US PATENT SUBCLASS 251 / 203
.~.~ Cam or wedge

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

157  DF  WITH MEANS TO INCREASE HEAD AND SEAT CONTACT PRESSURE {8}
193  DF  .~ Gate valve {3}
203.~.~ Cam or wedge {1}
204  DF  .~.~.~> Moves with respect to head and seat

DEFINITION

Classification: 251/203

(under subclass 193) Subject matter wherein the means to press the valve to its seat includes a wedge or cam.