Duplex Bag Filter

Duplex Bag Filter for Continuous Operations Without Cleaning Shutdown

Duplex bag filter is a kind of filter that consists of 2 single bag filters and their inlets and outlets are connected together via butterfly valve and ball valves. This special design allows one bag filter to maintaining running when the other bag filter is in maintenance, thereby reducing the overall operating costs.

  • Allow continuous operation and reduce downtime.
  • Filter rating: 0.5–800 μm
  • Easy to install and replace filter bags, easy to operate
  • An adjustable bracket is provided, as a result, the height of the filter is adjustable.
  • Special materials and sizes are available upon request.
Duplex bag filter
Working Principle

Duplex bag filter consists of 2 single bag filters connected together via valves. During the filtration, generally, one bag filter performs filtration and the other one works as a standby. The position of the inlet is higher than that of filter bags. Filter medium flows into the filter bag in service from the inlet. After filtration, the impurities are trapped in the filter bag, and the clean filtrate flows out from the outlet along the fixed metal basket wall.

When replacing the filter bag, you may close the filter on the side the filter bag needs to be replaced and open the standby filter for filtration. In this way, it ensures the system performs continuous filtration and reduces costly downtime.

A duplex bag filter housing
Replacement

Duplex bag filter consists of 2 single bag filters connected together via valves. During the filtration, generally, one bag filter performs filtration and the other one works as a standby. When replacing the filter bag, open the standby filter and change out the filter bag while the other filter performing continuous operation to reduce costly downtime.

  1. Cut off the water flow into the filter bag that needs to be replaced and drain it out.
  2. Remove the filter cover and take out the dirty bag. It is recommended to check the filter basket and clean it as needed. Put the cleaned basket and new bag back into the filter.
  3. Check the O-ring at the top of the housing and apply food grade grease to prevent it from drying out. Be sure the chemical properties of the grease are compatible with the O-ring and then reinstall the filter and make it access to the system.
Specification
  • Housing material: Carbon steel, SS304, SS316.
  • Support basket material: Stainless steel woven wire mesh or stainless steel perforated metal mesh
  • Bag type: Stainless steel, PE, PP, nylon, PTFE filter bags
  • Number of bags: Two bags
  • Gasket: EPDM, NBR, Viton, PEFE, silica gel, etc.
  • Filter rating: 0.5–800 μm (depends on application and filter types)
  • Surface treatment: Mirror polishing
  • Capacity: 50 gpm – 200 gpm per bag
  • Operating pressure: 150 psi (10 bar)
  • Operating temperature: 250 °F (120 °C)
  • Housing weight: 240 lb (109 kg)
Application

Bag filters are mainly used to remove trace fine impurities from liquids and are widely used in the following industries.

Duplex bag filter used in the beer brewing process

For beer brewing

Duplex bag filter used in the pigment production process

For pigment production