Fluid handling – Systems – Flow path with serial valves and/or closures
Patent
1988-05-09
1989-07-11
Fox, John
Fluid handling
Systems
Flow path with serial valves and/or closures
137514, 251288, F16K 1518
Patent
active
048462217
ABSTRACT:
A ball valve with a built-in check valve includes a valve casing having a passageway for a fluid, a ball having a through hole formed therein, also having a valve seat formed inside thereof at a position in the vicinity of one end of the through hole, and rotatably housed in the valve casing so that the through hole is capable of communicating with the passageway, a guide bush provided within the through hole for guiding the check valve, a spiral spring wound on the guide bush for biasing the check valve in the direction of forming a seal contact between the check valve and the valve seat, and rubber or resin damping members attached to the check valve. The check valve is received within the through hole for cutting off the communication between the passageway and the through hole and preventing a counter flow of the fluid, and has a sealing contact portion and a shoulder portion. The shoulder portion of the check valve abuts against an end face of the guide bush when the check valve has been retracted by pressure of the fluid exerted on the check valve against the biasing force of the spiral spring. The sealing contact portion of the check valve is brought into sealing contact with the valve seat by the biasing force of the spiral spring.
REFERENCES:
patent: 2729238 (1956-01-01), Hite
patent: 2945666 (1960-07-01), Freeman et al.
patent: 3612098 (1971-10-01), Bora et al.
Adams Bruce L.
Fox John
Kitz Corporation
Wilks Van C.
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