US PATENT SUBCLASS 251 / 170
.~ Seat pressed to valve

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}
170.~ Seat pressed to valve {3}
171  DF  .~.~> Packing presed by gland
172  DF  .~.~> Fluid pressure {1}
174  DF  .~.~> Spring

DEFINITION

Classification: 251/170

(under subclass 157) Devices having means to press or urge a seat against a valve head.