US PATENT SUBCLASS 251 / 168
.~.~.~ Screw

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}
167  DF  .~.~ Bifaced {2}
168.~.~.~ Screw

DEFINITION

Classification: 251/168

(under subclass 167) Devices comprising threaded means between the valve face elements and their carrier.