US PATENT SUBCLASS 417 / 143
.~.~.~ Motive fluid supply or exhaust valve responsive to motive fluid pressure

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}
137  DF  .~.~ Cyclic pumping {5}
143.~.~.~ Motive fluid supply or exhaust valve responsive to motive fluid pressure

DEFINITION

Classification: 417/143

(under subclass 137) Apparatus wherein the alternate admission and ejection of the fluid which is pumped into and from the pump chamber results from the alternate admission and withdrawal of the motive fluid to or from the pump chamber said motive fluid being controlled by valve means responsive to the motive fluid pressure.

(1) Note. The pressure responsive means does not include a

mere pressure responsive check valve in the motive fluid inlet or outlet of the pumping chamber.