US PATENT SUBCLASS 251 / 307
.~.~.~ Adjustable

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

304  DF  ROTARY VALVES {5}
305  DF  .~ Butterfly {2}
306  DF  .~.~ Head and/or seat packing {1}
307.~.~.~ Adjustable

DEFINITION

Classification: 251/307

(under subclass 306) Devices in which the packing is adjustable to facilitate its original installation or to provide take-up for wear.