Fail-safe fluid control valve

Details Fail-safe fluid control valve Fail-safe fluid control valve

1976-07-22

1977-11-08

Cohan, Alan

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Serially arranged reversing valves

91 31, 91448, 137596, F15B 1304, F15B 2000

Patent

active

040570045

ABSTRACT:
A fail-safe fluid control valve including a first sleeve accommodated in and fixed to a valve housing, a second valve also accommodated in and fixed to the valve housing in parallel relation with the first sleeve, a first valve spool slidably accommodated in the first sleeve, and a second valve spool slidably accommodated in the second sleeve. The first and second sleeves are properly formed with grooves and ports while the first and second valve spools are properly formed with large diameter portions spaced. When there occurs such an abnormal condition that the first valve spool and the first sleeve are jammed or stuck to each other, the second valve spool is adapted to be moved for actuating the fail-safe control valve under entirely the same condition as a normal condition.

REFERENCES:
patent: 3253613 (1966-05-01), Richolt
patent: 3439707 (1969-04-01), York et al.
patent: 3933176 (1976-01-01), Wheeler

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