US PATENT SUBCLASS 251 / 218
.~.~ Encased

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.~.~ Encased {2}
219  DF  .~.~.~> Threadlessly coupled to screw {1}
221  DF  .~.~.~> Threads in removable sleeve {3}

DEFINITION

Classification: 251/218

(under subclass 215) Devices in which the coacting mechanical movement elements are completely enclosed within the valve body.

SEE OR SEARCH THIS CLASS, SUBCLASS:

214, for packed or sealed valve stems wherein some special relationship exists between the elements of the valve and the sealing means.

274+, for similar structure having valve heads which have a single motion.