US PATENT SUBCLASS 137 / 531
.~.~.~ Varying effective lever arm

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}
528  DF  .~.~ Reciprocating valves {5}
531.~.~.~ Varying effective lever arm

DEFINITION

Classification: 137/531

(under subclass 528) Valves in which the bias is applied through a lever the effective length of which varies as the valve opens or closes.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

233, for lever actuated valves in which the leverage varies during actuation.