US PATENT SUBCLASS 417 / 113
.~.~.~.~ Sensing element controls pilot valve

Current as of: June, 1999
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417 /   HD   PUMPS

65  DF  ONE FLUID PUMPED BY CONTACT OR ENTRAINMENT WITH ANOTHER {10}
108  DF  .~ Aerated column {1}
109  DF  .~.~ Valved gas inlet {7}
112  DF  .~.~.~ With flexible pressure responsive sensing element (i.e., bellows, diaphragm, etc.) {1}
113.~.~.~.~ Sensing element controls pilot valve

DEFINITION

Classification: 417/113

(under subclass 112) Apparatus wherein said valve means comprises a pilot valve and a main valve, said pilot valve controlling actuating fluid to the main valve to control actuation thereof, and said sensing element controlling the actuation of said pilot valve.