US PATENT SUBCLASS 251 / 163
.~.~.~.~ Encased

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  DF  .~.~.~ Cam or wedge {1}
163.~.~.~.~ Encased

DEFINITION

Classification: 251/163

(under subclass 162) Subject matter having the cam or wedge means within the valve housing.