Hydraulic valves and systems

Details Hydraulic valves and systems Hydraulic valves and systems

1998-05-13

1999-11-30

Nguyen, Hoang

Motors: expansible chamber type

With motive fluid valve

Both inlet and exhaust controlled by motive fluid pressure...

91527, 91528, 192 85, 192103F, F15B 1110

Patent

active

059922940

ABSTRACT:
An hydraulic valve has two outlets and is switchable so that fluid can only be supplied to one outlet at a time. A spool with two seals is slidable in a housing under the action of two proportional solenoids and is urged to a central position by two springs where the seals block passage to both outlets. When the spool is moved in one direction it allows flow to one outlet and also allows flow via a bypass channel to an opposite side of the spool counteracting the force applied by the solenoid so that the force applied to an outlet can be controlled gradually.

REFERENCES:
patent: 3715017 (1973-02-01), Jenney
patent: 3757822 (1973-09-01), Kell
patent: 3818800 (1974-06-01), Berteaux
patent: 3951166 (1976-04-01), Whitener
patent: 4294287 (1981-10-01), Boswell
patent: 5184643 (1993-02-01), Raymond
patent: 5240041 (1993-08-01), Garnjost
patent: 5251535 (1993-10-01), Lacher et al.
patent: 5251671 (1993-10-01), Hiroki
patent: 5564274 (1996-10-01), Denbraber et al.

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