US PATENT SUBCLASS 251 / 176
.~ Spring

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.~ Spring {3}
177  DF  .~.~> Pivoted valve {2}
180  DF  .~.~> Rotary valve {2}
186  DF  .~.~> Piston

DEFINITION

Classification: 251/176

(under subclass 157) Subject matter including a spring to press the head to the seat.