Fire Protection Div. Dorot Fire Protection Division Pressure Regulating Valves Pressure Regulating Valves Certification & compliance by design Models 44, 77 & 68 PS\ UL Pressure Relief Valve • ANSI FCI 70-2 Class VI seat leakage class • Fire tested to EN ISO 6182-5:2006 • UL listed under QXZQ category • Lloyd's type approval Designed for • Maintaining a steady preset system pressure, regardless of fluctuating supply • Automatically relieving over-pressure, should upstream pressure exceed the required set point • Protecting the system by accurately limiting maximum pressure • High flows and working pressures (up to PN25/375psi) • Industrial, commercial & building fire suppression Features • Superior design featuring exceptionally low pressure losses at high flow rates. • Low lifelong maintenance costs thanks to its simple internal trim design • Simple, comprised of 3 main parts, no expertise required for maintenance • Simple field-adjustable pressure setting, requiring no special tools and with no system downtime • Fresh or brackish water, seawater and foam • Out of the box fully assembled & tested valves. • Extensive valve & trim materials selection and corrosion protection coating to EN12944 C4,C5 & C5M Typical applications Power Generation, Transformer & Transmission Plants Tunnels Petrochemical, Oil & Gas Installations Onshore-offshore Mining Pumps and water tanks Fire suppression systems 77-PS\UL 44-PS\UL 1
Transcript
Fire Protection Div.
Dorot Fire Protection Division
Pressure Regulating Valves
Pressure Regulating Valves
Certification & compliance by design
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The minimum height of the registered trademark symbol ® shall be 3/64 of an inch. When the overall diameter of the UL Mark is less than 3/8 of an inch, the trademark symbol may be omitted if it is not legible to the naked eye.
The font for all letter forms is Helvetica Condensed Black, except for the trademark symbol ®, which isHelvetica Condensed Medium. No other fonts are acceptable.
Please Note:The word "MARINE" should only be used for UL Classified marine products.
200-195D 20M/11/97
Models 44, 77 & 68 PS\ UL
Pressure Relief Valve
• ANSI FCI 70-2 Class VI seat leakage class • Fire tested to EN ISO 6182-5:2006• UL listed under QXZQ category • Lloyd's type approval
Designed for• Maintaining a steady preset system pressure,
regardless of fluctuating supply• Automatically relieving over-pressure, should
upstream pressure exceed the required set point• Protecting the system by accurately limiting
maximum pressure• High flows and working pressures (up to
PN25/375psi)• Industrial, commercial & building fire suppression
Features• Superior design featuring exceptionally low
pressure losses at high flow rates.• Low lifelong maintenance costs thanks to its
simple internal trim design• Simple, comprised of 3 main parts, no expertise
required for maintenance• Simple field-adjustable pressure setting, requiring
no special tools and with no system downtime• Fresh or brackish water, seawater and foam• Out of the box fully assembled & tested valves.• Extensive valve & trim materials selection and
corrosion protection coating to EN12944 C4,C5 & C5M
Typical applications
Power Generation, Transformer & Transmission Plants
Tunnels
Petrochemical, Oil & Gas Installations
Onshore-offshore
Mining
Pumps and water tanks
Fire suppression systems
77-PS\UL
44-PS\UL
1
Pressure Regulating Valves
Models 44, 77 & 68 PS\ULFire Protection Div.
2
General description Dorot models 44, 77 & 68 valves are automatic, hydraulically actuated, diaphragm operated, globe/ weir-type control valves. The valves are designed for use in fire protection applications including deluge, pre-action, pressure control, water, foam and seawater fire protection systems. The valves consist of three major components: the body, the cover and the diaphragm assembly.
Operation modes
PS\UL Unique designThe Dorot valve model PS\UL is a pilot-controlled, pressure-relief valve, actuated by the pipeline pressure. The valve accurately maintains a set pipeline pressure regardless of pump start and stop conditions. The relief pressure can easily be set and modified by use of the adjustment bolt on the pressure relief pilot’s cover.When the pipeline pressure exceeds the required set point, the valve modulates to maintain a steady, predetermined pressure in the network. When pressure falls below the set value, the valve closes drip tight.The PS\UL’s trim contains an integral and adjustable needle valve which enables high pilot accuracy and control of the valve’s closing speed.The valve’s low-friction design utilizes a pre-shaped reinforced diaphragm and provides exceptionally low pressure losses at high flows and an accurate, stable control from no-flow to full flow conditions. The simple and reliable design allows easier assembly, improved longevity and reduces periodic inspections and maintenance. When required, maintenance is easily done on-site and in-line.
