Automatic Self Cleaning Water Filters from Pelmar Engineering

Automatic Self Cleaning Water Filters Model H
  • Minimum operating pressure: 29 psi
  • Maximum operating pressure: 145 psi
  • Clean filter pressure loss: 1.45 psi
  • Maximum water temperature: 149ºF
  • Filtration range:
    50 – 3000 micron
  • Control voltage:
    12 VDC, 24 VAC
  • Flush water consumption (at minimum working pressure): 21 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 "first 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 section of the fine screen (3) and its external section.

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


The flushing cycle takes 10 seconds. The flushing valve (4) closes at the end of the cycle and 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).

General Description of the Electronic Control System
The electrical system controls the cleaning process through the differential pressure indicator, (11) that closes a circuit and triggers the electronic control unit (12) controlling the opening and closing of the flushing valves (4) via the solenoid valve (13). The flushing cycle, which takes a total of 10 seconds, resumes its operation whenever the difference in pressure reaches the preset pressure value set on the differential pressure indicator. If the difference in pressure remains unchanged after one cycle, another cycle will start after a delay of 25 seconds.

Special Options and Features of Automatic Self Cleaning Water Filters

  • High Pressure Rating psi: 232, 352, 580
  • High Temperature Range: Withstands temperatures up to 203ºF
  • Anti Frost – special control system for cold climate
  • Available controls – Electronic, timer, air-actuated, computerized and custom designed
  • Special Coating – Prevents deterioration from exposure to sale/sea water

Sectors Served
Automatic Self Cleaning Water 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 for Automatic Self Cleaning Water 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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