US PATENT SUBCLASS 137 / 519
.~.~.~ Weight biased

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}
517  DF  .~.~ Biased open {3}
519.~.~.~ Weight biased {2}
519.5  DF  .~.~.~.~> Ball valves
520  DF  .~.~.~.~> Edge pivoted valve

DEFINITION

Classification: 137/519

(under subclass 517) Valves in which the bias means is a weight which may be the weight of the valve body itself.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

338, for weight biases valves, per se, and see the search notes thereto.