Pilot operated control valve for hydraulically actuated reciproc

Details Pilot operated control valve for hydraulically actuated reciproc Pilot operated control valve for hydraulically actuated reciproc

1984-07-25

1985-11-12

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762414, F15B 13042

Patent

active

045521808

ABSTRACT:
A pilot pressure fluid operated spool type power fluid distributing valve for operating a hydraulically powered reciprocating piston pump includes a spool closure member with opposed unequal diameter bores formed in the spool ends. Pilot actuator pistons project into the bores and include pilot pressure fluid passages opening into the bores from sources of pilot control fluid. The bore of smaller diameter includes an enlarged annular chamber which may be closed by a cooperating ridge on the associated piston and a reentrant edge of the bore so that the closure member may be biased in one position if already in that position until a predetermined pilot fluid pressure is present in the opposite bore.

REFERENCES:
patent: 3015317 (1962-01-01), Buchanan
patent: 3209782 (1965-10-01), Wolpin et al.

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