Self-piloting check valve

Details Self-piloting check valve Self-piloting check valve

1995-11-29

1997-06-10

Michalsky, Gerald A.

Fluid handling

Systems

Flow path with serial valves and/or closures

137496, 166325, 1663324, 1663328, F16K 1503, F16K 1518

Patent

active

056366612

ABSTRACT:
A check valve 200 has an elongate cylindrical tubular body 202 which provides mounting for a main flap valve 204. Mounted below the main valve 204 is a smaller multi-leaf flap valve 206. The smaller valve 206 is mounted on a housing 208 which is axially movable relative to the body 202. The housing 208 and valve 206 are normally biased upwardly and in this position a sleeve 214 formed on the upper end of the housing holds the main valve 204 open, and encloses the valve 204 within a valve recess 216 defined in the body 202. The sleeve 214 also extends across the main valve seat 218. Thus, during normal operation of the valve, with flow in a first direction, the sealing surfaces of the main valve 204 and the seat 218 are protected from the fluid by the sleeve 214.

REFERENCES:
patent: 4220176 (1980-09-01), Russell
patent: 4254836 (1981-03-01), Russell

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