Pressure operated pilot control shut-off valve

Details Pressure operated pilot control shut-off valve Pressure operated pilot control shut-off valve

1979-10-05

1981-08-11

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 38, 251 45, F16K 3140

Patent

active

042830400

ABSTRACT:
A fluid pressure operated pilot control diaphragm valve having the pilot opened in response to energization of an electromagnetic actuator. The actuator includes a movable armature means operable to open the pilot and stop means movable with the armature for limiting the amount of opening of the pilot. The stop means includes means operative to prevent closing of the pilot when the armature means is subsequently moved by fluid pressure opening of the diaphragm valve.

REFERENCES:
patent: 2496553 (1950-02-01), Littlefield
patent: 2504428 (1950-04-01), Kimball
patent: 2654393 (1953-10-01), Ghormley
patent: 2940722 (1960-06-01), Vargo
patent: 2965350 (1960-12-01), Knaebel et al.
patent: 3114532 (1963-12-01), Gray et al.
patent: 3405906 (1968-10-01), Keller
patent: 3593956 (1971-07-01), McCarty, Jr.
patent: 3872878 (1975-03-01), Kozel et al.
patent: 3917218 (1975-11-01), Marocco
patent: 4174824 (1979-11-01), Kolze

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