US PATENT SUBCLASS 137 / 222
.~.~ Pilot controlled passage in nose or needle

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  DF  .~ Internal servo-motor with internal pilot valve {1}
222.~.~ Pilot controlled passage in nose or needle

DEFINITION

Classification: 137/222

(under subclass 221) Flow control devices in which the pilot valve controls a passage through the needle or movable part of the valve means internal to the flow line.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

38+, for choked pressure type servo motors for valve actuation in which the pilot valve is seated in the motor or valve element.