US PATENT SUBCLASS 251 / 61.3
.~.~.~ Valve between coaxial spring biasing means and actuator

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}
61.2  DF  .~.~ Coaxial actuator, seat and valve {3}
61.3.~.~.~ Valve between coaxial spring biasing means and actuator

DEFINITION

Classification: 251/61.3

(under subclass 61.2) Subject matter in which the control member is biased by spring means concentric with the axis of such member and positioned on the side of the control member opposite that of the flexible wall, the spring means acting between a fixed member and the control member.