US PATENT SUBCLASS 55 / 420
.~ Check valve


Current as of: June, 1999
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55 /   HD   GAS SEPARATION

418  DF  WITH INFLOW GAS CONTROL OR DISTRIBUTION {3}
420.~ Check valve


DEFINITION

Classification: 55/420

(under subclass 418) Apparatus comprising a valve of the direct response type, i.e. the valve moves in one direction in response to change in the flow or pressure of the incoming gas and resumes its normal, neutral or biased position when the original flow or pressure condition is restored.

SEE OR SEARCH CLASS

137, Fluid Handling,

511+, for the structure of the valve, per se.