FRV -20 Metric U.S.

Field ScaleSetting Ib/mingpm

EquivTonskg/min3m /h

Equiv.KW

5 17.5 0.065 0.8 5 0.3 1.7

10 34.9 0.14 1.6 10 0.6 3.4

20 69.9 0.27 3.1 20 1.2 6.8

30 105.0 0.41 4.7 30 1.8 10.2

40 140.0 0.54 6.3 40 2.4 13.6

50 175.0 0.68 7.9 50 3.0 17.0

60 210.0 0.82 9.5 60 3.6 20.4

TYPE FRV FOR LIQUID OVERFEED (RECIRCULATING) SYSTEMS:

AUTOMATIC LIQUID FLOW REGULATOR

Application and Selection GuideFRV For use with R717 onlyFUNCTION - To maintain a constant, but adjustable flow rate and to act as a check valve. Has flanged connections

TYPICAL APPLICATION - Maintain constant flow rate of liquid to an evaporator on a ammonia overfeed (recirculating) system. Also to serve as check valve during hot gas defrost. Not recommended if liquid is substantially warmer than the evaporator temperature.

DESCRIPTION:

This precision built, heavy duty, self-contained, iron bodied Automatic Flow Regulator, is used as a liquid control device for Ammonia Overfeed Systems. This Automatic Flow Regulator, once set, maintains a constant flow rate of liquid to the evaporator. It also serves as a check valve to prevent back flow into the liquid line from the evaporator during pressure reversals which occur during hot gas defrost.

APPLICATION NOTE:An FPR flow regulator is designed to maintain an approximately constant liquid refrigerant delivery rate into the evaporator. However, it is not an expansion device capable of controlling vapor or two phase flow. Design conditions which allow for the formation of flash gas as liquid flows through the regulator can cause the FFR to chatter and result in irregular liquid delivery. This feed device should be applied only where sufficient liquid subcooling exists to ensure that its outlet pressure will never be reduced to less than the liquid's saturation vapor pressure. AFR's are not recommended for application in gas displacement systems or where controlled pressure receivers deliver liquid to the evaporators.

SELECTION INFORMATION:This single AFR-3 Regulator can be adjusted to maintain a constant flow rate from 0.3 gpm to 3.6 gpm of liquid ammonia at pressure drops from 5 psi to 60 psi. This is equivalent to a refrigeration effect range from 5.0 tons to 60

FRV Capacities: (Not recommended for halocarbon refrigerants)Note : R-717 liquid density correction is not necessary.

FOR HIGHER CAPACITY REQUIREMENTS, FRV32, FRV40, FRV50 are available. The capacity table is as below.

Model Capacity in TR(Recirculation Rate 1 : 1)

FRV 20 60

FRV 32 120

FRV 40 240

FRV 50 480

FOR MECHANICAL PUMPED (AMMONIA) LIQUID OVERFEED SYSTEMS:

FEATURES: wExternal Adjustment wEasy Setting Scale wEliminates System Balancing wIntegral Check Valve w"Frost Free" Neck wDesign Pressure (MRP): 27.6 bar (400 psig)

54

FRV

57

CONSTANT PRESSURE VALVE, TYPE SCVMD

INTRODUCTION SCVMD is a constant pressure regulator for refrigeration and freezing plant in applications such as;Hot gas defrosting (drain lines) Refrigerant pump bypass(to ensure min. flow in refrigerant pumps).

RefrigerantsR 717, R 22, R 134a, R 404A, R 407C etc.Range: 0 7 barMax. working pressure PB = 28 barTest pressure p' = 36 bar

TECHNICAL DATA Temperature range: -50 to120°C

3k value: 1.5 m /hv3The k value is the flow of water in m /hv

3at a pressure drop across valve of 1 bar, = 1000 kg/m .

