US PATENT SUBCLASS 251 / 223
.~.~.~.~ Sleeve is bonnet

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
215  DF  .~ Plural motions of valve {5}
218  DF  .~.~ Encased {2}
221  DF  .~.~.~ Threads in removable sleeve {3}
223.~.~.~.~ Sleeve is bonnet

DEFINITION

Classification: 251/223

(under subclass 221) Devices in which the bonnet is threaded and thus becomes the sleeve.