Core Technology & Working Principle
A bag filter works by surface and depth retention. Fluid enters the housing and is forced through the filter bag from the inside out, so particulate is captured on the bag surface and inside its depth. Clean fluid leaves through the outlet while the bag holds the contaminant, and when the pressure differential climbs past the set point the bag is replaced and the housing is back in service in minutes.
▲ Inside-Out Filtration
Fluid flows from inside the bag outward, so the whole bag surface is the filter area and captured solids stay contained in the bag when it is lifted out. That is what keeps the changeover clean.
▲ Zero-Bypass Sealing
The bag is clamped at the collar so no fluid can slip past the seal and reach the outlet unfiltered. A bypassed seal is the single most common reason a filter housing appears to stop working.
▲ Quick-Open Cover
The housing cover opens without tools, so a bag change is a short interruption rather than a shutdown. On a multi-bag housing the bags can be changed one at a time while the rest keep filtering.
Precision Engineered Details
A bag filter is a simple device, and almost every field problem traces back to one of these three details rather than to the bag itself.
PBF Technical Parameters
The table below covers the two standard PBF housings. Both share the same retention range and pressure rating; choose by flow rate and connection size, and note that filter area is customizable from 1 to 100 square meters.
| Model | Filter Area (m²) | Working Pressure (MPa) | Max Temperature (°C) | Max Viscosity (Pa·s) | Connection |
|---|---|---|---|---|---|
| PBF25 | 0.25 | 0.6 | < 120 | ≤ 10 | DN25 |
| PBF50 | 0.5 | 0.6 | < 120 | ≤ 10 | DN50 |
Reference projects in your industry are available on request.
Our Manufacturing Advantages
🏢 Direct Source Factory
Shanghai Polyc Technology Co., Ltd. is not a reseller. Every PBF industrial bag filter is machined, assembled and tested at our Wuxi plant, so you buy at the factory price and speak directly to the engineers who built it.
✈️ 30–45 Days Fast Delivery
Standard models ship in 30–45 days from confirmed drawings, thanks to our integrated vertical in-house production lines.
🛡️ Strict Quality Control
Key welds, seals and running accuracy are inspected before assembly, and each machine is run at the factory before packing.
🔧 3-Year Global Warranty
Every unit is covered for three years, with remote video support and spare parts stocked for dispatch worldwide.
Target Application Spectrum
Bag filtration is used anywhere a finished liquid has to be cleared of oversize before it is packed or shipped. These are the four duties the PBF is specified for most often.
Coatings & Paints
Final filtration ahead of filling, where a single hard particle becomes a visible surface defect on a coated panel.
Printing Inks
Removing oversize pigment and skin ahead of the press, where one particle becomes a rejected print run or a blocked doctoring edge.
Adhesives & Resins
Clarifying resin solutions and finished adhesive, where gels and undissolved lumps would otherwise reach the customer.
Chemical Processing
SS316L filtration on liquid chemical streams where a corrosive duty rules out a standard housing, with bag grade selected to the retention target.
Need a Bag Filter Sized to Your Flow?
Send us your flow rate, viscosity and target retention — our engineers will size the housing and bag grade, confirm the connection and material, then quote directly from the factory.
Technical FAQ
Short answers to the questions plant engineers ask before specifying an industrial bag filter.