US PATENT SUBCLASS 417 / 112
.~.~.~ With flexible pressure responsive sensing element (i.e., bellows, diaphragm, etc.)

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.~.~.~ With flexible pressure responsive sensing element (i.e., bellows, diaphragm, etc.) {1}
113  DF  .~.~.~.~> Sensing element controls pilot valve

DEFINITION

Classification: 417/112

(under subclass 109) Apparatus wherein said valve means is actuated by an associated flexible diaphragm or bellows-type sensing element which is responsive to the pressure of either the liquid to be pumped, or the gaseous pumping fluid.