US PATENT SUBCLASS 251 / 306
.~.~ Head and/or seat packing

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.~.~ Head and/or seat packing {1}
307  DF  .~.~.~> Adjustable

DEFINITION

Classification: 251/306

(under subclass 305) Devices providing a sealing material or element carried by the valve head, by the valve seat or by both.

SEE OR SEARCH CLASS

277, Seal for a Joint or Juncture, for a generic sealing means or process,

628+, for a static contact seal for other than an internal combustion engine, or a pipe, conduit, or cable.