Motors: expansible chamber type – With motive fluid valve – Relatively movable inlet and exhaust valves for single...
Patent
1997-05-28
1999-02-09
Nguyen, Hoang
Motors: expansible chamber type
With motive fluid valve
Relatively movable inlet and exhaust valves for single...
91459, 91461, 13759616, 251 3002, F15B 1108
Patent
active
058680594
ABSTRACT:
An electrohydraulic displacement controlled valve module is disposed in a bore of a valve body for controlling fluid flow between first and second ports. A main valve element slideably disposed in the bore is biased to a closed position blocking communications between an annular groove of the valve element and the second port. An actuating chamber defined at one end of the valve element receives pressurized pilot fluid for urging the main valve element toward an open position communicating the first and second ports through the annular groove. A passage communicates the actuating chamber with a control chamber disposed at the other end of the valve element through an orifice. A poppet is disposed within the control chamber and is biased into sealing engagement with an annular valve seat of an outlet port by a feedback spring disposed between the valve element and the poppet. A proportional electromagnetic device is suitable connected to the valve body for controlling the position of the poppet relative to the valve seat to control the fluid pressure in the control chamber.
REFERENCES:
patent: 4416187 (1983-11-01), Nystrom
patent: 4750704 (1988-06-01), Brundage
patent: 4848721 (1989-07-01), Chudakov
patent: 5138838 (1992-08-01), Crosser
patent: 5211196 (1993-05-01), Schwelm
patent: 5588463 (1996-12-01), Kervagoret
patent: 5597013 (1997-01-01), Ushakov
Burrows J. W.
Caterpillar Inc.
Grant John W.
Nguyen Hoang
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