Soft seat check valve

Details Soft seat check valve Soft seat check valve

1978-02-06

1979-10-30

Cline, William R.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1506

Patent

active

041724690

ABSTRACT:
A check valve having dual seats and dual poppets which act in a series arrangement as a double valve. One seat poppet combination employs an o-ring type seal and the second seat poppet arrangement employs a metal-to-metal sealing surface. Each seat poppet arrangement performs in typical check valve fashion. The mechanics of operation of the dual valve series arrangement is such that the soft seal valve always opens and closes under essentially zero flow conditions preventing extrusion or errosion of the soft seal and preserving the zero leakage sealing surface.

REFERENCES:
patent: 1960963 (1934-05-01), Wheeler et al.
patent: 2403029 (1946-07-01), Smith
patent: 2481482 (1949-09-01), Green
patent: 2500156 (1950-03-01), Dechant
patent: 2595012 (1952-04-01), Smith
patent: 2830620 (1958-04-01), Shuptrine
patent: 2912000 (1959-11-01), Green
patent: 2912001 (1959-10-01), Green
patent: 3029835 (1962-04-01), Biello et al.
patent: 3171440 (1965-03-01), Napolitano
patent: 3379407 (1968-04-01), Napolitano
patent: 3542063 (1970-11-01), Etter et al.
patent: 3642029 (1972-02-01), Katchka
patent: 3749123 (1973-07-01), Fletcher

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