Switching valve

Details Switching valve Switching valve

1980-04-16

1981-12-01

Chambers, A. Michael

Motors: expansible chamber type

With motive fluid valve

Plural actuators for single valve means

13762568, F15B 13043, F16K 2500

Patent

active

043030033

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: 2603192 (1952-07-01), Kensok
patent: 2955617 (1960-10-01), Collins
patent: 3304221 (1967-02-01), Eggleton
patent: 3370612 (1968-02-01), Holl
patent: 3406701 (1968-10-01), Meulendyk
patent: 3556154 (1971-11-01), Kramer
patent: 3838710 (1974-10-01), Reip
patent: 4220074 (1980-09-01), Reip

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