Three-way proportional valve

Details Three-way proportional valve Three-way proportional valve

1983-07-18

1986-02-11

Michalsky, Gerald A.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

1375962, 13762563, 13762564, F15B 13043

Patent

active

045692734

ABSTRACT:
An electrohydraulic proportional valve wherein an electromagnetic force motor sends a mechanical signal to a pilot actuator which moves a main spool. The pilot actuator includes a pilot spool slidably received in a pilot sleeve. A feedback spool which is movable with the main spool has a camming surface against which the pilot sleeve rides. A load check valve is provided that isolates the load pressure from system pressure when desired.

REFERENCES:
patent: 3653409 (1972-04-01), Brannon
patent: 3875849 (1975-04-01), Patel
patent: 4011891 (1977-03-01), Knutson et al.
patent: 4266572 (1981-05-01), Schuttenberg et al.
patent: 4290447 (1981-09-01), Knutson
patent: 4376453 (1983-03-01), Moretti et al.
Society of Automotive Engineers Technical Paper Series, No. 780747, Sep. 1978, Kisnor Patel, "Pressure Compensated Electro-Hydraulic Proportional Flow Control Valve".

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