US PATENT SUBCLASS 251 / 302
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Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

298  DF  PIVOTED VALVES {3}
301  DF  .~ Gate {1}
302.~.~ Bifaced

DEFINITION

Classification: 251/302

(under subclass 301) Devices wherein the valve head has two seating faces which seat simultaneously on oppositely disposed seats in a single flow line.