes EN 817:1997
English Version
Sanitary tapware - Mechanical mixing valves (PN 10) - Generaltechnical specifications
Robinetterie sanitaire - Mitigeurs mécaniques (PN 10) -Spécifications techniques générales
Sanitärarmaturen - Mechanisch einstellbare Mischer (PN10) - Allgemeine technische Spezifikation
This European Standard was approved by CEN on 29 May 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATIONC O M I T É E U R O P É E N D E N O R M A LI S A T I O NEUR OP ÄIS C HES KOM ITEE FÜR NOR M UNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.
Ref. No. EN 817:2008: E
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BS EN 817:2008EN 817:2008 (E)
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Contents
page
Foreword..............................................................................................................................................................6 Introduction .........................................................................................................................................................7 1 Scope ......................................................................................................................................................8 2 Normative references ..........................................................................................................................10 3 Terms, definitions and designation ...................................................................................................10 3.1 Terms and definitions .........................................................................................................................10 3.2 Designation ..........................................................................................................................................11 4 Marking and identification ..................................................................................................................11 4.1 Marking .................................................................................................................................................11 4.2 Identification.........................................................................................................................................12 5 Materials ...............................................................................................................................................12 5.1 Chemical and hygiene requirements.................................................................................................12 5.2 Exposed surface conditions...............................................................................................................12 6 Dimensional characteristics ...............................................................................................................12 6.1 General remarks...................................................................................................................................12 6.2 Inlet dimensions...................................................................................................................................12 6.3 Outlet dimensions................................................................................................................................17 6.4 Mounting dimensions..........................................................................................................................19 6.5 Special cases .......................................................................................................................................20 6.6 Flexible hoses for shower outlets......................................................................................................20 6.7 Shower outlets .....................................................................................................................................20 7 Sequence of testing.............................................................................................................................21 8 Leaktightness characteristics ............................................................................................................21 8.1 General..................................................................................................................................................21 8.2 Test methods........................................................................................................................................21 8.3 Leaktightness of the obturator and of the mixing valve upstream of the obturators with the
obturator in the closed position.........................................................................................................22 8.4 Leaktightness of the mixing valve downstream of the obturator with the obturator open .........22 8.5 Leaktightness of manually operated diverter ...................................................................................22 8.6 Leaktightness and operation of diverter with automatic return .....................................................23 8.7 Leaktightness of the obturator: cross flow between hot water and cold water............................24 9 Pressure resistance characteristics – mechanical performance under pressure ........................26 9.1 General..................................................................................................................................................26 9.2 Principle................................................................................................................................................26 9.3 Apparatus .............................................................................................................................................26 9.4 Mechanical behaviour upstream of the obturator – obturator in the closed position..................26 9.5 Mechanical behaviour downstream of the obturator – obturator in the open position ...............26 10 Hydraulic characteristics ....................................................................................................................27 10.1 General..................................................................................................................................................27 10.2 Initial settings.......................................................................................................................................27 10.3 Principle................................................................................................................................................28 10.4 Apparatus .............................................................................................................................................28 10.5 Procedure .............................................................................................................................................28 10.6 Determination of flow rate ..................................................................................................................29 10.7 Determination of sensitivity................................................................................................................30 11 Mechanical strength characteristics - torsion test for operating mechanism ..............................33
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11.1 General..................................................................................................................................................33 11.2 Test method .........................................................................................................................................33 12 Mechanical endurance characteristics..............................................................................................34 12.1 Mechanical endurance of the control device....................................................................................34 12.2 Mechanical endurance of diverters ...................................................................................................38 12.3 Mechanical endurance of swivel spouts...........................................................................................40 13 Backflow protection ............................................................................................................................41 14 Acoustic characteristics .....................................................................................................................41 14.1 General..................................................................................................................................................41 14.2 Procedure .............................................................................................................................................41 14.3 Requirements.......................................................................................................................................41 Annex A (informative) Apparatus ..................................................................................................................43 Annex B (informative) Pressure take-off tee.................................................................................................47 Bibliography......................................................................................................................................................50
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BS EN 817:2008EN 817:2008 (E)
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Figures
Figure 1 Supply system with a pressure range of (0,05 to 1,0) MPa [(0,5 to 10) bar].............................9 Figure 2 Flexible hoses and plain tube .....................................................................................................14 Figure 3 Multi-hole mechanical mixing valve...........................................................................................15 Figure 4 Supply connections for mechanical mixing valve and remote outlets ..................................16 Figure 5 Remote outlet ...............................................................................................................................18 Figure 6 Single hole mechanical mixing valve.........................................................................................18 Figure 7 Two hole mechanical mixing valve ............................................................................................18 Figure 8 Single hole mechanical mixing valve.........................................................................................19 Figure 9 Two hole mechanical mixing valve ............................................................................................20 Figure 10 Sensitivity curve...........................................................................................................................31 Figure 11 Radius for the determination of sensitivity ...............................................................................32 Figure 12 Rectangular movement ...............................................................................................................34 Figure 13 Triangular movement...................................................................................................................35 Figure 14 Test bench adjustment torque for conventionnal mixing valve..............................................37 Figure 15 Test bench adjustment torque for joystick mixing valve.........................................................37 Figure 16 Test bench adjustment torque for sequential mixing valve ....................................................37 Figure A 1 Supply circuits ........................................................................................................................43 Figure A 2 Test circuit...............................................................................................................................45 Figure A 3 Mounting of the mixing valve ................................................................................................46 Figure B 1 Pressure take-off tee ..............................................................................................................47 Figure B 2 Schematic examples of pressure take-off tees ...................................................................48
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Tables
Table 1 Conditions of use/Classifications........................................................................................................8 Table 2 Designation ..........................................................................................................................................11 Table 3 Inlet dimensions (mechanical mixing valve).....................................................................................13 Table 4 Outlet dimensions (Remote outlets, mechanical mixing valve) .....................................................17 Table 5 Mounting dimensions (Outlets, single- and multi-hole mechanical mixing valve).......................19 Table 6 Test Sequence .....................................................................................................................................21 Table 7 Summary of leaktightness tests ........................................................................................................25 Table 8 Summary of pressure resistance characteristic tests.....................................................................27 Table 9 Initial Settings ......................................................................................................................................27 Table 10 Flow rates according to application...........................................................................................29 Table 11 Performance levels ......................................................................................................................30 Table 12 Summary of test conditions for cartridges ...............................................................................35 Table 13 Summary of test conditions for diverters..................................................................................39 Table 14 Flow rate classes (EN ISO 3822-4 Annex A)..............................................................................41 Table 15 Acoustic group.............................................................................................................................42 Table A 1 Connecting dimension ................................................................................................................45 Table B 1 Dimensions of the pressure take-off tee ...................................................................................47
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BS EN 817:2008EN 817:2008 (E)
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Foreword
This document (EN 817:2008) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2008, and conflicting national standards shall be withdrawn at the latest by December 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 817:1997.
