US PATENT SUBCLASS 251 / 164
.~.~.~ Screw

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}
158  DF  .~ With positive reduction {3}
160  DF  .~.~ Rotary valve {3}
164.~.~.~ Screw {1}
165  DF  .~.~.~.~> Non-reciprocating {1}

DEFINITION

Classification: 251/164

(under subclass 160) Subject matter wherein the means to increase and reduce the seating pressure comprises screw means.