This invention relates to pumps and more particularly to a diaphragm pump of the type having a sealed pumping compartment.
Diaphragm pumps of the type having a sealed pumping compartment are well known, being shown and described, for example in U.S. Pat. No. 2,741,187.
Although such pumps are widely used in the chemical and the like industries for metering purposes by supplying a stream of liquid at a predetermined rate, they have proved to be subject to certain deficiencies. One of these is especially apparent in intermittent use, in which air enters the pumping chamber, so that the pump will not automatically resume pumping, but must be primed.Water Pump Control Valves Another is apparent in the pumping of slurries, in which solid particles tend to collect in the pumping compartment, to the extent that it must periodically be cleaned to keep the pump in operation.

Accordingly, it is a major object of the present invention to solve the above and other problems by providing a novel diaphragm pump which will automatically resume pumping in intermittent use.

It is another object of the present invention to provide a novel diaphragm pump especially adaptable for the pumping of slurries.

It is still another object of the invention to provide a novel diaphragm pump of practical and economical construction.

The present invention accomplishes the above objects by providing in a diaphragm pump having an enclosed sealed pumping compartment with an uppermost edge portion, pumping valve means including a pair of one-way valve elements, such as ball valves, providing a valve chamber therebetween, said one-way valve elements being spaced from one another for flow of liquid through said chamber, preferably in an upward direction, pumping liquid passageway means communicating between said valve chamber and only said uppermost edge portion of said pumping compartment sloping in an upward direction from said uppermost edge portion to said valve chamber, for gravity retention of liquid in said pumping compartment and flushing liquid passageway means communicating into the lower portion of the pumping compartment and valve means therefor, WATER POWER CONTROL VALVEsaid pumping means being free of other liquid communication for preventing introduction of air into said pumping compartment and passageway means. Timing means may be provided for said flushing liquid valve means.

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2011-11-30

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