High pressure hydraulic flow control valve

Details High pressure hydraulic flow control valve High pressure hydraulic flow control valve

1988-02-24

1989-05-02

Michalsky, Gerald A.

Fluid handling

Systems

With flow control means for branched passages

91452, 3759612, 375992, 37881, 298 22C, F15B 13042

Patent

active

048259098

ABSTRACT:
A high pressure hydraulic flow control valve is formed with a spool which is capable of operating as a conventional spool to control the flow of fluid from an input port to an output port or to a return port. The spool also provides overload protection which will permit fluid to pass from the input port directly to the return port when an overload pressure condition exists in the fluid supply line. In alternative structure, the overload pressure release system may be incorporated into the valve which is used to control the return of fluid from the output port to the return passage. The high pressure hydraulic flow control valve is formed from a die-cast housing and has hardened seats mounted in access passages so as to bear against a seating shoulder. Preferably, a retaining sleeve is mounted in the access passage to bear against the hardened seat to retain it against the seating shoulder.

REFERENCES:
patent: 3878864 (1975-04-01), Schurger
patent: 4182534 (1980-01-01), Snyder

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