ORDERING SCVMD incl. 1/2 in. weld flange,

CONSTRUCTION

DIMENSIONS AND WEIGHTMaterials Gaskets are non asbestos Valve housing made of GGG 40.3

1. Protection cap2. O-ring3. Spindle4. Gasket5. Cover6. Spring7. Screw8. Diaphragm9. Gasket17. Flanges

Based on: Power = 1, kv = 1.5 m3/hDefrost capacity (kW) = 2.5 QevaporatorUse SPM + SCVP (HP) valves for higher capacities.

The figure shows the low pressure side of an R 717 refrigeration plant with flooded evaporator with pump circulation.In this application, the constant pressure valve, type SCVMD, is mounted as a pressure regulator in the bypass line between evaporator and downstream wet suction line after the solenoid valve, type SPMLX.The SCVMD can be used in this application for evaporators with capacities up to:

Pos. A on the drawing is the pilot line from the high pressure side to SPMLX.Pos. B is the liquid/gas return line.Pos. C is the liquid line to the evaporator.Pos. D is the hot gas line for hot gas defrosting of the evaporator.

Example

SCVMD

SNRVA

SVRA

SVRAT

TA

TA

TA

SCVMD

FRV

SNRVA

Hot gas defrosting of evaporator with pump circulation

SPMLX

63

QDV is a quick closing oil drain valve, designed particularly for draining oil from systems containing refrigerant (ammonia) under pressure. The valve will close immediately on release of the handle, thus protecting user and environment against unnecessary refrigerant leaks. The valve should as a rule be installed as illustrated in fig.1.

In order to prevent hydraulic pressure building up between the stop valve and the QDV an integral relief device is included as part of the cone arrangement, which will open at approx. 5 bar g (363 psig).QDV is designed to meet the safety demands specifed by national and international authorities within industrial refrigeration.

FeaturesQDV is generaly used with R717 (ammonia) but the valve is also applicable to all other common non fammable refrigerants and non corrosive gases/liquids dependent on sealing material compatibility

Meets the safety demands within industrial refrigeration

Handle can be positioned 360°

Built-in integral relief device opening over 5 bar g (proventing hydraulic pressure building up between stop valve and QDV).

Can be supplied together with a stop valve for quick on site mounting

Max. operating pressure: 40 bar g (580 psi g).

Temperature range: –50/+150°C (–58/+30°F).

Classifcation: To get an updated list of certifcation on the products please contact your local Danfoss Sales Company.

QUICK CLOSING OIL DRAIN VALVE, TYPE QDV 15

INTRODUCTION

INTRODUCTION:

SFV-15 is standard, back pressure dependent safety relief valves in angle-way execution, specially designed for protection of vessels and other components against excessive pressure.

The valve is designed to meet the strict quality demands and safety requirements for refrigeration installations, specified by the international classification societies.

The valve is recommended as an external and internal safety relief valve in refrigeration plants. The spring housing is closed tightly to avoid refrigerant leakage.

The inlet flow diameter of the valve is:13 mm (1/2 in.) for SFV 15,

The valve can be supplied with set pressures between 10 and 25-bar g (145 and 363 psi g). Valves can also be supplied with non-standard set pressures between 10 to 25-bar g (145 to 363 psi g) in 0.5 bar g(7.25 psi g) increments, to suit the customers's specific requirements.

Dual manifold is also available.

TECHNICAL DATA:

REFRIGERANTS:

Applicable for the refrigerants R 717 (ammonia,NH3), HFC,HCFC (e.g. R 22, R 134a, R 404a) and other refrigerants dependent on sealing material compatibility within a temperature range of 30°C/+ 100°C (22°F/+212°F).Flammable hydrocarbons are not recommended.

PRESSURE:

Pressure setting range:10 - 25 bar g (145 - 363 psi g),The valve is designed for: Strength test: 50 bar g (725 psi g)Leakage safety: Same as set pressure

IMPORTANT: The SFV safety relief valve is dependent on the back pressure (if the back pressure is higher than the atmospheric pressure, the opening pressure will be higher than stated set pressure).

Special circumstances such as vibration (which should be avoided) and oscillating pressure may require an increased difference between the operational pressure and the closing pressure.

PRESSURE SETTING:

The operating pressure of the plant should be at least 15% below the set pressure. This allows a perfect re-seating of the safety relief valve after having been activated.

