US PATENT SUBCLASS 251 / 182
.~.~.~.~ Expanding

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}
176  DF  .~ Spring {3}
180  DF  .~.~ Rotary valve {2}
181  DF  .~.~.~ Plug {2}
182.~.~.~.~ Expanding

DEFINITION

Classification: 251/182

(under subclass 181) Subject matter wherein the spring expands separable sections which comprise the valve head.