Bag Filter Housings and Filter Vessels

A bag filter housing is the pressure vessel that holds a liquid filter bag in your process line. Typical housings are top loading, with a swing bolt closure and an O-ring lid seal. A perforated support basket sits inside the housing and holds the filter bag in place under pressure, and vent and drain valves let you relieve pressure and empty the housing before a bag change.

Liquid enters through a side inlet above the filter bag and flows into the open top of the bag. It passes out through the filter media and the basket and leaves through the outlet, while the solids collect inside the bag. The ring at the top of the bag seals against the housing so liquid cannot bypass the filter.

When the bag is loaded, the pressure drop across the housing rises. The lid is opened, the used bag is lifted out with the solids inside it, and a new bag is dropped into the basket, so bag changes are quick and clean.

Need replacement bags? See our liquid filter bags →

Inside every bag filter housing, the support basket carries the load. It holds the filter bag open and keeps it from bursting as the pressure builds, while the ring or collar at the top of the bag seats against the housing to create the seal.

A good seal is what keeps unfiltered liquid from slipping past the bag. Worn lid gaskets, damaged baskets and bags that do not fit the housing are the most common causes of bypass, so the housing, basket and bag need to be matched. We supply liquid filter bags for all standard and most custom housings.

AFF filter bag housings are manufactured from carbon steel, stainless steel and aluminum. Carbon steel housings are an economical choice for many industrial liquids. Stainless steel housings are used where the liquid is corrosive or where the process has to stay clean, such as food, beverage and chemical processing. Aluminum housings are lightweight.

Tell us the liquid, the operating pressure and temperature and the connections you need, and we will recommend the housing material and configuration for your filtration system.

Along with bag filter housings, we supply cartridge filter housings and lenticular filter housings, including housings for botanical extraction systems. A cartridge housing holds one or more liquid filter cartridges for fine filtration and polishing, often downstream of a bag filter that removes the heavier solids first.

Pairing a bag housing ahead of a cartridge housing protects the finer cartridges and extends their service life. See our CBD filters for extraction filtration systems.