Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1976-08-25
1979-01-30
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
251 635, 251282, F16K 31122
Patent
active
041368517
ABSTRACT:
A line or directional valve of the type that is adapted for use in fire extinguishing systems of the gas dissemination type is provided, employing a moveable piston adapted to be unseated from a valve seat, upon delivery of fluid for opening thereof, wherein the forces of the valve piston against the valve seat are reduced and controlled by utilizing inlet fluid pressure that is operative against the piston in such a way as to reduce the forces from inlet fluid pressure on the piston to a desired net or resultant force. A vent is also provided for facilitating keeping the piston open after its initial opening.
REFERENCES:
patent: 2083695 (1937-06-01), Dull
patent: 2619120 (1952-11-01), Page et al.
patent: 2799466 (1957-07-01), Hickerson
patent: 2996074 (1961-08-01), Page et al.
patent: 3358964 (1967-12-01), Cohen et al.
Hansen Arne
Troup George
Chemetron Corporation
Schwadron Martin P.
Walton G. L.
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