Duplex seal for a bag-type filter system

Abstract

A filter system includes a tank with a removable cover at one end and a filter basket and liner therefor insertable into the tank to divide it into unfiltered liquid and filtered liquid zones. Inlet and outlet openings are disposed at the open and remaining end, respectively, of the tank with the inlet opening being in the side wall of the tank, near such open end, so as not to interfere with opening and closing of the cover. Inner and outer annuli are fixed to the tank side wall and face radially into the tank, with the inlet opening interposed axially therebetween. A spacer insertable into the tank comprises an annular inner disk pressable toward the inner annulus for gripping therebetween an inner resilient seal which in turn engages the adjacent edges of the filter basket and filter liner to prevent leakage therearound between the unfiltered and filtered liquid zones. The spacer includes an outer disk with a radially extending free edge overlying the outer annulus and adapted to support an outer resilient seal between the outer annulus and cover for sealing against liquid leakage from the tank at the cover, such that tightening of the cover onto the tank sealingly compresses the outer resilient seal and through the spacer sealingly compresses the inner resilient seal. The spacer is of open construction permitting liquid communication between the inlet opening to the tank and the open end of the filter liner.