This European Standard acknowledges the field of application for mechanical mixing valves used in water supply systems with a pressure range of (0,05 to 1,0) MPa (0,5 bar to 10 bar).
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
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Introduction
In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this European Standard.
This European Standard provides no information as to whether the product can be used without restriction in any of the Member States of the EU or EFTA.
It should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of these products remain in force.
This document identifies characteristics and technical requirements for mechanical mixing valves.
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BS EN 817:2008EN 817:2008 (E)
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1 Scope
This European Standard specifies:
the dimensional, leaktightness, pressure resistance, hydraulic performance, mechanical strength, endurance and acoustic characteristics with which mechanical mixing valves need to comply;
test methods to verify the characteristics.
The tests described in this European Standard are type tests (laboratory tests) and not quality control tests carried out during manufacture.
This European Standard applies to PN 10 mechanical mixing valves for use with sanitary appliances installed in rooms used for bodily hygiene (cloakrooms, bathrooms, etc.) and in kitchens, i.e. for use with baths, wash basins, bidets, showers and sinks.
The conditions of use and classifications are given in 0.
Table 1 — Conditions of use/classifications
Operating range of mechanical mixing valves
Flow rate classes
Acoustics Marking Water supply system
Limits Recommended See 0 See Clause 14 See Clause 4
Pressure
Dynamic pressure > 0,05 MPa
(0,5 bar) Static pressure
≤ 1,0 MPa (10,0 bar)
Dynamic pressure (0,1 to 0,5) MPa [(1,0 to 5,0) bar]
Z ≤ 0,15 l/s A ≤ 0,25 l/s S ≤ 0,33 l/s B ≤ 0,42 l/s C ≤ 0,50 l/s D ≤ 0,63 l/s
Group I -
Group II –
unclassified
for example IA
IIC / B
I /- a II /- a
Temperature ≤ 90 °C ≤ 65 °C
a Without flow rate class: mechanical mixing valves without interchangeable outlet accessories are tested with the original outlet accessories of the manufacturer and are not marked with a flow rate class.
NOTE Mechanical mixing valves for use at pressures lower than those in Table 1 are covered by EN 1286.
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Key 1 cold water 2 hot water 3 mains supply pipe (supply pressures up to 10 bar) 4 water heater
Figure 1 — Supply system with a pressure range of (0,05 to 1,0) MPa [(0,5 to 10) bar]
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2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 246, Sanitary tapware — General specifications for flow rate regulators
EN 248, Sanitary tapware — General specification for electrodeposited coatings of Ni-Cr
EN 1112, Sanitary tapware – Shower outlets for sanitary tapware for water supply systems of type 1 and type 2 – General technical specification
EN 1113, Sanitary tapware – Shower hoses for sanitary tapware for water supply systems of type 1 and type 2 – General technical specification
EN 1717, Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflow
prEN 13618-1, Hose assembly — Flexible hose assembly — Part 1: Product standard for flexible hose assembly (with or without braiding)
prEN 13618-2, Water supply — Hose assembly — Part 2: Semi-rigid hose assembly
EN 14506, Devices to prevent pollution by backflow of potable water — Automatic diverter — Family H, type C
EN ISO 228-1, Pipe threads where pressure tight joints are not made on the threads — Part 1: Dimensions, tolerances and designation (ISO 228-1:2000)
EN ISO 3822-1, Acoustics — Laboratory tests on noise emission from appliances and equipment used in water supply installations — Part 1: Method of measurement (ISO 3822-1:1999)
EN ISO 3822-2, Acoustics — Laboratory tests on noise emission from appliances and equipment used in water supply installations — Part 2: Mounting and operating conditions for draw-off taps and mixing valves (ISO 3822-2:1995)
EN ISO 3822-4:1997, Acoustics — Laboratory tests on noise emission from appliances and equipment used in water supply installations — Part 4: Mounting and operating conditions for special appliances (ISO 3822-4:1997)
3 Terms, definitions and designation
3.1 Terms and definitions
For the purpose of this document, the following term and definition applies.
mechanical mixing valve valve which mixes hot and cold water and which, by means of a control device, allows the user to adjust between ‘all cold water’ and ’all hot water’, which implies the flow rate of the mixture obtained may be adjusted between ‘no flow’ and ‘maximum flow’ using either the same control device or another separate control device
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3.2 Designation
Mechanical mixing valves covered by this European Standard are designated by the characteristics identified in 0.
Table 2 — Designation
Tapware according to application (see 0)
Type of valve Mechanical mixing valve
Intended use Basin, bidet, sink, bath or shower
Mounting method Horizontal or vertical surfaces
Body Single or multi-hole, visible, or concealed
Diverter With or without diverter
Type of outlet Fixed, moveable, divided outlet spout, with or without flow rate regulator
Acoustic group and classification Group I, or group II, or unclassified
Water saving properties Yes / no
Flow rate class Z, A, S, B, C, D
Reference to this European Standard EN 817
Example of designation:
Mechanical mixing valve for bath/shower, 2-hole with combined visible body, mounting on horizontal surface, diverter, fixed outlet, flow rate classes C/B, with acoustic group I, EN 817.
4 Marking and identification
4.1 Marking
Mechanical mixing valves shall be marked permanently and legibly with:
the manufacturer's or agent’s name or identification - on the body or handle;
the manufacturer's name or identification - on the cartridge (not applicable when the cartridge is of special design to suit the body);
the acoustic group (see 0) and the flow rate class(es) (see 0), if applicable - on the body.
For water saving mixing valves, appropriate information to installers and users shall be provided.
NOTE In the case of bath/shower mixing valves, the flow rate is indicated by the first letter for the bath outlet and by the second letter for the shower outlet.
Examples of marking:
Name or identification and IA, or IIA (acoustic group and flow rate class(es))
Name or identification and I/-, or II/- (acoustic group, without flow rate class(es))
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Name or identification and IC/A, or IIC/A (bath/shower tap; the first letter for the bath outlet, the second letter for the shower outlet).
4.2 Identification
The control devices for mechanical mixing valves shall be identified:
for cold water by the colour blue or word/letters for cold;
for hot water by the colour red or word/letters for hot;
any other suitable means.
5 Materials
5.1 Chemical and hygiene requirements
All materials coming into contact with water intended for human consumption shall present no risk to health.
They shall not cause any change of the drinking water in terms of quality, appearance, smell or taste.
5.2 Exposed surface conditions
Visible chromium plated surfaces and Ni-Cr coatings shall comply with the requirements of EN 248.
6 Dimensional characteristics
6.1 General remarks
The design and construction of components without defined dimensions permit various design solutions to be adopted by the manufacturer.
Special cases are covered in 6.5.
