Filter bag
The core element of a bag filter: a needle-felt bag is fitted over a cage and secured in the tube sheet with a snap-band ring.
Ø120–160mm × 2–8 m
260 °Cglass fibre / PTFE
24–48 mo.service life
Scroll down to see how it works
Bag, snap band and venturi
A spring ring in the top cuff locks the bag into the tube-sheet hole — no bolts or clamps needed. The venturi and blowpipe above the tube sheet direct the pulse air into the bag.
- Polyester, PPS, Nomex, glass fibre, PTFE
- Welded or sewn seam
- Cage — galvanised or stainless
A bag can’t work without a cage
During filtration the flow presses the bag inwards — the cage holds it in shape. The venturi boosts the pulse, and a blowpipe runs above each row of bags.
Dust stays outside, the pulse knocks it off
Dusty gas surrounds the bag from outside: dust builds a cake on the surface, and clean gas rises up from inside the bag. A short pulse flexes the bag and drops the dust cake into the hopper.
- Cleaning on ΔP (saves 15–20% energy)
- Media chosen by gas temperature and composition
What we need for selection
Media is chosen by gas temperature and dew point; we also check the condition of the cages.
We make bags and cages for your filter
Send the tube sheet dimensions and gas composition — we select the media, seam type and cage and supply a complete set.
- Size
- Ø120–160 mm × 2–8 m
- Media
- Polyester 130 °C, PPS 190 °C, Nomex 200 °C, glass fibre 260 °C
- Membrane
- PTFE on request
- Top cuff
- Snap-band, clamp
- Cage
- Galvanised, stainless, silicone-coated
- Service life
- 24–48 months