US PATENT SUBCLASS 251 / 258
.~.~.~ Bi-directional


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

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
251  DF  .~ Cam {3}
257  DF  .~.~ Encased with seal {4}
258.~.~.~ Bi-directional


DEFINITION

Classification: 251/258

(under subclass 257) Devices in which the cam element has symmetrically arranged cam surfaces which permit actuation of the valve by rotation of an actuating stem in either of two directions.