| 摘要 |
This invention relates to the art of relief and unloading valves which are connected to a hydraulic circuit to relieve excess pressure and more particularly a valve which has a deformable bladder which is precharged with gas under pressure to a value such as to retain a valve member in closed position until the fluid pressure in the circuit exceeds a predetermined amount, overcoming the force exerted by the charged bladder, at which time the valve member will open to relieve the fluid pressure.
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