US PATENT SUBCLASS 251 / 204
.~.~.~ Moves with respect to head and seat

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  DF  .~.~ Cam or wedge {1}
204.~.~.~ Moves with respect to head and seat

DEFINITION

Classification: 251/204

(under subclass 203) Subject matter wherein the wedge or cam moves with respect to both the head and seat.

(1) Note. For mere adjustment of the cam or wedge with respect to the seat, see subclass 203.