US PATENT SUBCLASS 137 / 516.17
.~.~.~.~ Central post on seat

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}
516.11  DF  .~.~ Single head, plural ports in parallel {2}
516.15  DF  .~.~.~ Annular head {1}
516.17.~.~.~.~ Central post on seat {2}
516.19  DF  .~.~.~.~.~> Stop {1}
516.23  DF  .~.~.~.~.~> Guide

DEFINITION

Classification: 137/516.17

(under subclass 516.15) Valves wherein the seat supports a post, the said post being substantially concentric with the annular head.