Three-way hydraulic valve

Details Three-way hydraulic valve Three-way hydraulic valve

1988-04-22

1989-01-03

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91417R, 251297, F15B 13042

Patent

active

047949503

ABSTRACT:
An open-center three-way hydraulic valve as applicable to hydraulic control circuits of electric circuit-breakers comprises an admission valve-head which is restored to the closed position by a first spring, a drain valve-head which is displaced toward the closed position by a pilot valve, a second spring which is more powerful than the first and tends to close the drain valve-head, and a resilient semi-locking mechanism for retaining the drain valve-head in the open position in opposition to the second spring when the pilot jack is not under pressure.

REFERENCES:
patent: 2900960 (1959-08-01), Gratzmuller
patent: 4026523 (1977-05-01), Gratzmuller
patent: 4151861 (1979-05-01), Bohrdt et al.

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