US PATENT SUBCLASS 251 / 172
.~.~ Fluid pressure

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  DF  .~ Seat pressed to valve {3}
172.~.~ Fluid pressure {1}
173  DF  .~.~.~> Butterfly valve

DEFINITION

Classification: 251/172

(under subclass 170) Devices applied by fluid pressure.