6.2 Inlet dimensions
Inlet dimensions shall be as specified in Table 3, 0, 0 and 0.
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Table 3 — Inlet dimensions (mechanical mixing valve)
Dimensions (mm) Comments
Shank, union, captive nut
A G ½ B Shank, union In accordance with EN ISO 228-1
A 2 9 min Captive nut
A 3 15 min Shank, Union (straight or eccentric) Useful thread length
Connecting centres
G a 150 + 1 Supply connection, Straight unions
G 1 140 to 160 2 – hole wall mounted - with eccentric unions (extension of this
range is permitted)
Inlet connections
N 1 12,3 + 0,2
N 2 5 min Type A
N 1 15,2 + 0,05
N 2 13 min
Type B 30° chamfer/flat 0,3
N 1 14,7 + 0,3
N 2 6,4 min Type C
N 1 19,9 + 0,3
N 2 6,4 min Type C
T Plain end ∅ 10 or 12 or 15 or G ½ or G 3/8 male or female Copper tube(s) or flexible hose(s)
U 350 min Tube(s) or flexible hose(s) Flexible hoses in accordance with prEN 13618-1 and/or prEN 13618-2
a Other dimensions are permissible (for replacement) when market tradition requires it, provided the manufacturer specifies the actual dimension in literature to avoid confusion with the standard dimension – which can be achieved using an excentric connection.
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1 2
Key 1 flexible hose 2 plain tube
Figure 2 — Flexible hoses and plain tube
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Figure 3 — Multi-hole mechanical mixing valve
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Figure 4 — Supply connections for mechanical mixing valve and remote outlets
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6.3 Outlet dimensions
Outlet dimensions shall be as specified in Table 4, 0, 0 and 0.
When nozzle outlets are used with flow rate regulators conforming to EN 246, the manufacturing tolerances chosen for the connecting threads of the outlets shall be compatible with those of the connecting threads of the flow rate regulators in order to ensure interchangeability.
Table 4 — Outlet dimensions (remote outlets, mechanical mixing valve)
Dimensions (mm) Comments
E 25 min
Outlet orifice
- Lowest point
- All mixing valves and outlets
Dimension from lowest point of the outlet orifice including any flow rate regulator or flow straightener to the mounting surface. Regulations exist in some EU Member States that set dimensions greater than those indicated in this European Standard.
D 1 90 min Horizontal mounted mechanical mixing valve
D 3 115 min Wall mounted mechanical mixing valve Separate spout
Dimension from the centre of outlet orifice including any flow rate regulator or flow straightener.
A G ½ B Remote outlet In accordance with EN ISO 228-1
A 4 7,5 min Useful thread length
A 5 9,5 min Shower outlet
Free length of connection
Nozzle outlets to accept flow rate regulators shall be in accordance with EN 246.
NOTE Nozzle outlets not in accordance with EN 246 are covered by 6.5
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Figure 5 — Remote outlet Figure 6 — Single hole mechanical mixing valve
Figure 7 — Two hole mechanical mixing valve
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6.4 Mounting dimensions
Mounting dimensions shall be as specified in Table 5, 0 and 0.
Table 5 — Mounting dimensions (outlets, single- and multi-hole mechanical mixing valve)
Dimensions (mm) Comments
Shank diameter
H 1 24 max Two hole mechanical mixing valve size ½ Adjustable centres
H 2 29 max Side spray Adjustable centres
H 3 33,5 max Single hole
Base or flange
J 1 42 min Side spray
J 2 45 min Bath, bath/shower, basin, bidet, sink Dimension of base or flange
J 3 50 max Single and multi hole mechanical mixing valve Diameter of clamping washer
V 32 max Basin, bidet, sink Flange projection to rear
V 1 35 max Bath – two hole mechanical mixing valve
L Dimension which allows taps and outlets to be fitted on to supports of thickness between 1 mm and 18 mm.
Minimum range (mm) of supports, which allows the installation of the mixing valves.
1 2
Key 1 basin – bidet – sink 2 remote spray attachment
Figure 8 — Single hole mechanical mixing valve
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Figure 9 — Two hole mechanical mixing valve
6.5 Special cases
Mechanical mixing valves intended for special applications, e.g. for installation on sanitary appliances not conforming with European Standards, or where dimensional interchangeability is not a requirement can incorporate dimensional deviations provided that:
all other requirements of this standard are satisfied;
secure fixing to the mounting surface is provided with all fixing holes covered;
thread connections to the supply pipes comply with EN ISO 228-1;
the air gap dimension E ≥ 25 mm or a backflow prevention device is provided in accordance with EN 1717.
the D 1 dimension is coordinated with the sanitary appliance.
The manufacturer's literature including the installation instructions supplied with the tapware shall indicate clearly that the tapware is for special application.
6.6 Flexible hoses for shower outlets
Requirements for flexible hoses for shower outlets shall be as specified in EN 1113.
6.7 Shower outlets
Requirements for shower outlets shall be as specified in EN 1112.
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7 Sequence of testing
The samples shall be subjected to the test sequence shown in Table 6.
Table 6 — Test sequence
Sequence Sample 1 Sample 2
1 dimensions
2 leaktightness (Clause 8)
flow rate/sensitivity (Clause 10)
3 endurance (Clause 12)
mechanical strength (Clause 11)
4 leaktightness (Clause 8)
leaktightness (Clause 8)
5 pressure resistance (Clause 9)
NOTE Acoustic testing will require three samples which can be different from the two mentioned above.
8 Leaktightness characteristics
8.1 General
This clause describes the test methods that shall be carried out to verify the leaktightness of the mechanical mixing valve and specifies the corresponding requirements (see 0).
8.2 Test methods
8.2.1 Principle
The principle of the test consists of checking under cold water pressure the leaktightness of:
the obturator (see 8.3);
the complete mixing valve (see 8.4);
the bath/shower diverter (either manual or with automatic return) (see 8.5 and 8.6).
In the case of a diverter with automatic return being considered to provide backflow prevention, it shall comply with the requirements of EN 14506.
8.2.2 Apparatus
A hydraulic test circuit capable of gradually supplying the required static and dynamic pressures and of maintaining them throughout the duration of the test(s).
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8.3 Leaktightness of the obturator and of the mixing valve upstream of the obturator with the obturator in the closed position
8.3.1 Procedure
a) Connect the mixing valve to the test circuit;
b) with the outlet orifice open, and the obturator closed;
c) apply to the inlet of the mixing valve a water pressure of (1,6 ± 0,05) MPa [(16,0 ± 0,5) bar] and maintain it for (60 ± 5) s.; during this period, move the temperature control device over its full operating range.
8.3.2 Requirements
Verification of leaktightness upstream of the obturator:
throughout the duration of the test there shall be no leakage or seepage through the walls;
Verification of leaktightness of the obturator:
throughout the duration of the test there shall be no leakage of the obturator, i.e. at the outlet.
