Check valve

Details Check valve Check valve

1987-05-29

1988-06-21

Cohan, Alan

Fluid handling

Diverse fluid containing pressure systems

Fluid separating traps or vents

F16K 1500

Patent

active

047519401

ABSTRACT:
A check valve using a porous membrane to discriminate between gases and liquids. An elastomeric porous membrane disposed in the valve body at right angles to flow bears directly against a non-porous closure plate which is held off of a valve seat by a spring whose force acts opposite to the direction of fluid flow. The valve, therefore, is normally open. Air flows through the membrane with relatively little resistance and therefore passes through the valve unimpeded. Liquid, on the other hand, meets substantially high resistance to flow and creates a force on the membrane opposing the bias force exerted by the spring. Liquid, therefore, tends to displace the membrane and the closure member against the valve seat to close the valve. The device is advantageously applied to fuel management systems.

REFERENCES:
patent: 2261648 (1941-11-01), Goldstein
patent: 3326230 (1967-06-01), Frank
patent: 3421534 (1969-01-01), Henderson
patent: 3508576 (1970-04-01), Gross
patent: 3719197 (1973-03-01), Pannier
patent: 4188978 (1980-02-01), De Lorenzo
patent: 4372353 (1983-02-01), Weas

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