An automatic backwashing filter is a high-efficiency filtration system designed to remove suspended solids and particulate contaminants from water and other compatible liquids. Using an automated cleaning mechanism, it helps maintain consistent filtration performance while reducing the need for manual maintenance.
During normal operation, the liquid passes through the filter element, where suspended particles are retained on the filtration surface. When the accumulated contaminants reach a preset differential pressure or cleaning threshold, the system automatically initiates a backwashing cycle. Clean liquid flows in the reverse direction through the filter element, dislodging accumulated impurities and discharging them through the drain. Once cleaning is complete, the filter automatically resumes normal operation, supporting continuous filtration with minimal operator intervention.
As a type of self-cleaning filter, an automatic backwashing filter offers an effective solution for applications that require reliable filtration and automated contaminant removal. Depending on the filter design and operating conditions, it can be used in industrial water treatment, wastewater pretreatment, irrigation, and process water systems. Its automated cleaning process helps reduce manual intervention and maintenance requirements, making it a practical choice for industrial applications where operational efficiency and filtration reliability are essential.
The fully automatic backwashing filter operates by continuously filtering water while automatically removing accumulated contaminants from the filter element. During normal operation, raw water passes through the filter element, where suspended solids and particulate impurities are retained on the filtration surface, allowing filtered water to flow downstream.
As contaminants accumulate, the differential pressure across the filter element gradually increases. When the preset differential pressure threshold is reached, or another configured cleaning condition is triggered, the control system initiates the backwashing cycle. Clean filtered water flows in the reverse direction through the filter element, dislodging accumulated impurities and carrying them out through the drain outlet.
Once backwashing is complete, the system returns to normal filtration mode automatically. This cyclic process enables the automatic backwashing filter to remove retained contaminants without routine manual cleaning. As a type of self-cleaning filter, it helps maintain consistent filtration performance and reduce manual intervention during operation. Actual cleaning sequences and operating continuity depend on the specific filter design.
The fluid containing suspended solids and other impurities enters the lower chamber (1) of the fully automatic backwash filter. As the fluid velocity decreases, the liquid flows upward and passes from the inside to the outside through the specially arranged and sealed filter element assemblies (2). Impurities are retained on the inner surfaces of the filter elements, while the filtered liquid flows out through the outlet (3).
The backwashing process is driven by the pressure difference between the pipeline and atmospheric pressure. When the differential pressure reaches the preset threshold, the motor (5) drives the backwashing suction device (4) to rotate, and the drain valve (6) opens. Connecting the drain outlet to the atmosphere creates a pressure differential that causes clean filtered liquid on the outer side of the filter elements to flow backward through them. This reverse flow dislodges accumulated impurities from the inner surfaces, and the contaminants are discharged through the drain outlet.
The backwashing suction device cleans the filter element assemblies sequentially, with the cleaning dwell time for each assembly adjusted according to the characteristics of the contaminants. Once the differential pressure returns to its preset level, the drain valve closes and the motor stops. The filter then continues normal filtration operation.
This automatic backwashing process enables continuous filtration with low backwash water consumption and minimal impact on outlet pressure. The control system (7) supports remote operation through a Distributed Control System (DCS), and the backwashing interval and duration can be adjusted according to actual operating requirements.
Fluid enters the filter and solid particles are captured by the filter element.
When preset pressure or time is reached, the system automatically initiates backwashing.
Removed particles are flushed out through the drain outlet.
Differential pressure is continuously monitored to detect filter contamination.
Clean fluid flows in reverse direction to remove trapped contaminants from the filter surface.
The system resumes normal filtration without interrupting operation.
| Standard design pressure level | 1.6MPa、2.5MPa、4.0MPa |
| Maximum design temperature | 0 - 250°C (depending on seals) |
| Precision range | 1~100μm |
| Filter unit valve size | 1~20″ |
| Filter unit filtration area | 1~60m² |
| Backwash pressure difference | 50KPa - 200KPa |
| Alarm pressure difference | < 200KPa |
| Main pipe inlet and outlet size | DN80 - DN500 |
| Main pipe inlet and outlet flange type | Loose flange or customer - specified |
| Main pipe inlet and outlet connection standard | HG/T20592 - 2009 (standard, compatible with DIN), HG/T20615 - 2009 (compatible with ANSI B16.5) |
| Filter element type and material | V - SLOT gap - type metal filter element, material 304/316L/duplex stainless steel |
| Shell liquid - contacting material | CS/304/316L/duplex stainless steel/titanium |
| Shell sealing material | NBR nitrile rubber (standard)/VITON (FKM) fluororubber |
| Fluid control valve | Pneumatic ball valve, protection class IP65/IP65, valve seat material PTFE |
| Utility supply requirement | AC220V, 0.4 - 0.6MPa clean and dry compressed air |
| Control system | Siemens PLC, S7 - 200, S7 - 1500 series, voltage 24V, IP55/IP65 |
| Pressure difference sensor | Pressure transmitter/pressure difference transmitter |
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An automatic backwash filter removes suspended solids and particulate contaminants by passing liquid through a filter element. When the preset differential pressure or cleaning condition is reached, the system initiates a backwashing cycle to remove accumulated impurities and discharge them through the drain outlet. The filter then returns to normal operation automatically, reducing the need for manual cleaning.
The filtration rating of an automatic backwash filter depends on the filter element design, liquid properties, and application requirements. Selection may range from coarse particle removal to finer filtration, depending on the specific model. When choosing an industrial automatic backwash filter, consider the target particle size, required filtration efficiency, flow rate, and allowable differential pressure.
Automatic backwash filters are commonly used in industrial water treatment, cooling water systems, irrigation, and process water filtration. They are suitable for applications where suspended solids need to be removed automatically to protect downstream equipment and reduce manual maintenance. The filter should be selected according to the liquid composition, contaminant characteristics, operating pressure, and required filtration rating.
An automatic backwash filter typically removes accumulated contaminants by reversing the liquid flow through the filter element. A brush-type self-cleaning filter uses a mechanical brush to clean the filtration surface. Both are designed to reduce manual cleaning, but their suitability depends on the particle characteristics, filter element design, and operating conditions. The appropriate option should be selected based on the actual filtration requirements.
To select the right automatic backwash filter for industrial water treatment, evaluate the required flow rate, filtration rating, operating pressure, liquid temperature, suspended solids concentration, and material compatibility. It is also important to consider the backwashing method, cleaning water consumption, drainage capacity, and available installation space. Providing these operating parameters to the manufacturer helps identify a suitable filter model or customized filtration solution.
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