US PATENT SUBCLASS 137 / 541
.~.~.~.~.~ Spring in inlet


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



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}
535  DF  .~.~.~ Spring biased {5}
540  DF  .~.~.~.~ Spring coaxial with valve {9}
541.~.~.~.~.~ Spring in inlet


DEFINITION

Classification: 137/541

(under subclass 540) Valves in which the spring is located on the side of the valve which is exposed to the fluid pressure to which the valve is to be responsive, i.e., the spring and valve are on opposite sides of the valve seat and the spring is in the fluid conduit or container.