US PATENT SUBCLASS 251 / 162
.~.~.~ 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}
158  DF  .~ With positive reduction {3}
160  DF  .~.~ Rotary valve {3}
162.~.~.~ Cam or wedge {1}
163  DF  .~.~.~.~> Encased

DEFINITION

Classification: 251/162

(under subclass 160) Subject matter wherein the means to increase and/or to reduce the seating pressure comprises cam or wedge means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

203+, for other gate valves provided with cam or wedge means that increase the seating pressure only.