US PATENT SUBCLASS 137 / 221
.~ Internal servo-motor with internal pilot valve

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

219  DF  LARNER-JOHNSON TYPE VALVES; I.E., TELESCOPING INTERNAL VALVE IN EXPANDED FLOW LINE SECTION {2}
221.~ Internal servo-motor with internal pilot valve {1}
222  DF  .~.~> Pilot controlled passage in nose or needle

DEFINITION

Classification: 137/221

(under subclass 219) Flow control devices in which a controlled motor device comprising a pilot operated or servo-mechanism is involved, the motor device and its pilot or control valve being located within the internal part of the valve, i.e., the part comprising the telescoping support and the needle or movable valve head lying within the flow passage.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

25+, for valve actuation involving fluid type pilot or servo type motors, and see the search notes to subclass 25.