US PATENT SUBCLASS 251 / 305
.~ Butterfly

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

304  DF  ROTARY VALVES {5}
305.~ Butterfly {2}
306  DF  .~.~> Head and/or seat packing {1}
308  DF  .~.~> Head and stem connections

DEFINITION

Classification: 251/305

(under subclass 304) Devices wherein the pivot is centrally located in the valve member, providing oppositely directed radial wings.

SEE OR SEARCH THIS CLASS, SUBCLASS:

173, for valves of this type having fluid pressure means to press the seat to the valve.