US PATENT SUBCLASS 137 / 115.07
.~.~.~.~ Pilot valve operated

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}
115.03  DF  .~.~.~ Flow rate responsive {7}
115.07.~.~.~.~ Pilot valve operated

DEFINITION

Classification: 137/115.07

Pilot valve operated:

(under subclass 115.03) Subject matter comprising an auxiliary valve control and wherein the bypass or relief valve is controlled by the auxiliary control valve in response to the variation of the flow rate in the main line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

300, for a supplemental valve independent of a main valve for hydrant-type fluid handling.