US PATENT SUBCLASS 416 / 67
.~.~ Valve type

Current as of: June, 1999
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416 /   HD   FLUID REACTION SURFACES (I.E., IMPELLERS)

64  DF  TRANSLATORY REACTION MOTION {2}
66  DF  .~ Flexible or relatively movable working member or part {2}
67.~.~ Valve type

DEFINITION

Classification: 416/67

(under subclass 66) Apparatus wherein the movement of the working member or parts thereof are such to permit flow of

working fluid through a defined aperture under predetermined operating conditions and to close off such through flow during other operating conditions.