US PATENT SUBCLASS 251 / 159
.~.~ Seat pressed to 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}
158  DF  .~ With positive reduction {3}
159.~.~ Seat pressed to valve

DEFINITION

Classification: 251/159

(under subclass 158) Devices in which the seat is pressed against the valve head.