Control valve

Details Control valve Control valve

1993-03-25

1994-12-27

Swinehart, Edwin L.

Marine propulsion

Screw propeller

With means effecting or facilitating movement of propulsion...

114144R, 137625069, 137596013, B63H 512

Patent

active

053760298

ABSTRACT:
A control valve for a pressurized fluid-operated system, such as a marine power steering system, includes a housing having an inlet and at least one outlet, with one or more work ports located therebetween. Pressurized fluid is supplied to the inlet, and a spool member is mounted within the housing for controlling the supply of pressurized fluid to a work-performing system, such as the extendible and retractable rod of a hydraulic cylinder assembly. The spool member includes structure for blocking the one or more work ports when the spool member is in its neutral position, when it is desired not to operate the system. This prevents the cylinder from being exposed to reservoir fluid when the spool member is in its neutral position.

REFERENCES:
patent: 3581771 (1971-06-01), Garrison
patent: 3768376 (1973-10-01), Orme
patent: 4337796 (1982-07-01), Bonney
patent: 4595370 (1986-06-01), Small

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