Filtering apparatus with improved quick-opening backwash valve

Details Filtering apparatus with improved quick-opening backwash valve Filtering apparatus with improved quick-opening backwash valve

1997-10-10

1999-05-25

Popovics, Robert J.

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

210791, 210798, 210108, 210411, 210412, 210425, 137109, 137493, B01D 3704

Patent

active

059067519

ABSTRACT:
A filtering apparatus is provided wherein the filter can be backwashed by an explosive-like surge of backwashing fluid. The backwashing assembly includes a quick-opening backwash valve which is not actuated by a linearly-acting valve stem disposed on the outlet side of the valve. In a typical embodiment, the inlet valve to the filtering apparatus is a rotating butterfly valve and the backwash valve is physically attached to the inlet valve, such that, when the inlet valve is open, the backwash valve is fully-closed and when the inlet valve is moved towards its fully-closed position, the backwash valve is fully-opened. The invention uses a two-step method of initially applying biasing pressure on the inlet valve/backwash valve combination and to thereafter provide additional pressure to dislodge the backwash valve from the valve seat--whereupon the backwash valve quickly opens and an explosive-like surge of backwashing fluid effectively backwashes the filtering media. Because the backwash valve is a non-outlet side linearly actuated valve, the discharge pipe running away from the backwash valve need not have any abrupt bends, so the explosive-like surge is maximized.

REFERENCES:
patent: 3888280 (1975-06-01), Tartaglia
patent: 3908693 (1975-09-01), Cooper
patent: 4055500 (1977-10-01), Parker
patent: 4477343 (1984-10-01), Tucker
patent: 4614581 (1986-09-01), Drori
patent: 4936989 (1990-06-01), Walker
patent: 5129419 (1992-07-01), Stapleton

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