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Safety relief valve

Spring Loaded Safety Relief Valve For Liquid

Spring-loaded safety relief valve works through adjusting spring force to prevent medium pressure and realize sealing purpose. Under the condition of spring force greater than medium's normal pressure, valve disc is at the close state, when medium pressure exceeds the set pressure, the spring is compressed, and lead the disc sealing faces separated, the valve open automatically, and relief pressure; When medium pressure reduced to normal pressure, the valve disc go back to valve seat under the spring force, disc sealing faces and valve seat sealed again, the valves close automatically.

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Description

Spring-loaded safety relief valve works through adjusting spring force to prevent medium pressure and realize sealing purpose. Under the condition of spring force greater than medium's normal pressure, valve disc is at the close state, when medium pressure exceeds the set pressure, the spring is compressed, and lead the disc sealing faces separated, the valve open automatically, and relief pressure; When medium pressure reduced to normal pressure, the valve disc go back to valve seat under the spring force, disc sealing faces and valve seat sealed again, the valves close automatically.


Features:      
Enclosed Bonnet             
Low lift/Full lift safety valve
metal to metal seated,standard safety valve for liquids
Flanged connection acc. to ASME,DIN,JIS,BS etc.


Applications:
Provided as safety device for protection against excessive pressurein pressure vessels
Approved for gases and fluids
Working temperatures:-60°Cup to +200°Cfor stainless steel material
-29°C up to300°C for cast steel material

Standards Compliance:
Design and Manufacture:API RP 520
Face to Face(end to end):API 526
Test and Inspection:API 527


Model/Types:
1.spring loaded low lift enclosed bonnet safety relief valve(A41)
2.spring loaded Full lift enclosed bonnet safety relief valve(A42)
3.spring loaded Full lift enclosed bonnet safety relief valve with lever(A44)

In order to offer a quotation,we need specifications as following:
1.Flange Connection standard
2.Pressure Rating
3.Size
4.Set Pressure
5.Material for Body&Trim (Material for inside parts).
6.Operation type: With lever or not 
7.Medium
8.Working Temperature
Spring Loaded Safety Relief Valve For Liquid( Main property specifiecation)

Nominal pressure

PN(Class)

150

300

600

900

1500

Body strength

Ps(Mpa)

3.0

7.5

15

22.5

37.5

Set pressure

Pk(Mpa)

0.1-2

1.6-5

3.2-10

8-25

10-25

Seal pressure

Pm(Mpa)

90%Pk

Reseation pressure

Ph(Mpa)

≥90%Pk

Relieving Pressure

Pp(Mpa)

≤1.1Pk

Lift height

H(mm)

≥1/20 d0

Appropriate temp.

≤200℃

Appropriate Medium

C(WCB)  P, R (SS304, SS316)

Gas, Liquid Nitric Acetic Acid, Gas, Liquid

Spring Loaded Safety Relief Valve For Liquid (Code of throat diameter)

Code

Diameter

Code

Diameter

D

10

L

50

E

13

M

55

F

16

N

60

G

20.5

P

72

H

26

Q

96

J

33

R

115

K

40

T

148

 Materials for main parts

No

Name of part

Materials A42H-C

Material A42Y-P

Material A42Y-R

1

Body

WCB

CF8

CF8M

2

Nozzle

2Cr13/ 304

CF8

CF8M

3

Adjusting Ring

2Cr13/ 304

304

316

4

Disc

2Cr13/ 304

304

316

5

Guide sleeve

2Cr13/ 304

304

316

6

Bonnet

WCB

CF8

CF8M

7

Spring

50CrVA

50CrVA coated teflon

50CrVA coated teflon

8

Stem

2Cr13

304

316

9

Adjusting bolt

45

2Cr13

2Cr13

10

Cap

ZG200-400

ZG200-400

ZG200-400

Sealing surface of material "H" depositing D507,  "Y" depositing stellite

Drawing For Example:

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