US PATENT SUBCLASS 251 / 199
.~.~.~.~ Face element directly contacts 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}
197  DF  .~.~.~ Faces pressed by subsequently movable expander {2}
199.~.~.~.~ Face element directly contacts casing

DEFINITION

Classification: 251/199

(under subclass 197) Devices in which the valve face movement is stopped by direct contact with the valve casing at a position other than the valve seat.