US PATENT SUBCLASS 251 / 185
.~.~.~ Spring in fluid


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  DF  .~.~ Rotary valve {2}
185.~.~.~ Spring in fluid


DEFINITION

Classification: 251/185

(under subclass 180) Subject matter wherein the pressing means comprises a spring exposed to the line flow.