Fire Protection Div.

Dorot Fire Protection Division

Pressure Regulating Valves

Pressure Regulating Valves

Certification & compliance by design

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200-195D 20M/11/97

Model 30 PR\ UL

Pressure Reducing Valve

• ANSI FCI 70-2 Class VI seat leakage class • UL listed under VLMT category • Lloyd's type approval

Designed for• Regulating downstream pressure

regardless of upstream pressure and flow fluctuations

• Listed pressure rating up to PN25/375psi• Stable regulation from very low to high-flow

rates• Industrial, commercial & building fire suppression

Features• Superior design featuring low pressure losses at

high flow rates• Stable regulation from near zero flow to maximum

design flow• The PR\UL valve regulates at low flow and high

pressure differential without bypass or U port design• Low lifelong maintenance costs thanks to its unique

frictionless internal-trim design (floating-shaft design)

• Stainless Steel seat as standard• Simple field-adjustable pressure setting, requiring

no special tools and with no system downtime• Fresh or brackish water, seawater and foam systems• Out of the box fully assembled & tested valves• All valve control ports are stainless steel sleeved

CF8M or higher for improved corrosion protection• 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

Flanged

Grooved

Fire suppression systems

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Pressure Regulating Valves

Model 30 PR\ULFire Protection Div.

General description

Dorot Series 300 valves are automatic, hydraulically actuated, diaphragm operated, globe and angle pattern 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 internal trim assembly.

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Operation modes

30-PR\UL Unique designThe Dorot valve model 30-PR\UL is a pilot-controlled, pressure-reducing valve, actuated by the pipeline pressure.The valve accurately regulates to a steady preset downstream pressure, down to near-zero flow rates, regardless of upstream pressure fluctuations and valve-size. In case of excessive downstream pressure, the valve closes drip tight.The valve’s unique design eliminates the need for a special low flow plug-design (such as V or U-ports), or the installation of additional smaller-sized bypass valves.The valve’s low-friction internal-trim design utilizes an LTP® (Linear Throttling Plug) guide and a pre-shaped reinforced diaphragm. The standard and simple single-chamber valve allows easier assembly, improved longevity and reduces periodic inspections and maintenance. When required, maintenance is easily done on-site and in-line.

Design considerations• The valve should be suited to the maximal designed flow and allowed head loss.• For added safety, installing a downstream pressure relief valve (30-PS\UL, 77-PS\UL or 44-PS\UL) is highly

recommended as common market practice.• Large pressure differentials may cause cavitation damage. Consult Dorot for unique solutions if such

conditions are expected.

Regulating position

30-PR

PG

PG

PG

Closed position

Water To System

0 1 2

3 4 5 6

7 8

9

PRV

30-PR

PG

PG

PG

*Optional Y-type strainer

Water

0 1 2

3 4 5 6

7 8

9

PRV

*

*

Pressure Regulating Valves

Model 30 PR\UL

3

1

2

4

Grooved

Flanged

Typical control trim materials

ID Description Standard POG (1) Applications

1 Dorot valve body See Series 300 Engineering data (2)

2 Inline control strainer Brass \ SST screen SST316

3 Pressure gauge Brass case \ SST connection SST316

4 Pressure reducing pilot Brass \ SST316 seat SST316

5 Position Indicator 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

3

5

Pressure Regulating Valves

Model 30 PR\ULFire Protection Div.

Valve 2 (50) 21/2 (65) 3 (80) 4 (100) 6 (150) 8 (200) 10 (250) 12 (300)inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm

A 91/8 230 113/16 290 123/16 310 1313/16 350 187/8 480 235/8 600 2813/16 730 331/2 850AG 81/2 215 81/2 215 1313/16 350 1413/16 376 201/2 520 N/A N/A N/A N/A N/A N/AB 61/8 155 61/8 155 61/8 155 67/8 175 91/2 240 1113/16 300 143/8 365 1611/16 425C 77/8 200 77/8 200 93/16 234.5 10 253.5 117/8 301 131/2 342.5 1511/16 399.5 173/16 436D 35/16 82.5 35/8 92.5 37/8 100 45/16 110 55/8 142.5 613/16 172.5 81/8 205 91/8 230E 95/16 236 95/16 236 115/8 295 121/8 307 153/8 390 1713/16 452 221/2 572 265/16 668