8.4 Leaktightness of the mixing valve downstream of the obturator with the obturator open
8.4.1 General
Not applicable when the outlet cannot be closed.
8.4.2 Procedure
a) Connect the mixing valve to the test circuit;
b) with the outlet orifice(s) artificially closed, and the obturator open;
c) apply to the inlet of the mixing valve a water pressure of (0,4 ± 0,02) MPa [(4,0 ± 0,2) bar] and maintain it for (60 ± 5) s; during this period, move the temperature control device over its full operating range;
d) reduce gradually the pressure to (0,02 ± 0,002) MPa [(0,2 ± 0,02) bar] and maintain it for (60 ± 5) s.
8.4.3 Requirement
Throughout the duration of the test there shall be no leakage, or seepage through the walls.
8.5 Leaktightness of manually operated diverter
8.5.1 Procedure: flow to bath
a) Connect the mixing valve, in its normal position of use, to the test circuit;
b) put the diverter in the flow-to-bath mode, the outlet to bath being artificially closed and the outlet to shower open;
c) apply a static water pressure of (0,4 ± 0,02) MPa [(4,0 ± 0,2) bar] and maintain it for (60 ± 5) s;
d) gradually reduce the pressure to (0,02 ± 0,002) MPa [(0,2 ± 0,02) bar] and maintain it for (60 ± 5) s;
e) check for leakage at the outlet to shower.
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8.5.2 Requirement: flow to bath
There shall be no leakage at the outlet to shower.
8.5.3 Procedure: flow to shower
a) Put the diverter in the flow-to-shower mode, the outlet to shower being artificially closed and the outlet to bath open;
b) apply a static water pressure of (0,4 ± 0,02) MPa [(4,0 ± 0,2) bar] and maintain it for (60 ± 5) s;
c) gradually reduce the pressure to (0,02 ± 0,002) MPa [(0,2 ± 0,02) bar] and maintain it for (60 ± 5) s;
d) check for leakage at the outlet to bath.
8.5.4 Requirement: flow to shower
There shall be no leakage at the outlet to bath.
8.6 Leaktightness and operation of diverter with automatic return
8.6.1 Procedure: flow to bath
a) Connect the mixing valve, in its normal position of use, to the test circuit;
b) connect the hydraulic resistance corresponding to the flow rate class marking – see EN ISO 3822-4 to the shower outlet (for example: for marking A, class A resistance will be used during testing);
c) put the diverter in the flow-to-bath mode with the outlets to bath and shower open;
d) apply a dynamic pressure of (0,4 ± 0,02) MPa [(4,0 ± 0,2) bar] and maintain it for (60 ± 5) s;
e) check for leakage at the outlet to shower.
8.6.2 Requirement: flow to bath
There shall be no leakage at the outlet to shower.
8.6.3 Procedure: flow to shower
a) Put the diverter in the flow-to-shower mode with the outlets to bath and shower open;
b) apply a dynamic pressure of (0,4 ± 0,02) MPa [(4,0 ± 0,2) bar] and maintain it for (60 ± 5) s;
c) check for leakage at the outlet to bath;
d) gradually reduce the pressure to (0,05 ± 0,002) MPa [(0,5 ± 0,02) bar] and maintain it for (60 ± 5) s;
e) check the diverter position and check for leakage at the outlet to bath;
f) close the mixing valve obturator; check the diverter position.
8.6.4 Requirement: flow to shower
There shall be no leakage at the outlet to bath whilst the diverter remains in the flow to shower position;
the diverter shall not return to the flow to bath position at any pressure ≥ (0,05 ± 0,002) MPa [(0,5 ± 0,02) bar];
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the diverter shall return to the flow to bath position when the obturator is closed.
8.6.5 Continuation procedure: flow to bath
a) Re-open the mixing valve obturator;
b) re-apply a dynamic pressure of (0,05 ± 0,002) MPa [(0,5 ± 0,02) bar] and maintain it for (60 ± 5) s.
8.6.6 Requirement: flow to bath
There shall be no leakage at the outlet to shower.
8.7 Leaktightness of the obturator: cross flow between hot water and cold water
8.7.1 Procedure
a) Connect one inlet of the mixing valve to the test circuit;
b) with the outlet orifice open and the obturator closed, apply a water pressure of (0,4 ± 0,02) MPa [(4 ± 0,2) bar] to the mixing valve and maintain it for (60 ± 5) s; in this period, move the temperature control device over its full operating range;
c) repeat the test, reversing the water supply connection to the other inlet.
8.7.2 Requirement
Throughout the duration of the test, there shall be no leakage or seepage at the outlet or at the end of the unconnected inlet.
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Table 7 — Summary of leaktightness tests
Cold water test
Test conditions
Pressure Duration
Leaktightness of:
Mixing valve, Diverters Position of obturator(s)
or diverter
Condition of outlet orifice(s)
(MPa) (s)
Requirement: No leakage
Upstream of obturator Obturator closed Open 1,6 ± 0,05 60 ± 5
- past obturator or through walls upstream of obturator
0,4 ± 0,02
Mixing valve assembly
Downstream of obturator Obturator open Closed
0,02 ± 0,002 60 ± 5 - past any seal
Obturator open, diverter in flow-to-bath mode
Artificially closed
outlet to bath,
outlet to shower open
- at outlet to shower
Diverter- manually operated
Obturator open, diverter in flow-to-shower mode
Artificially closed
outlet to shower, outlet to
bath open
0,4 ± 0,02 0,02 ± 0,002
60 ± 5
- at outlet to bath
Obturator open, diverter in flow-to-bath mode
0,4 ± 0,02 0,02 ± 0,002
60 ± 5 - at hose attachment point
Obturator open, diverter in flow-to-shower mode
- at outlet to bath
Obturator open, diverter in flow-to-shower mode
0,05 ± 0,002 or
0,02 ± 0,002
- no reversion of diverter; - no leakage to bath
Obturator closed Diverter reverts to flow to bath mode
Diverter- with automatic return
Obturator open, diverter in flow-to-bath mode
Both outlets open
0,05 ± 0,002 or
0,02 ± 0,002 60 ± 5 - no leakage at
outlet to shower
Cross flow Obturator closed Open 0.4 ± 0,02 60 ± 5
no leakage at outlet or unconnected inlet
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9 Pressure resistance characteristics – mechanical performance under pressure
9.1 General
This clause describes the test method that shall be carried out to verify the mechanical performance under high pressure and specifies the test criteria.
9.2 Principle
The principle is to detect any deformation of the mechanical mixing valve which may occur using cold water under pressure. The test is carried out both upstream and downstream of the obturator.
9.3 Apparatus
A hydraulic test circuit capable of supplying and of maintaining the required pressures for the test duration.
