US PATENT SUBCLASS 137 / 847
.~.~.~.~.~ With biasing means

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}
843  DF  .~.~ Resilient material valve {4}
844  DF  .~.~.~ Having expansible port {2}
846  DF  .~.~.~.~ Having exit lip {4}
847.~.~.~.~.~ With biasing means

DEFINITION

Classification: 137/847

(under subclass 846) Valve wherein closing of the exit lip is effected or facilitated by an additional force applying means.