Combination surge relief and back flow prevention valve

Details Combination surge relief and back flow prevention valve Combination surge relief and back flow prevention valve

1975-07-17

1976-09-28

Cohan, Alan

Fluid handling

Systems

Supply and exhaust

251 83, F16K 1110

Patent

active

039825612

ABSTRACT:
A combination shut-off pressure surge relief and reverse flow prevention valve is disclosed comprising manually rotatable valve stem with a movable valve member at its lower end that is biased towards its closed position by a spring so that flow in a normal direction will open the valve but reverse flow is prevented. The pressure surge relief valve is completely enclosed within the rotatable valve stem and comprises a spring loaded slidable piston that is movable by abnormal pressure surges to expose relief ports for allowing controlled leakage under surge conditions. The leakage from the ports is deflected by a surrounding shroud on the handle of the valve stem.

REFERENCES:
patent: 3420493 (1969-01-01), Kraft
patent: 3721264 (1973-03-01), Coughlin

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