9.4 Mechanical behaviour upstream of the obturator – obturator in the closed position
9.4.1 Procedure
a) Connect the mixing valve to the test circuit;
b) with the obturator closed;
c) apply at the mechanical mixing valve inlet a static water pressure of (2,5 ± 0,05) MPa [(25,0 ± 0,5) bar] and maintain it for (60 ± 5) s;
d) check whether there is permanent deformation in any part of the mixing valve upstream of the obturator.
9.4.2 Requirement
Throughout the duration of the test, there shall be no permanent deformation of any part of the mixing valve.
9.5 Mechanical behaviour downstream of the obturator – obturator in the open position
9.5.1 Procedure
a) Connect the mixing valve as supplied to the test circuit;
b) open the mixing valve obturator fully;
c) for mixing valves with a flow rate regulator fitted, apply at the mixing valve inlet a dynamic water pressure of (0,4 ± 0,02) MPa [(4,0 ± 0,2) bar] and maintain it for (60 ± 5) s;
d) for mechanical mixing valves without flow rate regulator, apply at the inlets, for (60 ± 5) s, the water pressure needed to give a flow rate of (0,4 ± 0,04) l/s through the mixing valve;
e) for mixing valves with removable flow rate regulator, the test is carried out both with and without this regulator;
f) check whether there is permanent deformation in any part of the mixing valve downstream of the obturator.
9.5.2 Requirement
There shall be no permanent deformation in any part of the mechanical mixing valve.
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Table 8 — Summary of pressure resistance characteristic tests
Cold water test Test conditions Pressure resistance of:
Mixing valves Position of obturator(s)
Condition of outlet orifices
Pressure
(MPa)
Duration
(s) Requirement
Mixing valve assembly
Upstream of obturator
Obturator closed Open
(2,5 ± 0,05) MPa
[(25,0 ± 0,5) bar]
Downstream of obturator mixing valves with flow rate regulator
(0,4 ± 0,02) MPa
[(4,0 ± 0,2) bar]
No permanent deformation
Downstream of the obturator without flow rate regulator
Obturator open Open
Pressure to give 0,4 l/s
60 ± 5
No permanent deformation of parts situated downstream of the obturator
10 Hydraulic characteristics
10.1 General
This clause specifies test methods to determine the following characteristics of mechanical mixing valves:
flow rate (see 10.6);
sensitivity (see 10.7).
10.2 Initial settings
When called-up in a specific test procedure, the samples and their supplies shall initially be adjusted as shown in Table 9.
Table 9 — Initial settings
Inlet
Cold Hot
Temperature ϑc (°C)
Pressure (MPa) [bar]
Temperature ϑ h (°C)
Pressure (MPa) [bar]
(10 to 15) ( 0,02
0- 3,0 + )
[ 0,20- 3 + ]
(ϑC + 50) ±1 ( 0,02
0- 3,0 + )
[ 0,20- 3 + ]
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10.3 Principle
The principle of the test consists of verifying the hydraulic performance of the mixing valve under test when supplied and operated as specified.
10.4 Apparatus
The test rig shall comprise as applicable:
inlet and outlet pipework as specified in Annex A;
a cold water supply between (10 to 15) °C and a hot water supply between (60 to 65) °C maintaining their respective temperatures to within ± 1 K;
a device without backlash for automatic or non-automatic operation of the mechanical mixing valve's temperature and flow controls at a velocity of approximately 0,5 °/s or 0,8 mm/s.
10.5 Procedure
The test shall be conducted as follows:
a) Connect the mechanical mixing valve to the test rig;
b) flexible inlet connections shall be mounted in a straight position;
c) fit the operating device to the mechanical mixing valve's controls:
For mixing valves with a flow rate control device which is separate from the temperature control device, set it at the maximum flow position; for single control mixing valve, set the flow rate control device to the position providing maximum flow;
d) pressurize the test rig;
e) adjust the mechanical mixing valve's controls or its outlet pipework to deliver maximum flow;
f) adjust the supply temperatures and pressures in accordance with Table 9;
g) while the test rig remains pressurized, close the applicable flow controls;
h) when these adjustments have been made, return the control device to the off position with the mixing valve remaining under pressure.
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10.6 Determination of flow rate
10.6.1 Principle
The principle of the test consists of determining the flow rate of the mixing valve under test at a dynamic reference pressure of ( ) ( )[ ]bar 3 MPa 3,0 0,2
0-0,020-
++ , applied to the hot and cold water supplies, for the full extent of the temperature control range.
The measurement is made on a fully open mixing valve, going from cold to hot, then from hot to cold. If the mixing valve has standard accessories (aerators, showers, etc.), the measurement is carried out replacing these with a hydraulic resistance corresponding to the flow rate class marking, as defined in Table 14, see also EN 246 (for example: for marking A, class A resistance will be used during testing).
If the mixing valve is equipped with water saving accessories or aerators not complying with the dimensions specified in EN 246 the flow rate test and acoustic test shall be made with the mixing valve as delivered by the manufacturer.
10.6.2 Procedure
Open the flow rate control fully and operate the temperature control device for the full extent of its range at a pressure of ( ) ( )[ ]bar 3 MPa 3,0 0,2
0-0,020-
++ . Record the flow rate for at least the five temperatures specified below:
full cold position;
34 °C;
38 °C;
44 °C;
full hot position.
10.6.3 Requirements
The flow rate measured at ( ) ( )[ ]bar 3 MPa 3,0 0,20-
0,020-
++ shall, depending on the type of appliance for which the mixing valve is intended, be as specified in Table 10.
Table 10 — Flow rates according to application
Application of mixing valve Requirement
With water saving:
Basin, bidet, sink (4,0 to 9,0) l/min[(0,066 to 0,15) l/s]
Without water saving:
Basin, bidet, sink, shower min. 12,0 l/min (0,2 l/s) a
min. 19,0 l/min (0,316 l/s)(full cold or full hot position)
Bath min. 20,0 l/min (0,33 l/s) in the range of(34 °C to 44 °C)
a For mixing valve with pull out spray or spray attachments or flexible supply hoses a minimum flow rate of 9,0 l/min (0,15 l/s) shall apply.
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10.7 Determination of sensitivity
10.7.1 General
Sensitivity is characterised by the minimum amplitude movement of the temperature control device required for a limited temperature variation, within a given mixed water temperature range.
10.7.2 Principle
The principle of the test consists of verifying that, within the reference range Tm -4 °C to Tm +4 °C, the temperature deviation of 8 K corresponds to a movement of the temperature control device of amplitude at least equal to the values given in Table 11.
Average temperature: Tm = (Tc + Th)/2
10.7.3 Procedure
Connect the hydraulic resistance corresponding to the flow rate class marking – see EN ISO 3822-4 to the outlet (for example: for marking A, class A resistance will be used during testing).
