US PATENT SUBCLASS 251 / 200
.~.~.~ Carried expander contacts valve casing

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.~.~.~ Carried expander contacts valve casing {1}
201  DF  .~.~.~.~> Pivoting expander

DEFINITION

Classification: 251/200

(under subclass 195) Devices in which an expander element is brought into operation by contact with the valve body before the face elements have reached their furthermost closing positions.

SEE OR SEARCH THIS CLASS, SUBCLASS:

198, for carried expanders combined with expanders which move after the faces are stopped.