US PATENT SUBCLASS 251 / 183
.~.~.~.~ Encased

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
181  DF  .~.~.~ Plug {2}
183.~.~.~.~ Encased {1}
184  DF  .~.~.~.~.~> At actuator end

DEFINITION

Classification: 251/183

(under subclass 181) Subject matter wherein the spring is enclosed by the valve housing or by an auxiliary spring housing.