US PATENT SUBCLASS 137 / 528
.~.~ Reciprocating valves

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.~.~ Reciprocating valves {5}
529  DF  .~.~.~> Plural biasing means
530  DF  .~.~.~> Cam means for adjusting and fixing bias
531  DF  .~.~.~> Varying effective lever arm
532  DF  .~.~.~> Weight biased {2}
535  DF  .~.~.~> Spring biased {5}

DEFINITION

Classification: 137/528

(under subclass 511) Valves in which the movable member of the valve moves substantially rectilinearly between its extreme positions. Ball valves are included although their motion may not be strictly rectilinear.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

318+, for reciprocating valves of general utility, and see the search notes thereto.