US PATENT SUBCLASS 137 / 329.1
.~ Removable valve with normally disabled supplemental check valve

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

315  DF  WITH REPAIR, TAPPING OR ASSEMBLY MEANS {6}
329.1.~ Removable valve with normally disabled supplemental check valve {1}
329.2  DF  .~.~> Check valve disabled by normally movable main valve part {2}

DEFINITION

Classification: 137/329.1

(under subclass 315) Apparatus in which the main valve is arranged to be removable and a supplemental check valve is provided upstream, biased to close by fluid pressure and/or a spring; the check-valve being maintained inoperative in normal use of the main valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

285, 300 and 301+, for similar devices in hydrants.

512+, and 613+, for serial valves wherein one valve is a supplemental valve to permit the repair of another valve.