Power plants – Pressure fluid source and motor – Having plural energy outputs
Patent
1991-06-19
1992-11-10
Look, Edward K.
Power plants
Pressure fluid source and motor
Having plural energy outputs
91446, 91532, F16D 3102
Patent
active
051613735
ABSTRACT:
Disclosed is a hydraulic control valve system, for driving a plurality of hydraulic actuators by a single pump, including pressure compensation valves and a shuttle valve disposed in a vertical bore orthogonal to a lateral bore of a valve body, into which a spool of a direction switching valve is fitted. A load sensing chamber for introducing a load pressure of an actuator is formed at an intersection between the lateral bore and the vertical bore. An opening-side first pressure receiving surface of the pressure compensation valve confronts the load sensing chamber. The pressure compensation valve has an opening-side second pressure receiving surface contacting a pilot pressure in the vicinity of the opening-side first pressure receiving surface. Formed on the upper side of the pressure compensation valve are a closing-side first pressure receiving surface on which a bridge pressure acts and a closing-side first pressure receiving surface on which an external control pressure acts. The pressure compensation valve incorporates a throttle check valve working as a resistance at a descending time upon receiving a closing-side pressure in a region of the opening-side first pressure receiving surface.
REFERENCES:
patent: 3126795 (1964-03-01), Kesselring
patent: 4129987 (1978-12-01), Blume
patent: 4192346 (1980-03-01), Iizumi
patent: 5025625 (1991-06-01), Morikawa
patent: 5056312 (1991-10-01), Harita et al.
Kajita Yusuke
Morikawa Rindo
Sugiyama Genroku
Hitachi Construction Machinery Co. Ltd.
Look Edward K.
Lopez F. Daniel
Zexel Corporation
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