US PATENT SUBCLASS 251 / 202
.~.~.~ Faces or carrier contact stationary expander

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}
193  DF  .~ Gate valve {3}
195  DF  .~.~ Bifaced {4}
202.~.~.~ Faces or carrier contact stationary expander

DEFINITION

Classification: 251/202

(under subclass 195) Devices in which the valve faces are moved into contact with an expanding surface which is relatively fixed to the valve casing.