EN ISO 9001Certif icate 041004422:

Rely son ufor safety of your

pressure vessel

Safety Relief ValveVSR1 - Steam and Non Poisoneous / Non Flammable Gases and Vapours

VSR2 - Gases,Vapours and Liquids

Full Lift, Spring Loaded, Safety Relief Valve

Model VSR1 Open Bonnet Type Safety Relief Valves are designed for Steam Boiler Service to meet the requirements of the Indian Boiler Regulations. These valves are suitable for Saturated & Superheated steam; Non Poisonous and Non inflammable Gases and Vapours.

Model VSR2 is a Closed Bonnet type Valve specially designed for Poisonous and Inflammable Gases, Vapours and Liquids.

These valves are available in 12 sizes as per API-526 Orifice sizes (EA-RA) and ANSI flanges covering set pressure ranging from 1.2 bar to 204 bar. A variety of materials are available to suit temperature range up to 550ºC.

NO. NAME MATERIAL

1 Nozzle *

2 Body *

3 Seat Zone X20CrMo171

4 Disc SS 431

5 Guide Piston SS 410

6 Guide Bush Cast Steel

7 Stem SS 410

8 Bonnet Carbon Steel

9 Bonnet Stud A 193B7

9.1 Bonnet Nut A 1942H

10 Spring 50CrV4

11 Adjusting Screw IS:320HT2

12 Lock Nut C20

13 Cap CS

14 Adjusting Ring (for VSR) SS 304

15 Cooling Spacer (SN 110) A216WCB

16 Cover SS 304

17 Plug C20

18 Ball SS

19 Dowel Pin SS

20 Split Ring 9S 20

21 Stop Bush SS 410

22 Distance Bush C20

23 Pressure Bush SS 410

24 Spring Stop A 216WCB

25 Spring Plate C20

26 Gasket Rubber Asbestos

28 Lock Nut SS

29 Split Pin C20

30 Bush SS 410

31 Fork MS

32 Square Shaft C20

33 Base Ring Sintered Iron

34 Packing P4

35 Gland CuZn40A/F60

36 Lever MS

37 Washer MS

38 Nut C20

40 Gasket Soft Iron

41 Cap Screw C20

42 Adjusting Ring Screw SS

Salient Features

4 Valve nozzle and inlet flanges are integral and of forged material to ensure safe operation at the highest pressure conditions.

4 The valve can therefore be offered in Flanged condition to DIN/BS/BS standards without any problem.

4Butt weld end connections at the valve inlet is possible.

4 Inlet / Outlet and valve body are deliberately oversized compared to the recommendations of API 526 to provide favourable flow characteristics and to keep flow velocities and dynamic pressure losses low.

4Complete range of Safety Valves are type tested for capacity.

4 Stem is precisely guided by a Piston which slides in the guide bush

4Piston and Guide Bush provide a large guiding area, which ensures concentric spindle loading and repeatability over extended period of time and numerous operations.

4Precisely wound Spring made from Chrome Vanadium Steel is specially designed to eliminate eccentric loading and to provide full relieving capacity.

4 Atmospheric cooling of spring and self-compensating thermal design ensures consistent spring compression rate resulting in repeatability of operation at varying temperature conditions.

4 All internal parts are made from corrosion resistant authentic materials with balanced thermal expansion coefficients.

4Provision of balanced Piston design eliminates the effects of backpressure and achieves low reseat pressure differences (blowdown). This ensures minimal steam wastage.

4 All valves are precisely set on pneumatic test bench and are tested for seat leakage as per API 527.

VSR1

29

12

28

25

8

10

7

24

23

22

21

20

9

11

9.1

16

6

5

18

19

4

3

2

1

13

3231

41

14

42

40,37

DrainG 1/4"only SKB A/B DN 40

VSR1with adjusting ring

CLOSED BONNET

Code 22 Code 23 Code 26 Code 27

Nozzle : A105 A182F22 A182 F304/316 A182 F316

Body : A216WCB A217WC6/WC9 A351 CF8/CF8M A216 WCB

Temp. Range ºC : upto 425 425 to 550 -195 to 300 -60 to 400

API 256 Orifice Code Letters, Smallest Flow Diameter (do) & (Ao)

Designation

do mm

2Ao mm

EA

24.5

471

FA

24.5

471

GA

24.5

471

HA

26.4

547

JA

33.8

897

KA

40.4

1282

LA

51.0

2043

MA

59.0

2734

NA

62.0

3019

PA

80.0

5027

QA

99.0

7699

RA

126.0

12467

OPEN BONNET

Materials for : Code 12 Code 13 Code 16 Code 17

Nozzle (*) : A105 A182F22 A182 F304/316 A182 F316

Body (*) : A216WCB A217WC6 A351 CF8 A216 WCB

Temp. Range ºC : upto 425 425 to 550 -195 to 300 -60 to 400

Material Specifications :