TEMPERATURE RANGE: 30/+100°C (22/+212°F)

Design

SAFETY RELIEF VALVES TYPE SFV-15

60

SAFETY VALVE

SAFETY VALVEWITH

DUAL MANIFOLD

CHECK VALVES FOR AMMONIA AND FLUORINATED REFRIGERANTS TYPE SNRVA

FEATURES:

Ensures correct direction of flow.

Valve housing made of steel.

Available for 40 bar g (580 psig) working pressure.

Large range of flanges with connection dimensions in accordance with standards: DIN, ANSI, SOC, SA and FPT.

Fitted with damping piston that makes the valves suitable for installation in lines where pulsation can occur, e.g. in the discharge line from the compressor.

TECHNICAL DATA:Refrigerants: Can be used for all normal, non-flammable refrigerants, including R 717, and non-corrosive gases/liquids - assuming seals of the correct material are used.For further information please see installation instruction for SNRVA.

Use with flammable hydrocarbons cannot be recommended; please contact Manik Engineers.

GASKETS:Do not contain asbestos.

VALVE CONE:The valve cone has a teflon tightening ring. Teflon tightening ring renders perfect sealing at a minimum closing force.

Temperature range: –50°C / +140°C (–58°F / +284°F).

Pressure range: The valve is designed for: Max. working pressure: 40 bar g (580 psig).

INTRODUCTION:Check valve type SNRVA can be used in liquid, suction and hot gas lines in refrigeration and air conditioning plant with ammonia. SNRVA can also be used in refrigerating systems with fluorinated refrigerants.

When the SNRVA is used in liquid lines where cold, thick oil or impurities may be present, it is recommended that the standard spring be replaced by a special spring. See ordering table.

Solder connection, DIN (2856)

Solder connection, ANSI (B 16.22)

FPT internal thread, NPT (ANSI/ASME B 1.20.1)

58

SNRVA 15

SNRVA 40/50

SNRVA 65/80

66

Overflow valves, type OFV 20 - 25

Introduction

Features

OFV are angle-way over flow valves, which have ajustable opening pressure and cover the differential pressure range (∆P): 2 - 8 bar (29 - 116 psi). The valve can be closed manually, e.g. during plant service and have backseating, enabling the spindle seal to be replaced with the valve still under pressure.

The valves are especially designed to prevent fluttering due to low velocity and/or low density. In consequence it is possible to apply the valves with wide fluctuations incapacity demands, i.e. from maximum performance to part load. A flexible O-ring provides perfect sealing over the seat.

Applicable to all common non flammable refrigerants including R717 and non corrosive gases/liquids dependent on sealing material compatability.

Full temperature range packing gland –50/+150°C (–58/+302°F)

Maximum operating pressure:40 bar g (580 psi g)

Three functions in one valve. The OFV valve combines the functions of an overflow valve, a check valve and a stop valve

DESIGN

ConnectionsAvailable with the following connections:

Welding DIN (2448)Welding ANSI (B 36.10 Schedule 80)

PACKING GLANDThe “full temperature range” packing gland consists of a double O-ring sealing arrangement combined with permanent lubrication from a grease reservoir. This ensures perfect tightness throughout the whole range: –50/+150°C (–58/+302°F). Flexible O-ring provides perfect sealing over the seat.

INSTALLATIONThe valve is designed to resist very high internal pressure, but as to the pipe system in general, hydraulic pressure caused by thermal expansions in entrapped refrigerants should be avoided. For further informationplease see OFV installation instruction.

TECHNICAL DATA

RefrigerantsApplicable for all refrigerants and non corrosive gases / liquids, dependent on sealing material combability. Flammable hydrocarbons are not recommended. For further information please contact Manik Engineers.

Temperature range–50/+150°C (–58/+302°F)

Pressure rangeThe valve is designed for:Maximum operating pressure: 40 bar g (580 psi g). Valves for higher working pressure are available on request.

∆Set pressure ( p): 2 - 8 bar (29 - 116 psi).