US PATENT SUBCLASS 251 / 61.1
.~.~ Flexible wall valves fluid

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

12  DF  FLUID ACTUATED OR RETARDED {12}
61  DF  .~ Flexible wall expansible chamber reciprocating valve actuator {2}
61.1.~.~ Flexible wall valves fluid

DEFINITION

Classification: 251/61.1

(under subclass 61) Subject matter in which the surface of the flexible wall working member outside the expansible chamber constitutes the movable control member which member is adapted to be moved to engage a valve seat.