Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1978-11-13
1981-06-02
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
64 29, 251 636, 251 87, 251264, 251 77, 251318, 251335B, F16K 3150, F16K 31122
Patent
active
042707277
ABSTRACT:
A valve is provided which includes a poppet enclosed in a plug of plastic material, such as Teflon, and which is biased against a seat by a compression spring so that a positive seal is provided even in the presence of cold flow in the plastic plug. A valve stem engages the poppet, and it serves to pull the poppet and plug away from the seat against the force of the spring when the valve is opened, and to force the poppet and plug against the seat when the valve is closed. The valve may be hand operated, or it may be operated by a pressurized fluid, such as air. An indicator is included in the assembly which provides a readily visible indication of any leakage within the valve housing.
REFERENCES:
patent: 1731145 (1929-10-01), MacMillin
patent: 1799667 (1931-04-01), Ziegler
patent: 2439523 (1948-04-01), Miller et al.
patent: 2693822 (1954-11-01), Gerow et al.
patent: 2872149 (1959-02-01), Battey et al.
patent: 3087510 (1963-04-01), Normand, Jr.
patent: 3434691 (1969-03-01), Hamilton
patent: 3744751 (1973-07-01), Robinson
patent: 4102154 (1978-07-01), Dahlstrand, Jr.
Beecher Keith D.
Schwadron Martin P.
Torr Vacuum Products, Inc.
Walton G. L.
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