Self Cleaning Filters from Pelmar Engineering

Self Cleaning Filters Model E With Piston Operated Scanner
  • Minimum operating pressure: 14.5 psi
  • Maximum operating pressure: 145 psi
  • Clean filter pressure loss: 1.45 psi
  • Maximum water temperature: 149ºF
  • Filtration range Model E: 50 – 3000 micron
  • Filtration range Model EC: 400 – 3000 micron
  • Electric motor: 3-phase 0.5 Hp
  • Flush water consumption (at minimum working pressure): 18.5 gallons
  • Filter housing materials: carbon steel coated with baked on epoxy

Water enters the filter through the "Inlet" (1) and passes through the coarse screen (2) that functions as a "fist stop" for rough particles. Water then reaches the fine screen (3), which further purifies the flow by separating smaller particles from the water. As more water flows through, impurities build up on the fine screen. As impurities on the screen accumulate, a pressure imbalance is built up between the internal screen of the fine screen (3) and its external section.

Operation Information for Model EC Self Cleaning Electric Screen Filter
The process is the same as the above however there is no pre-filtration with a coarse screen (2) as the filtration grade is 400 – 3000 microns.

Cleaning Process
When the difference in pressure reaches the preset value on the differential pressure indicator, a series of events is triggered while water continues to flow to the systems units. The controller transmits a signal for a 10 second flushing cycle. The flushing valve (4) opens, pressure is released from the hydraulic piston (5) and water flows outside. Pressure in the hydraulic chamber (6) and the dirt collector (7) is significantly lowered resulting in a suction process via the suction nozzles (8) to the dirt collector and from there to the hydraulic chamber through the flushing valve (4) outside. The electric motor (9) simultaneously rotates the dirt collector (7) around its axis. The pressure is released from the piston (5) and the high pressure inside the filter causes linear movement of the dirt collector. The combination of the linear movement and rotation efficiently cleans the entire internal screen (3) surface.


At the end of the 10 second cycle the flushing valve (4) closes and the operation of the electric motor(9) is stopped. The increased water pressure returns the hydraulic piston (5) to its initial position. The filter is now ready for the next cycle, with clean and filtered water flowing through the "Outlet" (10).

The 10 second flushing cycle resumes operation whenever the difference in pressure reaches the preset pressure value set on the differential pressure indicator. If the pressure difference remains unchanged after one cycle, another cycle will start after a delay of 10 seconds.

Special Options and Features of Self Cleaning Filters

  • High Pressure Rating psi: 232, 352, 580
  • Electric Current: 110V, 220V, 3 phase, single phase, 24V and solar energy
  • High Temperature Range: Withstands temperatures up to 203ºF
  • Anti Frost: Special control system for cold climate conditions
  • Stainless Steel Grades: 304 and 316
  • Available Controls: Electronic, timer, air-actuated, computerized and custom designed
  • Special Coating – Prevents deterioration from exposure to sale/sea water

Sectors Served
Self Cleaning Filters are used in a wide range of applications in the Agricultural, Industrial, Municipal and Commercial sectors. The main industries include: steel mills, petroleum, plastics, chemicals, electronics, textile, paper mills, food, beverage and power stations.

Typical applications of Self Cleaning Filters include: cooling towers, heat exchanger protection, ion exchange protection, industrial wastewater recycling, effluent polishing water supply and filtration for micro irrigation.

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