Hayward Duplex Polypropylene Bag Filter Housings

Hayward duplex bag filter housings use a pair of linked 3-way ball valves to divert flow to one chamber while simutanesouly isolating the other chamber, enabling drainage and changing of the filter bag without intruption of hte process flow.  The 3-way valves are made of CPVC and can be actuated if desired, although actuation should be via a manually pressed button and not based upon differential pressure as this helps ensure that the filter bag is changed before the other chamber becomes clogged also.

The oversized chamber cover handles enable removal and installation without the need for tools; each chamber cover has a vent valve for venting the air during initial filling.  The chamber covers are designed to dispalce fluid such that opening a filled vessel results in the liquid level to be below the very top of the bag filter chamber, making it easier to remove the filter bag.  As illustrated below the inlet and outlet ports are facing the same direction, alhtough the true union design enables positioning these ports opposite of each other with the upper port being the inlet and the lower port the outlet.

Although alloy #2 size bag filters and nominally rated #2 size filer bags are rated for flow rates up to 180 GPM, non-alloy bag filters are only rated to approximaltey 100 GPM and the reason for this is to minimize the fluid velocity to <5 FPS.  High fluid velocity can damage the filter bag, true union connections and valves in the system.