Device for automatic circulation in a waste water pump station

Details Device for automatic circulation in a waste water pump station Device for automatic circulation in a waste water pump station

1989-06-22

1990-05-15

Nilson, Robert G.

Pumps

Including means to prevent foreign material settling from...

13750513, 251 57, 417299, F04B 2100

Patent

active

049253751

ABSTRACT:
A device is provided for obtaining automatic circulation in waste water pump stations. At the pressure side of the pump unit, there is a valve which opens during certain times to form a connection between the pump and the pump station to create a circulation. The valve is opened and closed by means of communicating bellows which are controlled by the pressure difference between two sections in the valve having different areas.

REFERENCES:
patent: 3039733 (1962-06-01), Mattioli
patent: 3223116 (1965-12-01), Criddle
patent: 3900045 (1975-08-01), Murrell
patent: 4462766 (1984-07-01), Carlsson

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