Automatic Hydraulic Self-Cleaning Screen Filters  

  

 

Automatic Hydraulic 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-200

 

 

 

 

 

video - [ wmv 1.6 MB ]

 Standard Features:

• Minimum operating pressure: 2,5 bars (36 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: 50 - 3000 microns
• Control voltage: 9V DC, 12V DC, 24V AC
• Flush water consumption (at minimum working pressure):
                                                          o Bell 2"-4" = 8 liters (2,11 gallons) 
                                                          o Bell 4"S-8"=25 liters (6,66 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-200 Series Self-Cleaning Filter

Filtration     

Water enters the filter through the "Inlet" 9. The water then reaches the fine screen 11, 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 11  and its external section.

 

Cleaning Process

When the difference in pressure (?P) reaches the preset value on the differential pressure indicator 5, a series of events is triggered while water continues to flow to the system units. The flushing valve 12  opens, pressure is released from the hydraulic piston 1, and water flows outside. Pressure in the hydraulic motor chamber 2  and the dirt collector 8  is significantly lowered, and the dirt collector nozzles 7   begin a suction process. The water flows through the hydraulic motor 6, which rotates the dirt collector 8  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 the linear movement and rotation significantly cleans the whole internal screen surface. The flushing cycle takes 5 seconds. The flushing valve 12   closes at the end of the cycle and the increased water pressure returns the system 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 5, that closes a circuit and triggers the electronic control unite 4  that controls the opening and the closing of the flushing valve 12  via the solenoid valve 3. The flushing cycle, which takes a total of 5 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.

 

 

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

 

 

 

 

 

 

 

 

 

 

 

SERIES AF-800

 

 

 

 

 

Standard Features:

• Minimum operating pressure: 2,5 bars (36 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: 9V DC, 12V DC, 24V AC
• Flush water consumption (at minimum working pressure): 80 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, 3- 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
    *         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-800 Series Self-Cleaning Filter

video - [ wmv 2.2 MB ]

Filtration

Water enters the filter through the "Inlet" 12 and passes through the coarse screen 13  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.

 

Cleaning Process

When the difference in pressure (?P) reaches the preset value in the electronic control unit 2, a series of events is triggered while the water continues to flow to the system units. The flushing valve 5  opens, pressure is released from the hydraulic piston 6 and water flows outside. Pressure in the hydraulic motor chamber 8  and the dirt collector 11  is significantly lowered, and the dirt collector nozzles 8  begin a suction process. The water flows through the hydraulic motor 8  which rotates the dirt collector 11  around its axis. The pressure released from the piston 6  and the high pressure inside the filter cause linear movement of the dirt collector. The combination of the linear movement and rotation significantly cleans the whole internal screen 9  surface.

The flushing cycle takes about 10 seconds. The flushing valve 5  closes at the end of the cycle and the increased water pressure returns the hydraulic piston 6  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 electronic system 2 controls the cleaning process based on time difference (DT) and / or through the differential pressure indicator - 3  (DP), that close a circuit and triggers the electronic control unit after delay of 15 seconds. The electronic control unit 2 controls the opening and the closing of the flushing valves 5  via the solenoid valve 1. The flushing cycle, which takes a total of about 10 seconds (can be adjusted by the operator), resumes its operation whenever the time cycle ends or the difference in pressure reaches the preset pressure value set in the controller. If the difference in pressure remains unchanged after one cycle, another cycle will start after a delay of 25 seconds.

 

 

Legend:    1. Solenoid Valve    2. Electric Control Unit    3. Differential Pressure Indicator    4. Suction Nozzle    5. Hydraulic Flushing Valve    6. Hydraulic Piston    7. Flushing Chamber    8. Hydraulic Motor    9. Fine Screen  10. Outlet  11. Dirt Collector  12. Inlet  13. Coarse Screen