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SAF series automatic self-cleaning filters


  • High flow rates – up to 400 m³ / h
  • Large filter area – 1500, 3000, 4500 en 6000 cm²
  • Minimal water waste during flushing – less than 1%
  • Filtration degrees – 800 to 10 micron
  • Two cleaning methods – nozzle (with spring) or standard
  • Flushing according to differential pressure and / or according to time. Possibility of continuous flushing (temporary). Minimal water consumption during cleaning. No interruption during the automatic cleaning process
  • Flexibility of control options – electronically monitored cleaning cycle
  • Wide range of applications: municipal water supply systems, cooling water, wastewater treatment, industrial pre-filtration, membrane protection, irrigation systems
  • Ideal for pre-filtration of membrane systems

 

The SAF filter series are advanced, but easy to operate automatic filters, with a self-cleaning mechanism driven by an electric motor.

Flow rates: up to 400m³/h (1,760 gpm)
Filtration degrees: 800 – 10 micron
Water for cleaning: less than 1% of the total flow
Minimum working pressure: 2 bar (30 psi)

How it works

GENERAL

The SAF filters are technically advanced, yet easy to operate automatic filters. The self-cleaning mechanism is driven by an electric motor. The “SAF” filters support flow-rates of up to 400 m³/h (1,760 gpm), with various screens designed to cover a range of filtration degrees, from 800 to 10 micron, and are available in inlet/outlet diameters of 2” to 10”.

 

THE FILTRATION PROCESS

The water is passed through a coarse filter[2] into the filter (from outside to inside)[1]. Through the fine filter[3], the water leaves the SAF (from inside to outside). The filter cake collects on the inside of the fine filter, increasing the resistance across the filter. The coarse filter protects the cleaning mechanism from coarse dirt.

The SAF filter begins self-cleaning operation once the resistance across the fine filter exceeds a set value (differential pressure switch[6]) or when a set time has elapsed.

 

THE SELF-CLEANING PROCESS

The filter screen is cleaned by the suction nozzles[5], which rotate in a spiral motion, sucking the filter cake from the filter screen and draining it through the flush outlet. During this cleaning, which takes 15-40 seconds, the filter continues to operate normally and filtered water is diverted through the outlet[4].

Operation and monitoring is done by PLC (Programmable Logic Controller). The PLC allows maximum operation flexibility and provides a wide range of control options from an independent stand-alone unit up to full integration within the customer’s central control system.

Initiation of self-cleaning process:

  • Flushing by pressure differential – DP analog or digital signal
  • Flushing by time intervals
  • Continuous flushing – regardless of DP or time
  • Remote or local manual start

 

The PLC also provides:

  • Flush cycle counter
  • Cause of flushing statistics
  • Faults and alarms, reaction and messages

 

SAF models
SAF 1500 for flow rates up to 80 m³/h (350 gpm)
SAF 3000 for up to 150 m³/h (660 gpm)
SAF 4500 for up to 250 m³/h (1,100 gpm)
SAF 6000 for up to 400 m³/h (1,760 gpm) (

SAF 1500 automatic self-cleaning filters
technical drawing SAF1500 automatic self-cleaning filters

Dim: mm (inch)

Pressure Loss Graph – in clean water

SAF 3000 automatic self-cleaning filters
technical drawing SAF 3000 automatic self-cleaning filters

Dim: mm (inch)

graph SAF 3000 automatic self-cleaning filters

Pressure Loss Graph – in clean water

SAF 4500 automatic self-cleaning filters
technical drawing SAF 4500 automatic self-cleaning filters

Dim: mm (inch)

graph SAF 4500 automatic self-cleaning filters

Pressure Loss Graph – in clean water

SAF 6000 automatic self-cleaning filters
SAF 6000 automatic self-cleaning filters

Dim: mm (inch)

SAF 6000 graph automatic self-cleaning filters

Pressure Loss Graph – in clean water

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Technical specifications SAF

Technical specifications
Technical specifications SAF filters