US PATENT SUBCLASS 251 / 221
.~.~.~ Threads in removable sleeve

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.~.~.~ Threads in removable sleeve {3}
222  DF  .~.~.~.~> Sleeve removably in bonnet
223  DF  .~.~.~.~> Sleeve is bonnet
224  DF  .~.~.~.~> Sleeve flange mounted between body and bonnet

DEFINITION

Classification: 251/221

(under subclass 218) Devices in which one of cooperating thread elements is formed within or upon a sleeve-like element which is detachable or removable from the valve body.

SEE OR SEARCH CLASS

137, Fluid Handling,

243.5, for actuators of this type having special provision for grinding the valve on its seat.