Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Reexamination Certificate
2007-07-17
2007-07-17
Leslie, Michael (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
C091S454000, C137S625250
Reexamination Certificate
active
11117384
ABSTRACT:
A valve is provided for a hydraulic system having a source of pressurized fluid, a fluid actuator, and a proportional pressure compensating valve. The valve has a bore in fluid communication with the source and the fluid actuator. The valve also has a valve element disposed in the bore and movable between a flow blocking position and a flow passing position to selectively fluidly communicate the source with the fluid actuator. The valve also has a valve signal passageway disposed within the valve element and configured to be in fluid communication with a pressurized fluid having a signal pressure indicative of pressure supplied to the fluid actuator. The valve further has first and second orifices disposed within the valve element in fluid communication with the valve signal passageway and the bore. The valve signal passageway is configured to communicate the signal pressure with the first and second orifices. Movement of the valve element from the flow blocking position to the flow passing position fluidly communicates the first orifice with a system signal passageway before the second orifice, and fluidly communicates both the first and second orifices with the system signal passageway when the valve element is in the flow passing position.
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U.S. Appl. No. 11/117,385 filed Apr. 29, 2005.
Kuehn Jeff L.
Ma Pengfei
Patel Kalpesh N.
Zhang Jiao
Caterpillar Inc
Finnegan Henderson Farabow Garrett & Dunner
Leslie Michael
Shin Caterpillar Mitsubishi Ltd
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