Flow check valve with bias spring removal capability

Details Flow check valve with bias spring removal capability Flow check valve with bias spring removal capability

1976-11-15

1978-08-08

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1728

Patent

active

041050444

ABSTRACT:
A spring-biased, normally open flow check valve with on-line in-service replacement capability is disclosed. A plug member which prevents reverse flow is disposed within a housing having an orifice for passing forward fluid flow through the valve. The housing is threadingly engaged on one end with a removable spring reaction support member. A helical spring is disposed within the housing for biasing the spherical plug member in a direction away from sealing the orifice. The spring reaction support member may be threadingly disengaged from the valve housing to permit removal and/or replacement of the helical spring without releasing downstream fluid pressure.

REFERENCES:
patent: 218024 (1879-07-01), Hennessy et al.
patent: 2929399 (1960-03-01), MacGowan
patent: 3234961 (1966-02-01), Arnes

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