US PATENT SUBCLASS 417 / 128
.~.~.~ With intermediate 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}
118  DF  .~ Liquid pumped by supplying or exhausting gaseous motive fluid to or from pumping chamber {7}
126  DF  .~.~ With float actuated control means {5}
128.~.~.~ With intermediate pilot valve

DEFINITION

Classification: 417/128

(under subclass 126) Apparatus wherein the flow of the fluid which is pumped or the flow of the motive fluid is controlled by a valve means which is controlled by the buoyed means through a pilot valve means.