Fail-safe fluid control valve

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

1978-01-30

1980-03-11

Maslousky, Paul E.

Motors: expansible chamber type

Moving cylinder

Cylinder and piston have relative reciprocation on fixed axis

91384, 91436, F01B 1500, F15B 910

Patent

active

041922182

ABSTRACT:
A fail-safe fluid control valve comprises a first sleeve accommodated in and fixed to a valve housing, a second sleeve slidably received in the first sleeve, and a valve spool slidably received in the second sleeve. The first and second sleeves are properly formed with grooves and ports while the valve spool is properly formed with spaced large diameter portions. When there occurs such an abnormal condition that the valve spool is jammed or stuck to the second sleeve, the second sleeve is axially moved in unison with the valve spool by an input lever for actuating the fail-safe control valve under the same condition as a normal condition in which the valve spool is axially moved by the input lever.

REFERENCES:
patent: 2597419 (1952-05-01), Westbury et al.
patent: 2922400 (1960-01-01), Lorence
patent: 3272062 (1966-09-01), Flippo et al.

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