US PATENT SUBCLASS 137 / 115.19
.~.~.~.~.~ Pilot valve

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

87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
109  DF  .~ Self-controlled branched flow systems {4}
115.01  DF  .~.~ Bypass or relief controlled by main line fluid condition {3}
115.13  DF  .~.~.~ Pressure responsive {9}
115.18  DF  .~.~.~.~ Bypass or relief valve responsive to pressure downstream of outlet valve {2}
115.19.~.~.~.~.~ Pilot valve

DEFINITION

Classification: 137/115.19

Pilot valve:

(under subclass 115.18) Subject matter comprising an auxiliary control valve and wherein the bypass or relief valve is controlled by the auxiliary control valve in response to the pressure in the main flow line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

488+, for a fluid pressure-type pilot control.