US PATENT SUBCLASS 137 / 329.3
.~.~.~ Ball check

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

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

DEFINITION

Classification: 137/329.3

(under subclass 329.2) Devices in which the check valve is of the ball-check type.