US PATENT SUBCLASS 137 / 516.13
.~.~.~ Concentric ports

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}
516.13.~.~.~ Concentric ports

DEFINITION

Classification: 137/516.13

(under subclass 516.11) Valves wherein the ports are arranged concentrically.