Automatic Electric Self-Cleaning Screen Filters  

 

 

Automatic Electric Self-Cleaning Screen Filters are used by customers in a wide range of applications throughout Industry, the Public Sector and Agriculture. Automatic hydraulic screen filters applications include raw water filtration, water recycling, cooling tower water treatment, main line filtration, and condense water filtration.

 

 

Typical applications:

• Industrial Water Treatment, Filters & Recycling
• Cooling towers
• Industrial Wastewater Treatment
• Public & Private Sector Drinking Water Treatment
• Public & Private Sector Compact Wastewater
• Filtering for Agriculture Irrigation & Greenhouses

 

 

Automatic Self-Cleaning Filters are used in Agriculture for the main and secondary filtration, drop irrigation, mini and micro sprinkler systems and other applications in the distribution of water.

 

 

SERIES AF-200E

 

 

 

 

 

 

Standard Features:

• Minimum operating pressure: 1 bar (14,5 psi)
• Maximum operating pressure: 10 bars (145 psi)
• Clean filter pressure loss: 0,1 bar (1,45 psi)
• Maximum water temperature: 65°C (149°F)
• Filtration range: 10 - 3000 microns
• Control voltage: 380V, 3-phase, 1/8 HP
• Flush water consumption (at minimum working pressure):
                                                          o Bell 2"-4" = 7 liters (1,85 gallons)
                                                          o Bell 4"S-8"=17 liters (4,49 galllons)
• Filter housing materials: carbon steel coated with baked on epoxy
  
  

 Special Options and Features:

• High pressure range: 16 bars (232 psi)
• High temperature range: withstands temperatures up to 95°C (203°F)
• Anti frost: special control system for cold climate conditions
• Electric current: 110V, 230V, single phase, 24V and solar energy
• Construction materials: stainless steel 304 or 316, and titanium
• Available controllers: electronic, timer, air-actuated, computerized and custom designed

 

Pressure Loss at 120 Micron

     S = Filter with large filtration area
     *    Flow rate data is for high quality water at filtration grade of 120 micron
    **  Flushing flow rate data is for minimum operational pressure (1.5 bar / 22 psi)
                      

     

Operation Information for AF-200E Series Self-Cleaning Filter

 

Filtration

Water enters the filter through the "Inlet" 7. The water then reaches the fine screen 6, which 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 6  and its external section.

 

Cleaning Process  
When the difference in pressure (?P) reaches the preset value on the differential pressure indicator 11, a series of events is triggered while water continues to flow to the system units. The controller transmits a signal for a 5 second flushing cycle. The flushing valve 3  opens, pressure is released from the hydraulic piston 1  and water flows outside. Pressure in the flushing chamber 4  and the dirt collector 2  is significantly lowered resulting in a suction process via the suction nozzles 8  to the dirt collector 2  and from there to the flushing chamber 4  through the flushing valve 3   outside. The electric motor 12  simultaneously rotates the dirt collector 2   around its axis. The pressure is released from the piston 1  and the high pressure inside the filter causes vertical movement of the dirt collector. The combination of the vertical movement and rotation efficiently cleans the entire internal screen 6  surface.

 

General Description of the Electronic Control System

At the end of the 5 second cycle the flushing valve 3  closes and the operation of the electric motor 12  is stopped. The increased water pressure returns the hydraulic piston 1  to its initial position. The filter is now ready for the next cycle, with clean and filtered water flowing through the "Outlet" 5.
The 5 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 15 seconds. 

 

Legend:     1. Hydraulic Piston     2. Dirt Collector     3. Hydraulic Flushing Valve     4. Flushing Chamber     5. Outlet     6. Fine Screen     7. Inlet     8. Suction Nozzle     9. Solenoid Valve   10. Electric Connection Box   11. Differential Pressure Indicator   12. Electric Motor

 

 

 

 

SERIES AF-900

 

 

 

 

Standard Features:

• Minimum operating pressure: 1 bar (14,5 psi)
• Maximum operating pressure: 10 bars (145 psi)
• Clean filter pressure loss: 0,1 bar (1,45 psi)
• Maximum water temperature: 65°C (149°F)
• Filtration range: 10 - 3000 microns
• Control voltage: 380V, 3-phase, 0,5 HP
• Flush water consumption (at minimum working pressure): 45 liters
• Filter housing materials: carbon steel coated with baked on epoxy
• Control system: PLC electric control board
  
  

 Special Options and Features:

• High pressure range: 16, 25, 40 bars (232, 362, 580 psi)
• High temperature range: withstands temperatures up to 95°C (203°F)
• Anti frost: special control system for cold climate conditions
• Electric current: 110V, 230V, single phase, 24V and solar energy
• Construction materials: stainless steel 304 or 316, and titanium
• Available controllers: electronic, timer, air-actuated, computerized and custom designed

 

Pressure Loss at 120 Micron

    PR = Parallel
    *       Flow rate data is for high quality water at filtration grade of 120 micron
   **     Flushing flow rate data is for minimum operational pressure (1 bar / 14,5 psi)

 

 

Operation Information for AF-900 Series Self-Cleaning Filter

 

Filtration  

Water enters the filter through an "Inlet" 6  and passes through the coarse screen 7  that functions as a "first stop" for rough particles. Water then reaches the fine screen 8   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 8  and its external section.    

