Differential loading fluid check valve

Details Differential loading fluid check valve Differential loading fluid check valve

1990-06-15

1991-09-10

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137527, 137531, F16K 1503

Patent

active

050465252

ABSTRACT:
A differential loading fluid check valve, including a unitized valve body having a single service port in its sidewall for selective access to the interior chamber of the check valve. Check valve subassemblies are installed and removed through the service port for valve assembly and service. The same valve body can be configured for either single or double check valve operation by adding or removing check valve subassemblies. Each check valve subassembly includes a base with an aperture, a pivotally mounted clapper, and an overlying pivotally mounted cam arm, spring biased against the movable end of the clapper. An arcuate surface on the cam arm is engaged by the clapper as it moves from a closed position to an open position, providing a beneficial differential reduction in the pressure drop, or loading, through the check valve.

REFERENCES:
patent: 2503424 (1950-04-01), Snyder
patent: 2706488 (1966-04-01), Harrington
patent: 3478778 (1969-11-01), Curtiss
patent: 3789874 (1974-02-01), Hills
patent: 4054153 (1977-10-01), Guyton
patent: 4232704 (1980-11-01), Becker et al.
patent: 4284097 (1981-08-01), Becker et al.

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