Main Features of Pneumatic Emergency Shut-off Valve QDQ421F-25/40:
Pneumatic Emergency Shut-off Valve QDQ421F-25/40 produced by TopVal is a kind of safety protection valve.It is installed on the liquid phase and gas phase pipeline of liquefied petroleum gas storage and irrigation station and used with air compressor (or gas storage tank), so that when a large amount of pipeline leakage occurs, pressure relief of air source or high temperature will melt the fusible plug alloy, and the valve will automatically close and stop leakage, playing a role of safety protection.This valve can also be used as a pneumatic globe valve.It can realize remote control, close quickly and open flexibly.
Performance Specifications of Pneumatic Emergency Shut-off Valve QDQ421F-25/40:
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 of Pneumatic Emergency Shut-off Valve QDQ421F-25/40: 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 |
