US PATENT SUBCLASS 251 / 316
.~.~ Replaceable

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

304  DF  ROTARY VALVES {5}
314  DF  .~ Seat or interface seal {1}
316.~.~ Replaceable {2}
317  DF  .~.~.~> Deformable material
317.01  DF  .~.~.~> Carried by head

DEFINITION

Classification: 251/316

(under subclass 314) Subject matter comprising seat or sealing elements so constructed or arranged in the casing as to be readily replaced by strictly manual operations.