US PATENT SUBCLASS 251 / 201
.~.~.~.~ Pivoting 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}
200  DF  .~.~.~ Carried expander contacts valve casing {1}
201.~.~.~.~ Pivoting expander

DEFINITION

Classification: 251/201

(under subclass 200) Devices in which the expander pivots on contacting the valve casing.