| 摘要 |
A valve assembly adapted to be used in an environment having an environment pressure includes a body having an end adapted to connect to a pipe having a first fluid line at a first pressure and a coaxial second fluid line at a second pressure. A primary passageway defined through the body is adapted to be connected to the first fluid line. A secondary passageway defined in the body is adapted to be connected to the second fluid line. A valve is disposed on the primary passageway. The valve is movable between a first position where the passageway is open and a second position where the passageway is closed in response to the second pressure in the secondary passageway. The first pressure in the primary passageway is greater than the second pressure in the secondary passageway, and the environment pressure is greater than the second pressure in the secondary passageway. |