API 526 - Seat Designation and ANSI Flange connections

InletInchDN

1

1 1/2

1 1/2

1 1/2

1 1/22

2 1/2

3

4

4

4

4

6

6

SeatCode

EA

EA

FA

GA

HAHA

JA

KA

LA

MA

NA

PA

QA

RA

OutletInchDN

22222222

2 1/22 1/22 1/22 1/2

33333444444446666666666666688888

PressureGroup

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

Set Pressure2Kg./cm

1.24646

1271.20.546

1271.20.632911.21.23232921.22323641.22020572

16411.3

12.712.736.31.3

12.712.736.3

19

260.88

20.40.76.4

Min Max

461271272042046

127204203291

14320329292

143236464

10220575792164192

12.736.336.372.512.736.336.370.4

926728

20.442.26.416

Centre-to-face dimensions for classmm

S1 Outlet150114114

121152152

121152152152124124124162

14214217117113613613618118118118118418420.3222209209209222228229254241241241241241

300

152

162

S2 Outlet150105

124

124

130

156

178178

197197

181181

240240

240240

300105105

124124124

124124124

130130130

136136

156156

180180180178178

197197

181181225240240240

240

600

105

124124

124124124

156

156156

184190

178178

197197197

225

240240

900

105

124

156

1500

105105

124

156

DimensionH

305305305305305305305355330330355457305305355355457406406406457406406406533559711711584737737737584737737737991

10671067991

1067106710161018

Min.

DimensionH1

505050505050505050505050505050505050505050505050507070707070707070707070

110110110110110110110110

kgs

Weight

1010101710101017222222303030484865313149723954547859809891

11111114191

111111141157167196208216248257268

mm.

DimensionX

305305305305305305305305305305305305305305305305305305305305305660660660660660660660660660660660660660660660660660660660660660660660

H

S2

S1

For inspection dismantling a freespace X must remain above the valve.

Set screwwith VSR

Drain

Accessories SN 110A Cooling Spacer is recommended between body and bonnetfor temperatures greater than 400ºCHeight 'H' increases by 'H1'

H1

15

Subject to change without notice Rev 0 /06/2005

l Operating Medium and State of Medium (gaseous or liquid)

l Molecular Weight (gas) / Density (liquid)l Set, Design and Operating Pressure

2(Kg/cm , bar)l Operating Temperature; ºCl Capacity; Kg/hr.l Material specificationsl Inlet / Outlet Size (Applicable for replacement

requirements)l Applicable accessories

Type Of Valve

Inlet nominal pressure PN

Inlet nominal size DN

API Seat code letter

Outlet nominal size DN

Pressure group

Material specification

Standard Accessories

Example for Valve Codification Ordering Information

Accessories

O-Ring

Disc 4

Body Seat 3

SN-124

Elastic Seat Seal

SN-123

Body Seat 3

Disc 4

Seating for Liquids

SN-104

Cap with Test Gag

VSR1 150 - 1 1/2 FA - 2 -I - 12 - 110

Balanced Piston SN 144

Forbes Marshall Safety Relief Valve VSR1/VSR2 can be fitted with a Balanced Piston, SN 144, which makes the valve independent of back pressure. The discharge pipes of Drum and Superheater Safety Relief Valve and the Start Up pipe can therefore be connected to a common silencer. Valves with Balanced Piston work in the same way as those with Bellows. The outer diameter of the Balanced Piston corresponds to the average Seat diameter of the valve. The gap between the outer diameter of the Piston and the inner diameter of the related bore in the Cover is sealed by a Gasket which seals effect of atmospheric backpressure. Closing pressure differences of 5% & lower can be obtained with SN 144 accessory.

Model VSR1/VSR2 can be provided with Special Seat for Liquids (SN123) and Elastic Seat Seal (SN 124) for leak tightness on gas service.

Valves are also available with Test Gag (SN104) as an optional accessory.

Valves can be offered with Inlet Flange connections as per DIN, JIS, BS standard and with Butt Weld End Connection.

Steam Jacketing and Silencers also offered on Request.

Forbes Marshall Pvt. Ltd. A-34/35, MIDC, Industrial Estate, 'H' Block, Pimpri, Pune - 411 018. India.Tel.: 91(0)20 - 27442020 Fax: 91(0)20 - 27442040E-mail: ga@forbesmarshall.com, vsk@forbesmarshall.com

Branches: Ahmedabad, Alibag, Bangalore, Chennai, Chandigarh, Coimbatore, Delhi, Hyderabad, Jamshedpur, Kolkata, Mumbai, Nagpur, Navi Mumbai, Surat, Vadodara, Visakhapatanam

Area Representaives: Bhopal, Indore, Madurai, Pondicherry

Website : www.forbesmarshall.com