US PATENT SUBCLASS 137 / 533.21
.~.~.~.~.~.~ Guide stem


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}
532  DF  .~.~.~ Weight biased {2}
533  DF  .~.~.~.~ Valve body is the weight {2}
533.17  DF  .~.~.~.~.~ Guided head {2}
533.21.~.~.~.~.~.~ Guide stem {5}
533.23  DF  .~.~.~.~.~.~.~> With closing stop
533.25  DF  .~.~.~.~.~.~.~> Oppositely disposed
533.27  DF  .~.~.~.~.~.~.~> Head slidable on guide rod
533.29  DF  .~.~.~.~.~.~.~> Guide and seat integral unit
533.31  DF  .~.~.~.~.~.~.~> Guide and closure integral unit


DEFINITION

Classification: 137/533.21

(under subclass 533.17) Devices in which there is provided a rod-like guiding element usually substantially smaller in diameter than the head.