US PATENT SUBCLASS 251 / 180
.~.~ Rotary 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}
176  DF  .~ Spring {3}
180.~.~ Rotary valve {2}
181  DF  .~.~.~> Plug {2}
185  DF  .~.~.~> Spring in fluid

DEFINITION

Classification: 251/180

(under subclass 176) Subject matter wherein the valve is of the rotary type.