| 摘要 |
The axially shifting, spring-loaded stop (42, 44) is subjected to pressure in the second gas line (16) and is positioned in such a way that the valve seat (18, 20) of the first chamber is closed when the pressure declines in the first gas line (10) and when the pressure in the second line fails to rise in accordance with the operation. The chambers are in one housing (32), communicate with the gas lines (10, 12, 14, 16) and are sealed in relation to each other. The first chamber (34) comprises a valve seat (18, 20) subjected to the effective pressure of the first gas line, while the second chamber (40) comprised an axially shifting, spring-loaded stop for the valve seat of the first chamber.
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