US PATENT SUBCLASS 251 / 344
.~.~ Flow passage in sleeve

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

341  DF  VALVE ACTUATOR IS VALVE CASING OR EXTENSION THEREOF {5}
343  DF  .~ Sleeve valve {2}
344.~.~ Flow passage in sleeve

DEFINITION

Classification: 251/344

(under subclass 343) Devices in which a flow passage in the sleeve connects spaced ports in the valve body, and movement of the sleeve controls communication between the ports.