| 摘要 |
A valve (10) comprising a housing (12) formed with a downstream port (14) and an upstream port (28), with an axially displaceable plunger (34) biased into sealing engagement of a major flow path (78) extending between the downstream port (14) and the upstream port (28) for admitting flow only in the upstream direction. The plunger is formed with a normally closed minor flow path (86) for admitting flow only in a downstream direction. |
