US PATENT SUBCLASS 251 / 167
.~.~ Bifaced

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.~.~ Bifaced {2}
168  DF  .~.~.~> Screw
169  DF  .~.~.~> Toggle

DEFINITION

Classification: 251/167

(under subclass 158) Devices the valve being bifaced with pressing means for both faces.