viscous filter

Viscous or Paste Filter


Viscous or Paste Filter


Viscosity is a major factor in industrial filtration. With flow rate and filtration rating, they are key elements in the selection of an industrial filter. The more viscous a product is, the more complicated it is to get it through a filter.

A viscous filter is ideal for removing solid particles from highly viscous or pasty materials. Filters such as these not only remove solids, but they also ensure that the feed slurry is mixed uniformly inside the filter, since the filter element keeps rotating during filtration.

It consists of mainly four parts

  • Drive assembly – consists of a geared motor mounted on a motor stool. The motor shaft is connected to the shaft extending from the filter element by a rigid coupling
  • Intermediate assembly – It has input and outlet nozzles on the same axis and is flanged on both sides. The filtered and unfiltered paste are separated by the inner pipe, to which the outlet nozzle is welded. The inner pipe supports the scraper assembly, which includes a blade holder and nylon blades.
  • Filter element – It is made of welded wedge wire and is constructed in a self-supporting way. It’s essentially a filter element that doesn’t clog and has a smooth filtering surface. The filter element is supported by the intermediate assembly’s inner pipe.
  • Filter housing- Stainless steel is used in most cases, and a jacket can be added. The bottom of the housing will have a drain valve, and the top will have a flanged end for bolting to the intermediate assembly.


The filter’s intake nozzle allows unfiltered paste to enter the filter. When the bottom drain valve is closed, water flows from the outside to the inside of the filter element due to the pumping pressure. Filtered paste exits through the output nozzle, but solid particles (bigger than the element’s filtration gap) remain outside the filter element. During filtration, the geared drive should be maintained on, and while the filter element rotates against the stationary scraper, the filtering surface of the element should be cleaned continually.

With the drop in flow rate, pressure begins to rise as solid particles gather inside the housing. Once the maximum operating pressure has been reached, the filter should be turned off and the geared drive should be turned off as well. Drain the solid-particle-concentrated paste through the drain valve. Remove the housing, clean the element, then replace it. The complete process of removing and replacing the housing will only take a few minutes. Housing can also be flushed with water without having to remove it.

Features & Benefits

  • Constant high cleaning efficiency and pressure drop
  • Minimum maintenance
  • Low working cost
  • Easy installation
  • Non clogging type metallic wedge wire filter element
  • Non-metallic scrapers
  • Light weight housing; easy maintenance
  • Fine filtration
  • Fixed scraper & rotating element


  • Oil
  • Chemical plants
  • Tooth paste
  • Shaving cream
  • Gums & glues
  • Grease
  • Pastes & syrups
  • Jelly products
  • Dispersions
  • Emulsions
  • Lacquers
  • Colors

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