Operate the temperature control device at a rate of approximately 0,5° angular/s or 0,8 mm/s with a supply pressure of ( ) ( )[ ]bar 3 MPa 3,0 0,2
0-0,020-
++ and measure the mixed water temperature as a function of the movement of the temperature control device with the flow rate control being fully open.
Take the measurement at the end of the control device. When the temperature control device reaches the end of its movement, return the device to its starting position.
If there is any doubt about the curve, repeat the test manually, with the appliance mounted in its normal installation position and compare the results. The most favourable result is used.
10.7.4 Evaluation of results
On the basis of the measurements carried out in 10.7.3, plot the curves of mean mixed water temperature (T) as a function of the movement G of the temperature control device.
From the curves obtained in this way, determine the two values of ranges G1 and G2 for the mixed water temperature zone between Tm -4 °C and Tm +4 °C (see 0).
Verify that the smaller of these two values G1 and G2 complies with the requirements of 10.7.5.
10.7.5 Requirements
The sensitivity measured shall, depending on the type of appliance for which the mixing valve is intended, be as specified in Table 11.
Table 11 — Performance levels
Actuation of the mixing valve b Basin, sink, bidet a Shower, bath/shower at shower outlet only
Control devices with r > 45 mm (see Figure 11) min. 10 mm min. 12 mm
Control devices with r ≤ 45 mm (see Figure 11)
min. 10° angular or min. 10 mm
min. 12° angular or min. 12 mm
a Basin, bidet or sink mixing valves are not tested if they are equipped with the same valve and control device as the shower and bath/shower mixing valve. b Including sequential mixing valve, joystick or any new technology.
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Key G displacement (degree or mm) T temperature (°C)
Figure 10 — Sensitivity curve
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Figure 11 — Radius for the determination of sensitivity
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11 Mechanical strength characteristics - torsion test for operating mechanism
11.1 General
This test shall be carried out before the mechanical endurance test.
This clause describes a test method that shall be carried out to verify the torsional strength of the operating mechanisms of mechanical mixing valves and specifies the test criteria.
11.2 Test method
11.2.1 Principle
The principle of the test consists of submitting the operating mechanism to a given torque to verify its strength with no water supplied.
11.2.2 Apparatus
This consists of either a torque wrench having an accuracy of 2 % fitted to the operating member or a lever arm and a device for measuring the force applied.
11.2.3 Test piece
The mixing valve with its operating mechanism.
11.2.4 Procedure
a) Fully open the obturator;
b) gradually apply over (4 + 2) s a torque of (6 ± 0,2) Nm to the operating mechanism in the opening direction;
c) maintain this torque for (300 +15) s;
d) fully close the obturator;
e) gradually apply over (4 + 2) s a torque of (6 ± 0,2) Nm to the operating mechanism in the closing direction;
f) maintain this torque for (300 +15) s.
11.2.5 Requirement
Following the test:
there shall be no deformation or other deterioration which impairs the function of the mixing valve;
the mixing valve shall satisfy the requirement for leaktightness (8.3).
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12 Mechanical endurance characteristics
12.1 Mechanical endurance of the control device
12.1.1 General
This clause specifies a test method to verify the mechanical endurance of the control device of a mechanical mixing valve and gives the corresponding specifications.
12.1.2 Test method
12.1.2.1 Principle
This consists of subjecting the control device to a specific number of movements (with a dwell time) at specified cold water and hot water pressures and temperatures.
For mixing valves with separate controls for flow rate and temperature, the test shall be carried out on each of these devices.
For mixing valves with single lever control for flow rate and temperature, the test is carried out according to 12.1.2.4.
12.1.2.2 Apparatus
This comprises circuits (hot water, cold water) and an automatic machine.
Each circuit comprising a pump or similar device, capable of supplying the required pressure at a temperature ≤ 30 °C for the cold water and (65 ± 2) °C for the hot water.
12.1.2.3 Automatic machine
The machine's mechanism shall carry out one of the cycles defined, according to the movement of the mixing valve.
Hot water Cold water
Open
Closed
One cycle 0 to 11
Key See 12.1.2.4
Figure 12 — Rectangular movement
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Hot water Cold water
Open
Closed
One cycle 0 to 8
Key See 12.1.2.4.
Figure 13 — Triangular movement
NOTE Continuous movements ensuring leaktightness on closure equal to approximately 95 % of the total travel.
For rectangular movement (see 0) one cycle consists of three opening and closing movements and two complete cold water, hot water, cold water movements.
For triangular movement (see 0) one cycle consists of three opening and closing movements and one complete cold water, hot water, cold water movement.
Table 12 — Summary of test conditions for cartridges
Hot water temperature (65 ± 2) °C
Cold water temperature ≤ 30 °C
Flow rate adjusted by downstream resistance (6 ± 1) l/min
Static pressure (0,4 ± 0,05) MPa [(4 ± 0,5) bar]
Speed (60 ± 5)° angular/s
Dwell time (5 ± 0,5) s
Reversal time on each direction change (0,5 ± 0,5) s
pH value 8 ± 1
Water hardness Indication in the test report of the measured value
Number of cycles 70 000 (rectangular or triangular or separate control movements)
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12.1.2.4 Procedure
a) Install the mixing valve in its normal position of use on the machine and connect it to both the cold water supply circuit and the hot water supply circuit.
b) Set the maximum force transmitted by the machine to open and close the flow control to a moment M of 3 Nm max. and to move the temperature control to a moment M1 of 3 Nm max. The machine shall stop if this torsional resistance value is reached on the mechanism (see Figures 14, 15 and 16).
c) With the mixing valve closed, set the hot water and cold water static pressures at the values given in 0.
d) Eccentric forces, which may cause abnormal wear on the mixing valve, originating from horizontal or vertical movements of the machine, shall be eliminated.
e) Subject the mixing valve to 70 000 cycles of opening and closing, each cycle comprising opening and closing movements as described below and illustrated in 0 and 0:
1) For rectangular movements:
1. start in mean mixed closed position;
2. open in mean mixed position;
3. return to closed position;
4. move to cold water position (position 3);
5. open in cold water position (position 4);
6. move to full open hot water position (position 5), then dwell for 5 s;
7. move to cold water position (position 6), then dwell for 5 s;
8. close in cold water position (position 7);
9. move to closed hot water position (position 8);
10. open in hot water position (position 9), then close (position10);
11. return to position 0.
2) For triangular movements:
1. start in mean mixed closed position;
2. open in mean mixed position;
3. return to closed position;
4. open in full cold water position;
5. move to full hot water position, then dwell for 5 s;
6. move to full cold water position, then dwell for 5 s;
7. return to mixed closed position (position 6);
8. open in full hot water position;
9. close, return to position 0.
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3) For dual control subject each control device to the relevant part of the rectangular movement series of tests.
