US PATENT SUBCLASS 251 / 191
.~.~ Packing expands with closing

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}
190  DF  .~ Piston {1}
191.~.~ Packing expands with closing

DEFINITION

Classification: 251/191

(under subclass 190) Subject matter wherein the piston rings or the packing upon closing of the valve are expanded.

SEE OR SEARCH CLASS

277, Seal for a Joint or Juncture, for a generic sealing means or process,

637+, for a static contact seal for other than an internal combustion engine, or a pipe, conduit, or cable having a particular associated mounting or retaining means.