 

Cleaning Process 

When the difference in pressure (?P) reaches the preset value on the differential pressure indicator, a series of events is triggered while water continues to flow to the system units. The flushing valve 3  opens, and water flows outside. Pressure in the hydraulic flushing chamber and the dirt collector 5  is significantly lowered resulting in a suction process via the suction nozzles 4 t o the dirt collector 5  and from there through the flushing valve 3. The electric motor 1  simultaneously rotates the dirt collector 5  and moves it along its axis. The combination of the linear movement and rotation significantly cleans the whole internal screen 8  surface.  

 

The flushing cycle continues as long as the pressure difference between the inlet and outlet remains the same and according to signals from the controller. If the pressure difference remains unchanged for a fixed preset time, the emergency flushing valve 2  opens along with the normal flushing valve 3. The flushing cycle continues for an additional fixed time that was preset on the controller. The flushing valve 2  & 3  closes when the pressure difference on the Pressostat drops. The operation of the electric motor is stopped after the collector axis reaches the internal or external limit switches. The filter is now ready for the next cycle, while clean and filtered water flows through the "Outlet" 9.                                                                  

 

Legend:           1. Electric Motor           2. Emergency Flushing Valve           3. Hydraulic Flushing Valve           4. Suction Nozzle           5. Dirt Collector           6. Inlet           7. Coarse Screen           8. Fine Screen           9. Outlet

 

                                                                          

  

                                                                                                                                                                     

SERIES AF-9800

 

 

 

Standard Features:

• Minimum operating pressure: 1,5 bars (22 psi)
• Maximum operating pressure: 10 bars (145 psi)
• Clean filter pressure loss: 0,1 bar (1,45 psi)  
• Maximum water temperature: 65°C (149°F)
• Filtration range: 10 - 3000 microns
• Filtration range for model C: 400 - 3000 microns
• Control voltage: 380V, 3-phase, 0,5 HP
• Flush water consumption (at minimum working pressure): 70 liters
• Filter housing materials: carbon steel coated with baked on epoxy
  
  

Special Options and Features:

• High pressure range: 16, 25, 40 bars (232, 362, 580 psi)
• High temperature range: withstands temperatures up to 95°C (203°F)
• Anti frost: special control system for cold climate conditions
• Electric current: 110V, 230V, single phase, 24V and solar energy
• Construction materials: stainless steel 304 or 316, and titanium
• Available controllers: electronic, timer, air-actuated, computerized and custom designed

 

Pressure Loss at 120 Micron

    LO   = Long filter with large filtration area
    PR   = Parallel connection standard
    XLP = Extra long filter with extra large filtration area
    C     = Coarse Filtration only
    *         Flow rate data is for high quality water at filtration grade of 120 micron
   **        Flushing flow rate data is for minimum operational pressure (1.5 bar / 22 psi)

 

  

Operation Information for AF-9800 Series Self-Cleaning Filter

 

                                                                                                                               video - [ wmv 2.2 MB ]

 

Filtration

Water enters the filter through the "Inlet" 10  and passes through the coarse screen 2  that functions as a "first stop" for rough particles. Water then reaches the fine screen 9, 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 9  and its external section.

 

Operation Information for Model AF-9800 C

The process is the same as the above however there is no pre-filtration with a coarse screen 9  as the filtration grade is 400 - 3000 microns.

 

Cleaning Process

When the difference in pressure (?P) reaches the preset value on the differential pressure indicator, a series of events is triggered while water continues to flow to the system units. The controller transmits a signal for a 10 second flushing cycle. The flushing valve 5  opens, pressure is released from the hydraulic piston 7  and water flows outside. Pressure in the hydraulic chamber 6  and the dirt collector 3  is significantly lowered resulting in a suction process via the suction nozzles 4  to the dirt collector 3  and from there to the hydraulic chamber 6  through the flushing valve 5  outside. The electric motor 1  simultaneously rotates the dirt collector 3  around its axis. The pressure is released from the piston 7  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 9  surface.

 

At the end of the 10 second cycle the flushing valve 5  closes and the operation of the electric motor 1  is stopped. The increased water pressure returns the hydraulic piston 7  to its initial position. The filter is now ready for the next cycle, with clean and filtered water flowing through the "Outlet" 8.

 

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.

 

 

Legend:         1. Electric Motor        2. Coarse Screen        3. Dirt Collector        4. Suction Nozzle        5. Hydraulic Flushing Valve        6. Flushing Chamber        7. Hydraulic Piston        8. Outlet        9. Fine Screen      10. Inlet

 

 

 

SERIES AF-7500/700

 

 

 

 

Standard Features:

• Minimum operating pressure: 1 bar (14,5 psi)
• Maximum operating pressure: 10 bars (145 psi)
• Clean filter pressure loss: 0,1 bar (1,45 psi)
• Maximum water temperature: 65°C (149°F)
• Filtration range: 200 - 3000 microns
• Control voltage: 380V AC, 3-phase
• Flush water consumption (at minimum working pressure): 45 liters
• Filter housing materials: carbon steel coated with baked on epoxy
• Available connections: 90°, 180°
  
  

Special Options and Features:

• High pressure range: 16, 25, 40 bars (232, 362, 580 psi)
• High temperature range: withstands temperatures up to 95°C (203°F)
• Anti frost: special control system for cold climate conditions
• Electric current: 110V, 230V, single phase, 24V and solar energy
• Construction materials: stainless steel 304 or 316, and titanium
• Available controllers: electronic, timer, air-actuated, computerized and custom designed

 

Pressure Loss at 120 Micron

    *   Flow rate data is for high quality water at filtration grade of 120 micron
    ** Flushing flow rate data is for minimum operational pressure (1 bar / 14,5 psi)

 

 

Legend:       1. Electric Motor       2. Brush       3. Fine Screen       4. Inlet       5. Flushing Valve       6. Outlet