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Classification：Liquefied gas valve
Trade names：
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| QDQ421F-25\QDQ421F-40 cuts off the valve pneumatically promptly |
| Type of the products: QDQ421F |
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Characteristic:
This is a kind of safe protection valve. Installation stores and irritates standing on the liquid phase and gaseous phase pipeline in the liquefied petroleum gas , use with the air compressor (or gas tank ) together, in order to when a large amount of leakage takes place in the pipeline, source of the gas is it pigeonhole to let out or high temperature make fusible to fill in alloy melt, the valve is closed and stopped leaking automatically, play a safe protection role. This valve can be made and used for the pneumatic stop valve. Can realize remote control , close rapidly, it is flexible to open.
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Performance norm:
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Nominal pressure PN
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2.5, 4.0MPa
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The air cylinder uses the pressure
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≤ 4.0MPa
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Suitable temperature T
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-40∽ +80 degrees Centigrade
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The air cylinder uses the medium
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Use the medium
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Liquefied gas , natural gas
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Melt the temperature of closing
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70 degrees Centigrade of ∽± are 5 degrees Centigrade
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Close and stop time
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≤ is 10 seconds
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The air cylinder opens the pressure
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≥ 4.0MPa
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QDQ421F-25/40 cuts off the valve pneumatically promptly
Open directly (DN ): 25∽ 200 ( mm)
Pressure (PN ): 2.5,4.0MPa JIS-10K,20K
Source of the gas interface : PC1/4
The high temperature dissolves the temperature of closing: 70± 5 degrees Centigrade |
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The size of main appearance and size of connecting: Unit: mm
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PN
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DN
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L
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H
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H1
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D
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D1
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D2
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b
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f
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Z- φ d
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25
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160
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230
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230
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115
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85
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65
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16
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2
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4-14
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32
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180
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240
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240
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135
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100
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78
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18
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2
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4-18
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40
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200
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250
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250
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145
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110
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85
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18
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3
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4-18
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50
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230
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270
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270
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160
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125
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100
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20
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3
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4-18
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80
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310
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320
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320
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195
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160
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135
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22
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3
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8-18
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100
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350
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360
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360
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230
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190
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160
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24
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3
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8-23
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150
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480
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510
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510
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300
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250
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218
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30
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3
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8-25
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200
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600
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550
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550
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360
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310
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278
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30
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4
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12-25
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