Self Cleaning Screen Filters

 

Suction type automatic self cleaning screen filter

The suction type self cleaning screen filter is an easy-to-operate automatic plastic filter, with a self-cleaning mechanism driven by an electric motor. The filter is designed to work with various types of screens in filtration degrees ranging from 10 to 500 micron.

Taf filter

Filtering process:

Raw water enters the filter though the inlet valve into the screen cylinder. The raw water then passes through the filter from the inside out. Trapped dirt then forms a filter cake on the screens internal surface causing a differential pressure. The filter screen can be cleaned by continuous flushing or the cycle can be initiated by a predetermined time or differential pressure.

The Self-Cleaning Process:

The suction type self cleaning screen filter will start the self-cleaning process either when the pressure differential across the screen reaches a pre-set value or after a predetermined lapse of time. The fine screen filter element is cleaned by the suction scanner whose nozzles spiral across the inner surface of the screen. The filtration cake is “vacuumed” from the screen and expelled out the exhaust valve. The scanner’s spiral motion is achieved by a drive unit which rotates a bi-directional continuous worm shaft. The exhaust valve is activated For the duration of the cleaning cycle by a 3-way solenoid. Filtered water continues To flow downstream during the flush cycle, which takes approximately 16 seconds.

 

Electric automatic self cleaning screen filter

With the electric automatic self cleaning screen filter comes a series of automatic cleaning filters, designed for filtration of poor quality water to very fine filtration rates. The filter is automatically cleaned by suction scanners when a pressure differential (typically 0.5 bar) is sensed. The suction scanners vacuum the inside of the screen’s surface and  flush  any debris out the exhaust, using less than 1% of the total flow and without interrupting output. Filtration degrees between 10 and 800 micron and flow rates of up to 400 m3/h can be achieved. Higher flow rates can be achieved by banking multiple units.

SAF Filter 1

Filtering process:

Raw water enters the filter inlet through a coarse filter. This removes any large debris which may damage the suction scanners. Water then proceeds through the fine screen cylinder from the inside out. This causes particulates to accumulate on the inside surface of the screen, progressively developing a filter cake. The filter cake in turn then traps particles much smaller than the aperture of the screen. Effluent leaves the filter through the outlet.

An adjustable Pressure Differential Switch (PDS) continuously senses the pressure differential across the filter screen. The PDS signals the filter controller to initiate the cleaning cycle of the filter at a predetermined setting.

 The Self-Cleaning Process:

Once the cleaning cycle is initiated the exhaust valve opened and a suction scanner is activated. The driving mechanism then rotates the patented suction scanner in a slow fixed rotation while simultaneously moving the scanner linearly. The exhaust valve causes a high velocity suction stream at the nozzle tip, which cleans the inner surface as the suction scanner spirals across the screen. The downstream flow is uninterrupted during the cycle, which is completed in 20-40 seconds.

 

Heavy duty automatic self-cleaning screen filters for high loads of suspended solids

With the heavy duty range of automatic self cleaning screen filters comes a series of heavy duty filters with automatic cleaning, designed for filtrates with high content of suspended solids and high flow rates. When a differential pressure is sensed the cleaning cycle is initiated and two stainless steel brushes remove debris from the filter screen. The debris is then flushed out of the exhaust, using less than 1% of the total flow and without interrupting output. Filtration degrees are between 200 and 3500 micron with flow rates of up to 7200 m3/h . Higher flow rates can be achieved by banking multiple units.

ABF

Filtering process:

Raw water flows from the inlet into the screen cylinder. The water then flows through the screen, from the inside out, and continues downstream. Trapped dirt particles form a filtration cake on the inner surface, causing a differential pressure (typically 0.5 bar / 7 psi). A signal is the sent to the control unit which activates the cleaning process.

The Self-Cleaning Process:

The control unit activates the cleaning cycle by opening the exhaust valve and starting the drive unit. The drive unit rotates two stainless steel brushes which sweep the inner surface of the screen. Dislodged particles are then flushed out the exhaust valve. The downstream flow continues throughout the cleaning cycle which lasts between 15-30 seconds

 

Fine filtration automatic self-cleaning screen filters

With the fine filtration range of automatic self cleaning screen filters comes a series of robust and reliable filters with automatic cleaning, designed for filtration of poor quality water with high flow rates. The filter is automatically cleaned by suction scanners when a pressure differential (typically 0.5 bar) is sensed. The suction scanners vacuum the inside of the screen’s surface and flush any debris out the exhaust, using less than 1% of the total flow and without interrupting output. Filtration degrees between 10 and 800 micron with flow rates of up to 7200 m3/h. Higher flow rates can be achieved by banking multiple units.

EBS

 Filtering process:

Raw water flows into the filter through the inlet. Water then passes through the screen cylinder from the inside out. This causes particulates to accumulate on the inside surface of the screen, progressively developing a filter cake. The filter cake in turn then traps particles much smaller than the aperture of the screen. Effluent leaves the filter through the outlet. An adjustable pressure differential switch continuously senses the pressure differential across the filter screen. The  pressure differential switch signals the filter controller to initiate the cleaning cycle of the filter at a predetermined setting.

The Self-Cleaning Process:

Once the cleaning cycle is initiated the exhaust valve opens and a suction scanner is activated. The driving mechanism then rotates the suction scanner in a slow fixed rotation while simultaneously moving the scanner linearly. The exhaust valve causes a high velocity suction stream at the nozzle tip, which cleans the inner surface as the suction scanner spirals across the screen. The downstream flow is uninterrupted during the cycle, which is completed in approximately 30 seconds

 

 

Hydraulic self cleaning screen filters

The hydraulic self cleaning screen filter series are mid-range efficient filters with automatic hydraulic cleaning. Ideal for remote applications where power is unavailable. When a pressure differential (typically 0.5 bar) is sensed the cleaning cycle is initiated.  The cleaning nozzles spiral across the inside of the screens surface and vacuum any debris. The debris are then flushed out the exhaust, using less than 1% of the total flow and without interrupting output. Filtration degrees between 80 and 500 micron with flow rates of up to 400 m3/h. Higher flow rates can be achieved by banking multiple units.

M100-2

The Filtering Process:

Raw water enters the filter inlet through a coarse filter. This removes any large debris which may damage the cleaning mechanism. Water then proceeds through the fine screen cylinder from the inside out and flows downstream. This causes particulates to accumulate on the inside surface of the screen, progressively developing a filter cake. The filter cake in turn then traps particles much smaller than the aperture of the screen. Effluent leaves the filter through the outlet. Once the differential pressure reaches a predetermined pressure the rinse controller activates initiates the cleaning cycle.

The Self-Cleaning Process:

When the cleaning cycle is initiated the exhaust valve is opened. The low pressure causes the back-flush water to flow through the cleaning nozzles and along the central collector to the turbine. This causes the assembly to rotate across the inside of the screen and vacuum the filter cake of the internal surface. Debris is then expelled through the exhaust valve. Once the pressure across the screen drops to a adequate level the exhaust valve closes.