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Pneumatic emergency shut-off valve
Model: QDQ421F-25/40
Nominal diameter: DN25∽200mm
Nominal pressure: PN2.5 ~ 4.0MPa, JIS-10K , 20K
Temperature: -40∽ + 80 ℃
Medium: liquefied petroleum gas, natural
Gas source interface: PC1 / 4
High temperature dissolution temperature: 70 ± 5 ℃

Features:

　　This is a safety protection valve installed in liquid and gas pipeline LPG storage and drainage stations, and air compressor (or gas tank) supporting the use of a large number of leaks in the pipeline, the gas pressure relief or high temperature Fusible alloy melts, the valve automatically stop leak, play a safety role in this valve can also be used as a pneumatic valve. Can achieve long-distance control, close quickly, open and flexible. 


 Performance Specifications: 

Nominal pressure PN

2.5, 4.0 MPa

Cylinder pressure

≤4.0MPa

Suitable temperature T

-40 ∽ +80 ℃

Cylinder use medium

Suitable media

LPG, natural gas

Fused temperature

70 ℃ ∽ ± 5 ℃

Closing time

≤10 seconds

Cylinder opening pressure

≥4.0MPa


 Main dimensions and connection dimensions:  Unit: mm

DN

L

H

H1

D

D1

D2

b

f

Z-φd

25

160

230

230

115

85

65

16

2

4-14

32

180

240

240

135

100

78

18

2

4-18

40

200

250

250

145

110

85

18

3

4-18

50

230

270

270

160

125

100

20

3

4-18

80

310

320

320

195

160

135

22

3

8-18

100

350

360

360

230

190

160

24

3

8-23

150

480

510

510

300

250

218

30

3

8-25

200

600

550

550

360

310

278

30

4

12-25


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