US PATENT SUBCLASS 137 / 491
.~.~.~.~ Choked passage through main valve head


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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
485  DF  .~ Pilot or servo controlled {3}
488  DF  .~.~ Fluid pressure type {2}
489  DF  .~.~.~ Choked or throttled pressure type {4}
491.~.~.~.~ Choked passage through main valve head


DEFINITION

Classification: 137/491

(under subclass 489) Apparatus in which the restricted and unvalved passage passes through the main or flow controlling valve.