US 4,057,364 AGranted

Fluid transfer systems and valves therefor

OwnerJohn Bratschitschinventor

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Abstract

A pumping system intended especially for highly contaminated liquids uses an air pump for drawing liquid into or discharging the liquid from a vessel by creating respectively a vacuum or a pressurized condition within the vessel. A special valve device is provided for the system comprising an air filter in combination with a float-actuated, shut-off switch to preclude the entry of air or liquid-borne contaminants into the pump. The float-actuated switch is arranged to disable a prime mover used for driving the pump. An additional safety feature of the system comprises the provision of an intermediate float valve located between the pump and the valve device, to preclude the passage of liquid therebetween, the intermediate valve having a sight glass to detect leakage liquid and a drain cock to permit drainage of such liquid.

Claims7

Dependent claims

A fluid transfer system for transferring liquid from a source thereof to the interior of a liquid-receiving tank by the withdrawal of air from the said interior and for transferring liquid from the tank interior to the exterior thereof by the supply of air to the said interior comprising:

an air transfer pump unit for the said withdrawal of and supply of air;
an air transfer passage connecting the interior of the tank to the air transfer pump unit;
a first float responsive means positioned at least partly in the tank interior and actuated in response to the presence of a predetermined level of liquid in the tank interior to close the air transfer passage and thereby preclude the passage of liquid into the air transfer passage;
and a secondary float valve means connected in the air transfer passage between the said air pump unit and the said first float responsive means and actuated in response to receipt of liquid from the air transfer passage between the first float responsive means and itself to close the air transfer passage and thereby to further preclude the possibility of passage of liquid from the tank interior to the air transfer pump unit.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 05/640,318Filed 12 Dec 1975 · division
Priority: 23 Aug 1974
Granted: 8 Nov 1977
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

F04F 1/02
Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped: using both positively and negatively…
Y10T 137/3109
Diverse fluid containing pressure systems: liquid filling by evacuating container
F04F
Pumping of fluid by direct contact of another fluid or by using
Y10T
Technical subjects covered by former us classification