US PATENT SUBCLASS 137 / 637.3
.~.~.~ Rotary

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

561 R  DF  SYSTEMS {32}
637  DF  .~ Valves with separate, correlated, actuators {3}
637.2  DF  .~.~ Coaxial stems {1}
637.3.~.~.~ Rotary {2}
637.4  DF  .~.~.~.~> And reciprocating
637.5  DF  .~.~.~.~> Concentric, central valve removable

DEFINITION

Classification: 137/637.3

(under subclass 637.2) Subject matter in which at least one of the coaxial stem valves pivots about a fixed axis to open or close a fluid path or paths (e.g., plug valves, butterfly valves, etc.).