US PATENT SUBCLASS 137 / 513.3
.~.~ With leak passage

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
513.3.~.~ With leak passage {2}
513.5  DF  .~.~.~> Permits flow at valve interface
513.7  DF  .~.~.~> Bypass in valve casing

DEFINITION

Classification: 137/513.3

(under subclass 511) Devices in which means are provided to permit limited flow through the valve when the valve is closed, or nominally closed.