Approx. Weight

Ibs kg Ibs kg Ibs kg Ibs kg Ibs kg Ibs kg Ibs kg Ibs kg26 12 29 13 49 22 82 37 176 80 346 157 540 245 893 405

* Approximate dimensions

4 Flanged Grooved

General arrangement and valve dimensions

CONTROL VALVES

C

D

A

E

B

CONTROL VALVES

AG

CONTROL VALVES

C

D

A

E

B

Pressure Regulating Valves

Model 30 PR\ULFire Protection Div.

5

Typical system layoutPressure reducing station layout including downstream pressure relief valve

15

2

3

4

1

1

5

5

2

3

4

4

Optional system layout for redundacySimilar to the typical installation - while providing extra redundancy and zero downtime during inspection and maintenance times

1

Dorot 30-PR\UL Pressure Reducing valve

1

3

2

4

5

Pressure gauge

Isolation valve

Strainer

Recommended Dorot models 44, 77 or 30 Pressure Relief valve

Pressure Regulating Valves

Model 30 PR\ULFire Protection Div.

30 I SS - 3 - AN15RF - PR\UL - S -

Model 30 30 Optional add-on

Optional add-on PI Pressure switch

Position Indicator I LS Limit-proximity switch

Material Trim

Ductile Iron Brass-Copper

Cast Steel CS S Stainless Steel 316

CF8M (SST316) SS X Other

Ni-Al-Br NAB Control function

Size (inch) 2”-40” End connection standard

AN15RF ANSI #150 (FF or RF)

AN30RF ANSI #300 (FF or RF)

GRV Grooved

ISO PN16 ISO PN16

ISO PN25 ISO PN25

xxx Other (specify)

Ordering guide

The Pressure Reducing Valve shall be UL Listed for Special System Water Control Valves, Pressure-reducing and Pressure-control Type (VLMT).The valve shall maintain a constant predetermined downstream pressure regardless of fluctuations in upstream pressure or flow.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. No by-passes or 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 fabric reinforced rubber diaphragm elastic & resilient through its entire surface without vulcanized radial discs. The seat shall be stainless-steel and interchangeable.The Valve will be factory trimmed, tested and calibrated to downstream pressure of 165 psi as UL standard or other pressure setting up to 360 psi (2”- 8”) or 285 psi (10”- 12”). 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 as Ductile Iron ASTM A-536 65-45-12 and/or Cast Steel WCB A-216 should be coated by high built fusion bonded epoxy (FBE) with an external polyester/polyurethane UV protective topcoat conforming to corrosion protection standard EN12944 C4-C5 & C5M grades. Other valve materials as austenitic Stainless steel s, Nickel Aluminum Bronze ASTM B-148 can be coated with specific coatings.

Ed

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n 0

1.20

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6Dorot & Dorot companies worldwide reserve the right to make changes without notice including product specification and configuration, content, description(s), dimensions etc. The Information herein is subject to change without notice. Dorot shall not be held liable for any errors. All rights reserved. © Copyright by Dorot.

Ordering example: 30ISS-3-AN15RF-PR\UL-S

Technical data:• Media up to 80°C = 176°F• Elastomers suitable for extreme climates are

available upon request.

UL listed sizes:• Flanged: 2” - 6”

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

• Grooved

Pressure rating:• 250 psi for Class #150• 375 psi for Class #300• Minimum system pressure 1.5 bar / 22 psi

UL listed downstream pressure setting range:• 2” - 6”: 30 - 165 psi

Other certified (non UL) downstream pressure setting range:• 2” - 8”: 30 - 360 psi• 10” - 12”: 30 - 285 psi

Please specify in addition to the above:• Control trim material other than standard • Required standards, certifications and approval

* Please refer to 300 Series Engineering Data and PR\UL IOM for hydraulic data and hydraulic graphs

Specification for engineers

Dorot Control Valves www.dorot.come-mail: fp@dorot.com