Switching valve

Details Switching valve Switching valve

1977-05-25

1980-09-02

Schwadron, Martin P.

Motors: expansible chamber type

With motive fluid valve

Plural actuators for single valve means

13762564, 13762568, 251174, 428422, F15B 13043, F16K 2500, B32B 2706

Patent

active

042200741

ABSTRACT:
A pilot operated switching valve includes a sliding spool that is actuated by pilot pressure to control fluid through the valve to a prime mover. The ends of the spool are exposed to pilot pressure that moves the spool within the valve housing to control fluid flow through passages to and from the spool. The passages are sealed by the spool at selected positions to minimize internal leakage and also to allow the valve to hydraulically lock the prime mover. The switching valve also includes a manual switch that is in fluid communication with a source of pressurized fluid. The manual switch may be manually actuated to direct pilot fluid to one of the two ends of the sliding spool thereby manually actuating the valve.

REFERENCES:
patent: 1690767 (1928-11-01), Bloch
patent: 1928452 (1933-09-01), Haywood
patent: 2376022 (1945-05-01), Wolcott
patent: 2603192 (1952-07-01), Kensok
patent: 2955617 (1960-10-01), Collins
patent: 3304221 (1967-02-01), Eggleton
patent: 3340897 (1967-09-01), Nevulis
patent: 3370612 (1968-02-01), Holl
patent: 3406701 (1968-10-01), Meulendyk
patent: 3556154 (1971-01-01), Kramer
patent: 3599675 (1971-08-01), Sievenpiper
patent: 3776276 (1973-12-01), Stitler
patent: 3790127 (1974-02-01), Reip
patent: 3838710 (1974-10-01), Reip
patent: 3922955 (1975-12-01), Kast
patent: 4048370 (1977-09-01), Orkin et al.
patent: 4074011 (1978-02-01), Teramae et al.

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