US PATENT SUBCLASS 251 / 178
.~.~.~ 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}
176  DF  .~ Spring {3}
177  DF  .~.~ Pivoted valve {2}
178.~.~.~ Bifaced

DEFINITION

Classification: 251/178

(under subclass 177) Devices the valve head having two seating faces which seat on oppositely disposed seats in a single flow line.