Key F applied force in N D radius of control lever in mm r effective radius of control lever in mm
M moment in Nm : M Nm 3 D/1000 ≤×= F
M1 moment in Nm : M1 Nm 3 r/1000 ≤×= F
Figure 14 — Test bench adjustment torque for
conventionnal mixing valve
Figure 15 — Test bench adjustment torque for joystick
mixing valve
Figure 16 — Test bench adjustment torque for sequential
mixing valve
EXAMPLES
1 If D = 100 mm, then F has to be 30 N .
2 If D = 50 mm, then F has to be 60 N .
NOTE The keys of Figures 14 to 16 are independent of those of Figures 11.
12.1.3 Requirements
During the test, no component fracture, sticking or leakage shall occur.
The operating torque for flow rate adjustment and temperature adjustment shall not exceed 3 Nm during the test.
Verify that, after 70 000 cycles, the leaktightness requirements of 8.3, 8.4 and 8.7 are still satisfied.
During the test, record any incidents: failure of leaktightness – leakage in the assembly - fracture of components - stoppage of machine due to control difficulties - etc.
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12.2 Mechanical endurance of diverters
12.2.1 General
This clause describes two methods, one for manual diverters and one for diverters with automatic return that shall be carried out to evaluate the mechanical endurance of diverters of mechanical mixing valves, and specifies the test criteria.
12.2.2 Test method
12.2.2.1 Principle
The diverter is subjected to a specified number of operations whilst being supplied alternately with cold water and with hot water to test its behaviour over a period of time, taking into account the effect of water temperature.
12.2.2.2 Apparatus
For manual diverter, an automatic machine that ensures alternate operations at the rate of (15 0 1− ) cycles per
minute and supply circuits with a pump or similar device to supply the required cold water static pressure at a temperature of ≤ 30 °C and the required hot water static pressure at a temperature of (65 ± 2) °C.
For diverter with automatic return, a mechanism for moving the diverter to the shower position under the conditions specified in 8.6 and supply circuits identical to those specified above with, in addition, an automatic quick-acting valve to cut off the supply to the mixing valve under test.
12.2.3 Procedure
For manual diverter:
a) install the mixing valve, as supplied, on the test rig and connect both inlets to both supply circuits;
b) connect the drive device to the diverter operating member by means of a flexible component;
c) adjust the static water pressure of both hot and cold circuits to (0,4 ± 0,05) MPa [(4 ± 0,5) bar];
d) in the flow-to-bath and flow-to-shower mode, adjust the flow rate to (6 ± 1) l/min by restricting the outlet;
e) subject the diverter to a test of 30 000 cycles, each comprising a return movement between the extreme positions; throughout the test, supply the mixing valve alternately at both inlets with cold water for (15 ± 1) min, then hot water for (15 ± 1) min.
For diverter with automatic return:
a) install the mixing valve, as supplied, on the test rig and connect both inlets to both supply circuits;
b) connect the drive device to the diverter operating member by means of a flexible component;
c) adjust the static pressure of both hot and cold circuits to (0,4 ± 0,05) MPa [(4 ± 0,5) bar];
d) in the flow-to-bath and flow-to-shower mode, adjust the flow rate to (6 ± 1) l/min by restricting the outlet;
e) subject the diverter to a test of 30 000 cycles, one cycle being defined as follows:
1) with the diverter in the “flow to bath” position, allow water to flow through the spout for (5 ± 0,5) s;
2) move the diverter to the shower position;
3) allow water to flow through the shower outlet for (5 ± 0,5) s;
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4) use the quick-acting valve to cut off the supply to the mixing valve, allowing the diverter to return to the “flow to bath” position, and then reopen the supply.
Throughout the test, supply the mixing valve alternately at both inlets with cold water for (15 ± 1) min and then hot water for (15 ± 1) min.
12.2.4 Requirements
Throughout the test, there shall be no incidents of leaks, failure of diverter to reset, blockage, etc.
On completion of 30 000 cycles, the assembly shall be leaktight when tested according to 8.5 for manual diverters or 8.6 for diverters with automatic return.
Table 13 — Summary of test conditions for diverters
Field of application Conditions
Supply system
Pressure of: Cold and hot water
(0,4 + 0,05) MPa
[(4,0 + 0,5) bar]
Cold water temperature ≤ 30 °C
Hot water temperature (65 ± 2) °C
Timing of supply: Cold or hot water
(15 ± 1) min
Time of flow: to bath or to shower outlet
(5 ± 0,5) s
Flow rate to bath and to shower outlet (6 ± 1) l/min
Operation rate for manual diverters (cycles)
(15 ± 1) min-1
Backflow prevention See Clause 13
Number of cycles 30 000
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12.3 Mechanical endurance of swivel spouts
12.3.1 General
This clause describes a method that shall be carried out to test the mechanical endurance of swivel spouts of mixing valves and specifies the corresponding test criteria.
12.3.2 Test method
12.3.2.1 Principle
The principle of the test is to reciprocate the spout of the mixing valve with both inlets fed with cold water for a specified number of cycles in order to test its behaviour over a period of time.
12.3.2.2 Apparatus
Automatic machine, capable of swivelling the spout as described in 12.3.3 and 12.3.4 at a rate of (15 ± 1) cycles per minute;
cold water supply circuit with water at a temperature of ≤ 30 ˚C with a pump or a similar device, for supplying the required pressure;
mass of (1 ± 0,1) kg if the spout is ≤ 200 mm , or sufficient to apply a bending moment of (2 ± 0,25) Nm if the spout is > 200 mm.
12.3.3 Procedure
a) Mount the mixing valve on the machine and connect the inlet(s) to the supply circuit;
b) with the mixing valve closed, adjust the static water pressure to (0,4 ± 0,05) MPa [(4 ± 0,5) bar];
c) open the mixing valve fully and adjust the flow rate to (6 ± 1) l/min by restricting the nozzle outlet;
d) subject the spout to a test of 80 000 cycles, each cycle comprising a movement of the spout through an arc of 120° in both directions or, if there is a stop, over 90 % of the available travel.
12.3.4 Requirements
During the test there shall be:
no deformation or fracture of the swivel spout;
no deformation or fracture of the device connecting the spout to the body;
no leakage of the assembly.
At the end of the test, the spout shall be leaktight under the conditions given in 8.4.
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13 Backflow protection
Backflow protection shall be provided using appropriate devices referenced in EN 1717.
14 Acoustic characteristics
14.1 General
This clause specifies the test method that shall be carried out to classify mixing valves by acoustic group and, in appropriate cases, by flow class.
NOTE The use of mechanical mixing valve without acoustical group I or II is not precluded where no acoustical group is required.
14.2 Procedure
The method of measurement shall be in accordance with EN ISO 3822-1 under the conditions specified in EN ISO 3822-2.
