US PATENT SUBCLASS 251 / 173
.~.~.~ Butterfly valve

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

157  DF  WITH MEANS TO INCREASE HEAD AND SEAT CONTACT PRESSURE {8}
170  DF  .~ Seat pressed to valve {3}
172  DF  .~.~ Fluid pressure {1}
173.~.~.~ Butterfly valve

DEFINITION

Classification: 251/173

(under subclass 172) Devices in which the valve is of the butterfly type.

SEE OR SEARCH THIS CLASS, SUBCLASS:

305+, for other butterfly valves.