Change-over valve

Details Change-over valve Change-over valve

1990-11-15

1992-05-26

Michalsky, Gerald A.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Condition responsive means for modifying working member...

91517, 13759617, 1375962, 192 8714, 192109F, F15B 1307

Patent

active

051157217

ABSTRACT:
A change-over valve including a valve housing defining an inlet port for receiving fluid from a fluid pressure supply, a first outlet port for feeding operating fluid to a first fluid responsive actuator, a second outlet port for feeding operating fluid to a second fluid responsive actuator, and drain port means for draining fluid to a fluid reservoir; and a spool retained by the housing and movable therein between first and second positions, the housing and the spool in its first position providing communication between the inlet port and the first outlet port and preventing communication between the inlet port and the second outlet port, and the housing and the spool in its second position providing communication between the inlet port and the second outlet port, and preventing communication between the inlet port and the first outlet port. Also included is a control valve movable between open and closed positions in response to the fluid pressure at the first outlet port, the control valve providing communication between the second outlet port and the drain port means when in its open position and preventing communication therebetween when in its closed position.

REFERENCES:
patent: 2502800 (1950-04-01), Renick
patent: 3473566 (1969-10-01), Peppel
patent: 4172582 (1979-10-01), Bobnar
patent: 4597557 (1986-07-01), Krieger et al.
patent: 4667570 (1987-05-01), Jensen et al.

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