| 摘要 |
A low differential check valve (10) is provided for fire control system, having particular adaptability in a dry system. The check valve (10) is maintained in its closed position by a latch which is controlled by a plunger (80). The plunger is activated, and moved to release the latch, upon the sensing of drop in system air pressure by a higher differential mechanism external of the check valve. The check valve may then be reset, with its clapper (60) moved to its closed condition, without requiring internal access of the check valve (10) to release a clapper latch (74). |
