Liquid purification or separation – Filter – With residue removing means or agitation of liquid
Patent
1976-02-10
1977-10-25
Adee, John
Liquid purification or separation
Filter
With residue removing means or agitation of liquid
210425, 251 76, B01D 2938
Patent
active
040555003
ABSTRACT:
Filtering apparatus in which a fluid filter has a filtering flow passage with an inlet end connected to an inlet control valve, and an outlet end connected with an outlet control valve, said filter having a fluid storage reservoir in communication with the outlet end of the flow passage so that by closing the outlet valve and opening the inlet valve clean filtered fluid may be forced into the reservoir in a manner to compress the entrapped air and provide a supply of pressurized clean filtered fluid for use in a backwashing reverse flow operation through the filtering flow passage, during which the inlet and outlet valves are both closed.
The backwash flow is controlled by a unique quick-opening backwash poppet valve which is so connected with the flow passage that the fluid pressure of the backwashing fluid will act to normally urge the backwash valve to a closed position which prevents the reverse flow until the backwash poppet valve is opened.
A unique feature of the backwash valve resides in the provision of actuating means for quickly opening the backwash valve in a manner to produce an explosive-like surge in the backwashing flow in order to more effectively dislodge accumulated filtered media in the filter.
In one form, the backwash valve embodies manually operable means for applying an impact valve opening force; and in another form the valve opening force is applied by means of a pressurized fluid actuator in combination with spring means.
REFERENCES:
patent: 582402 (1897-05-01), Stifel
patent: 1256766 (1918-02-01), Behrendt et al.
patent: 2039099 (1936-04-01), Mastenbrook
patent: 2338417 (1944-01-01), Forrest et al.
patent: 2728547 (1955-12-01), Crookston et al.
patent: 3025871 (1962-03-01), Roth et al.
patent: 3380590 (1968-04-01), Grayson
patent: 3540690 (1970-11-01), Brown
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