14.3 Requirements
14.3.1 Flow rate class of mechanical mixing valves
Mechanical mixing valves with provision for connecting interchangeable outlet accessories such as flow rate regulators, shower, flow straightener, etc. having been tested with a low-noise flow resistance in accordance with EN ISO 3822-4 are allocated a corresponding flow class as shown in 0.
14.3.2 Flow rate class of mixing valves without provision for connecting accessories
Mechanical mixing valves without provision for connecting interchangeable outlet accessories or water saving accessories are tested as supplied and the flow rate obtained at the test pressure of (0,3 ± 0,02) MPa [(3,0 ± 0,2) bar] is reported.
14.3.3 Correspondence between flow rate classes and measurements
Hydraulic resistances are defined in classes (EN ISO 3822-4) as a function of their calibrated flow rate at (0,3 ± 0,02) MPa [(3,0 ± 0,2) bar] (see 0; see also EN 246).
Table 14 — Flow rate classes (EN ISO 3822-4:1997, Annex A)
Flow rate
class
Flow rate
(l/s)
Z 0,15
A 0,25
S 0,33
B 0,42
C 0,50
D 0,63
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14.3.4 Expression of results
The results of the measurements taken in accordance with EN ISO 3822-1 shall be expressed by the noise emission of the tapware Lap in dB(A).
14.3.5 Determination of acoustic group
The acoustic group is determined by the value of Lap obtained at a flow pressure of 0,3 MPa (3 bar). The mixing valve is classified in acoustic group I, II or U as shown in 0.
Table 15 — Acoustic group
Group Lap in dB(A)
I ≤ 20
II 20 < Lap ≤ 30
U (unclassified) > 30
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Annex A (normative)
Apparatus
A.1 Apparatus
This comprises:
two supply circuits (hot water and cold water) (Figure A.1);
one test circuit (Figure A.2).
A.1.1 Supply circuits
Key 1 pressure regulator 2 piping 3 flow rate measurement 4 cold water 5 hot water 6 sample under test
Figure A.1 — Supply circuits
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Each circuit comprises:
a) a temperature regulating device (not shown) for adjusting:
1) the temperature of the cold water to a value of (10 to 15) °C;
2) the temperature of the hot water to a value between (60 to 65) °C;
b) a device (1) for obtaining the required pressures;
c) piping (2) of appropriate cross-section for the flow to be obtained;
d) a device (3) for measuring the flow rate.
A.1.2 Test circuit
Each hot water or cold water supply to the mixing valve comprises:
a) piping made from a rigid metal tube of diameter and length in accordance with the dimensions in Table A.1. and Figure A.2 comprising:
1) a device for connecting this piping to the supply circuit;
2) a pressure take off tee;
3) a temperature probe;
4) a connection to the reinforced flexible pipe;
b) a reinforced flexible pipe, 500 mm long, of minimum internal diameter equal to that of the metal tube, with a device at the end for connection to the mixing valve;
c) a temperature probe for measuring the temperature of the water at the mixing valve outlet;
d) a device without backlash for automatic or non-automatic operation at a rate of approximately 0,5 °angular/s or 8 mm/s of the temperature and flow rate control device(s) of the mixing valve;
e) equipment for measuring:
1) pressures (measurement accuracy ± 1 % of the measured values);
2) flow rates (measurement accuracy ± 2 % of the measured values);
3) temperatures (measurement accuracy ± 1 K of the measured values);
4) movement (measurement accuracy of ± 0,5 mm or ± 0,5° angular of the measured values).
NOTE The various parameters QC, QH, QM and G may be recorded continuously
where
QC is the flow of cold water;
QH is the flow of hot water;
QM is the flow of mixed water.
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Table A.1 — Connecting dimension
Connecting dimension of the mixing valve
Internal diametermm
Union nut
½
¾
min. 13
min. 20
G ½
G ¾
Dimensions in millimetres
Key 1 connection to supply circuit 2 metal tube 3 pressure tapping 4 temperature probe 5 connection 6 hot water 7 mixed water temperature probe 8 cold water
Figure A.2 — Test circuit
A.1.3 Pressure take off tees
Pressure take off tees shall be of the individual pressure tapping type or the annular slit type (see Annex B).
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A.2 Mounting of the mixing valve
Depending on the type of mixing valve, one of the following mounting arrangements shall be used:
Key 1 flexible tube
Figure A.3 — Mounting of the mixing valve
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Annex B (informative)
Pressure take-off tee
Dimensions in millimetres
Key 1 hex. or spanner flats 2 both ends conforming to type A, EN 1254-2 NOTE Unspecified tolerances are ± 1.
Figure B.1 — Pressure take-off tee
Table B.1 — Dimensions of the pressure take-off tee
Dimensions of the pressure take off tee
A B C E F J K L Screws Nominal size of tap
max. min. max. min. max. min. max. min. Max. min.
M
No Size
½ 15,25 15,15 26 25 13,95 13,80 40 4 37 0,7 0,6 19 18 5,5 4 M4 x 15
¾ 22,30 22,20 36 35 20,75 20,50 50 4 47 0,8 0,6 26 25 9,0
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Figure B.2— Schematic examples of pressure take-off tees
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Recommendation for the design of pressure take-off tees:
Figure B.2 shows three examples of pressure take-off tees giving equivalent results:
a) individual: types A and B;
b) annular slit: type C.
Requirements relating to the design and manufacture of pressure take-off tees are given in EN ISO 5167-1.
The main principles are:
a) Individual type:
1) The axis of the pressure orifices shall intersect the axis of the piping (or the casing) and be perpendicular to it; the opening of the orifice shall be circular and the edges flush with the wall of the piping (or the casing) with an angle as sharp as possible. Slight rounding at entry is permitted (radius ≤ 1/10 diameter of the pressure orifice).
2) The diameter of the pressure orifice shall be less than 0,1 D (D; internal diameter of the tube or casing).
3) There shall be an even number (at least 4) of the pressure orifices. The angles formed by the arcs of the pressure orifices shall be approximately equal.
4) The area of the free cross section of the annular chamber of the casing shall be greater than or equal to the half total area of the orifices connecting the chamber to the piping.
b) Annular slit:
1) The thickness f of the annular slit shall be equal to or greater than twice the width i of the slit.
2) The area of the free section of the annular chamber should be equal to or greater than half the total area of the annular slit connecting the chamber to the piping.
3) All surfaces coming into contact with the fluid measured shall be clean and well finished.
4) The width of the annular slit shall be nominally 1 mm.
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Bibliography
[1] EN 1254-2, Copper and copper alloys — Plumbing fittings — Part 2: Fittings with compression ends for use with copper tubes
[2] EN 1286, Sanitary tapware — Low pressure mechanical mixing valves — General technical specification
[3] EN ISO 5167-1:2003, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 1: General principles and requirements (ISO 5167-1:2003)
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