Duplex filter apparatus

Details Duplex filter apparatus Duplex filter apparatus

1985-01-14

1986-10-07

Adee, John

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Fluid pressure responsive by-pass

210133, 210136, 210340, B01B 2936

Patent

active

046158006

ABSTRACT:
The present invention is directed to a duplex filter apparatus which provides for a first primary filter path and a second path for secondary filtration. The first path includes a shutoff valve on one side of the primary filter and a check valve on the downstream side. The second path includes a regulating bypass valve on the upstream side of the secondary filter and a check valve on the downstream side. The regulating bypass valve gradually shifts fluid flow from the first path to the second path when differential pressure across the primary filter increases beyond a predetermined level. A reservoir return bypass valve directs fluid flow gradually from the secondary filter when differential pressure across the secondary filter increases beyond a predetermined level. Bleed valves are provided to relieve pressure on filter elements when the filter elements are isolated so that servicing may occur.

REFERENCES:
patent: 3154485 (1964-10-01), Liddell
patent: 3485369 (1969-12-01), Voorheis
patent: 3979292 (1976-09-01), Kuhn
patent: 4033870 (1977-07-01), Parquet et al.
patent: 4496460 (1985-01-01), Haarstad et al.

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