Check valve

Details Check valve Check valve

1989-08-14

1990-10-23

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1502

Patent

active

049644238

ABSTRACT:
A check valve responsive to low cracking pressures includes first and second body portions defining a valve chamber. An inlet and outlet passage communicate with the valve chamber while a valve element received therein moves between open and closed positions responsive to pressure differentials. A stop member welded to the valve body is adapted to limit the opening movement of the valve element. An axially raised central portion of the stop member abuttingly engages the valve element to limit its opening movement yet permit fluid flow around the valve element to plural openings defined in a peripheral region of the stop member. A guide member is interposed between the stop member and valve element to urge a seal member disposed on one face of the valve element toward a seated, closed position.

REFERENCES:
patent: 1334507 (1920-03-01), Shartle
patent: 1800185 (1931-04-01), Thrust
patent: 3036592 (1962-05-01), Lips
patent: 3179122 (1965-04-01), Wasdell
patent: 3194262 (1965-07-01), Hamilton et al.
patent: 3244195 (1966-04-01), Wanner
patent: 3580277 (1971-05-01), Gettel
patent: 4007758 (1977-02-01), Gray et al.
patent: 4218407 (1980-08-01), Robertson
patent: 4637430 (1987-01-01), Scheffel et al.
patent: 4699173 (1987-10-01), Rohling

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