Motors: expansible chamber type – With motive fluid valve – Pilot valve
Patent
1987-08-28
1989-03-14
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Pilot valve
91447, 91455, F15B 1108
Patent
active
048116505
ABSTRACT:
A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump system for supplying fluid, and a directional valve provided to which the fluid from the pump is supplied for controlling flow to and from the actuator. A pair of lines extends from the directional valve to the respective openings of the actuator. A controller alternately supplies a first fluid pilot pressure to pressure reducing valves associated with the directional valve for reducing the pressure from the pump system or any other source and supplying a second reduced pilot pressure to the directional valve for controlling the flow to and from the actuator. Preferably, the directional valve comprises a meter-in valve and a meter-out valve associated with each line to the actuator for controlling flow out of the actuator. Each meter-in valve and meter-out valve is operated by the second pilot pressure from the pressure reducing valve.
REFERENCES:
patent: 2974639 (1961-03-01), O'Connor et al.
patent: 3340897 (1967-09-01), Nevulis
patent: 4145957 (1979-03-01), McClocklin
patent: 4353289 (1982-10-01), Lonnemo
patent: 4509406 (1985-04-01), Melocik
patent: 4590968 (1986-05-01), Wolfges
Look Edward K.
Vickers Incorporated
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