US PATENT SUBCLASS 137 / 513.5
.~.~.~ Permits flow at valve interface

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  DF  .~.~ With leak passage {2}
513.5.~.~.~ Permits flow at valve interface

DEFINITION

Classification: 137/513.5

(under subclass 513.3) Devices in which the nominally engaging surfaces of the head and/or seat elements are so constructed or arranged that when the valve is closed, a limited flow passage exists between said surfaces.