Piloted check valve

Details Piloted check valve Piloted check valve

1983-04-14

1988-12-27

Scott, Samuel

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

251361, 251368, F16K 31143

Patent

active

047935901

ABSTRACT:
A piloted check valve includes a closure that is pressure balanced to relieve pressure on non-metallic seat when valve is closed against high pressure differential. The closure includes a disc having a stem moving in a sealed chamber communicating through the stem and disc with the interior of the valve seat opening. The chamber is provided by a cylindrical wall received in a socket in the valve body. The closure disc has a lip engaging the seat, the lip I.D. being about equal to that of the seat opening and the valve stem.

REFERENCES:
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patent: 3022978 (1962-02-01), Kowalski et al.
patent: 3145733 (1964-08-01), Shaw et al.
patent: 3443789 (1969-05-01), Glasgow et al.
patent: 3529624 (1970-09-01), Cryder et al.
patent: 3540472 (1970-11-01), Brady
patent: 3787027 (1974-01-01), Curnow et al.
patent: 4040600 (1977-08-01), Coppola et al.
patent: 4076210 (1978-02-01), Spielvogel
patent: 4391293 (1983-07-01), Keenan
patent: 4421292 (1983-12-01), Matsui et al.
patent: 4461449 (1984-07-01), Turner

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