| 摘要 |
<p>A universal hydraulic stop valve (10) has a housing (12) having check valves (20, 22) in a check valve bore (74). A needle (30) in needle bore (72) has spaced apart seals (60) which may alternately seal against valve seats (52, 54) on adjustable knobs (26, 28), with movement of the needle, which may be mechanically linked to a machine element moved by a hydraulic actuator (140). The universal hydraulic valve sets accurate starting and stopping positions, and also provides for gradual feathered stops.</p> |
