Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1995-06-30
1997-01-14
Nguyen, Hoang
Fluid handling
Line condition change responsive valves
Direct response valves
251121, 91447, F16K 1500
Patent
active
055929672
ABSTRACT:
In a hydraulic device including at least two actuators both adapted to be operated by a single pump, one of the actuators having priority over the other actuator, a control valve for the one actuator including a load hold check valve adapted to assign a variable priority function to the one actuator over the other actuator, the load hold check valve including a valve body provided with a pair of ports respectively communicating with the actuators and a parallel fluid passage communicating with the pump, the parallel fluid passage also communicating with a selected actuator port in an opened state thereof, a poppet disposed in the valve body and adapted to fully open the parallel fluid passage at a full stroke thereof and partially opening the parallel fluid passage at a limited stroke thereof, and a pressure setting spring adapted to always urge the poppet toward the initial position for closing the parallel fluid passage.
REFERENCES:
patent: 3465788 (1969-09-01), Tennis
patent: 3970108 (1976-07-01), Ailshie
patent: 4167197 (1979-09-01), Maki et al.
patent: 4192346 (1980-03-01), Iizumi
patent: 5251444 (1993-10-01), Ochiai et al.
patent: 5315826 (1994-05-01), Hirata et al.
Nguyen Hoang
Samsung Heavy Industries Co. Ltd.
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