77,44,68-PS\UL
Fully Closed Position - 2"-3"
Pressure Relief - 2"-3"
Fully Closed Position - 4"-8"
Pressure Relief - 4"-8"
77,44,68-PS\UL
Fully Closed Position - 2"-3"
Pressure Relief - 2"-3"
Fully Closed Position - 4"-8"
Pressure Relief - 4"-8"
77,44,68-PS\UL
Fully Closed Position - 2"-3"
Pressure Relief - 2"-3"
Fully Closed Position - 4"-8"
Pressure Relief - 4"-8"
77,44,68-PS\UL
Fully Closed Position - 2"-3"
Pressure Relief - 2"-3"
Fully Closed Position - 4"-8"
Pressure Relief - 4"-8"
0 1 2
3 4 5 6
8
9
77 0 1 2
3 4 5 6
8
9
77
0 1 2
3 4 5 6
8
9
77
0 1 2
3 4 5 6
8
9
77
Water
Water
To drain, water tank or
sump Water
Water
Closed Position - 2"-3" Closed Position - 4"-8"
Pressure Relief - 2"-3" Pressure Relief - 4"-8"
To drain, water tank or
sump
Pressure Regulating Valves
Models 44, 77 & 68 PS\UL
3
1
2
3
4
51
2
3
4
5
47-(2-3)-PS
ID Description1 S-47 Control Valve2 Self Flushing Filter3 Pressure Gauge4 68-500 Relay Valve5 Check Valve
Typical control trim materials
ID Description Standard POG (1) Applications
1 Dorot valve body * See Series 100 Engineering data (2)
2 Inline control strainer Brass \ SST screen SST316
3 Pressure gauge Brass case \ SST connection SST316
4 Pressure relief pilot Brass SST316
5 Check valve Brass SST316
(1) Petrochemical, Oil & Gas(2) Refer to material selection guidelines,
Engineering Data - Materials:Ductile Iron A-536 65-45-12;Cast Steel A-216 WCB;Cast Steel A-352 LCB;Austenitic Stainless-Steel A-351/CF8M;Super Duplex 2507;Nickel-Aluminum-Bronze B-148 UNS C95800
*Illustration below using 3” model 77
Pressure Regulating Valves
Models 44, 77 & 68 PS\ULFire Protection Div.
Valve 2 (50) 3 (80) 4 (100) 6 (150) 8 (200)inch mm inch mm inch mm inch mm inch mm
Approx. WeightIbs kg Ibs kg Ibs kg Ibs kg Ibs kg31 14 75 34 93 42 174 79 280 127
* Approximate dimensions, shown for model 77-PS\UL
4
General arrangement and valve dimensions
CONTROL VALVES
C
A
F
DE
B
47-PS- 4"-6-8"
Pressure Regulating Valves
Models 44, 77 & 68 PS\ULFire Protection Div.
5
Typical system layoutPressure reducing station layout including downstream pressure relief valve
2
4
5
4
4
4
2
3
1
Fire pump station
1
Dorot 77-PS\UL pressure relief valve
Dorot 30-PR\UL pressure reducing valve
Pump
Isolation valve
Strainer
1
3
2
4
5
Pressure Regulating Valves
Models 44, 77 & 68 PS\ULFire Protection Div.
Ordering guide
The valve shall consist of three major components: the body, cover and the diaphragm assembly. The diaphragm shall be the only moving part. The diaphragm forms a sealed control chamber in the upper portion of the valve, separating operating pressure from line pressure. Packing glands’ stuffing boxes and dynamic o-ring seals are not permitted and there shall be no shafts, discs, bearings or pistons operating the main valve. No hourglass-shaped disc retainers shall be permitted and no V-type, U-type or other slotted type disc guides shall be used. The valve shall contain a nylon reinforced rubber diaphragm, elastic & resilient through its entire surface without vulcanized radial discs and/or reinforcements. The diaphragm shall not be guided by any shafts or bearings and shall not be in close contact with other valve parts except for its sealing surface. Maintenance, disassembly and reassembly of all the valve’s components shall be made possible on site and in-line, without the need to remove the valve from the line. The valve will be factory trimmed, tested and calibrated to a fixed relief pressure. Change of factory preset pressure setting can be done at all times, in-line with no special tools or system down time following simple IOM instructions. Standard material valves such as Ductile Iron (ASTM A-536 65-45-12) and Cast Steel (WCB A-216) should be coated with high-built fusion-bonded epoxy (FBE) and a UV protective topcoat conforming to EN12944 C4 & C5 high & very high corrosivity protection grades. Naval quality/very high corrosivity protection grade conforming to EN12944 C5M is available upon request. Other coating standards such as NORSOK or ANSI/NACE as well as coatings for special material valves such as austenitic Stainless Steel (CF8M/ASTM A-316 ) and Nickel Aluminum Bronze (ASTM B-148) can be supplied upon request.
Pressure rating:• 250 psi for Class #150• 375 psi for Class #300• Minimum system pressure 1.5 bar / 22 psi• UL listed pressure relief setting range: 2” - 8” up to 175 psi • Models 44 & 77: up to 16 bar / 230 psi• Model 68: up to 25 bar / 375 psi
Please specify in addition to the above:• Control trim material other than standard • Required standards, certifications and approval Standard- leave empty
* Please refer to 100 Series Engineering Data and PS\UL IOM for hydraulic data and hydraulic graphs
Ordering example: 77SS-3-AN15RF-PS\UL-S
Technical data:• Media up to 85°C = 185°F• Elastomers suitable for extreme climates are
available upon request.
UL listed sizes:• Model 77 (Flanged): 3” - 8”• Model 44 (Threaded): 2” - 3”
Lloyd’s type-approved sizes:• Model 68 (Flanged): 2” - 10”• Model 77 (Flanged): 2” - 24”• Model 44 (Threaded): 1” - 3”• ABS fire test applicable to model 68
End connections:• Flanged:
ISO PN10, ISO-PN16 & ISO-PN25 ANSI B16.42 Class 150, 300 AS Tables D & E, JIS Additional options available upon request
