An automatic backwash filtration system is a self-cleaning industrial filter designed for continuous removal of solid particles from process liquids. Unlike traditional filters requiring frequent manual cleaning or replacement, the system automatically removes accumulated contaminants through backwashing without interrupting the filtration process.
By integrating differential pressure monitoring, automatic control valves, and efficient filtration elements, UNITE automatic backwash filters provide reliable filtration performance for demanding industrial applications.
Designed for high-flow and continuous industrial processes, UNITE automatic backwash filtration systems use multiple parallel filter units with sequential backwashing. While one filter group is cleaned, the remaining units continue filtration, helping maintain stable outlet flow and reduce process downtime. The system can be customized for cooling water, circulating water, process water, wastewater pre-filtration, and chemical process liquids.
The system automatically detects pressure differences caused by contaminant accumulation and initiates the cleaning process when required.
The unique design allows filtration operation to continue while the filter element is being cleaned, avoiding production interruption.
Optimized filtration structure provides high processing capacity with low pressure loss, suitable for large-scale industrial applications.
Efficient cleaning technology minimizes the amount of cleaning liquid required during the backwash process.
PLC-based control system enables automatic operation, monitoring, and easy integration with industrial control systems.
The Unite automatic backwashing filtration system consists of multiple parallel filtration units arranged in rows and groups. The normal flow isfrom outside to inside, while backwashing occurs from inside to outside.When the raw material passes through the filter vessel containing thefilter elements, particulate matter gradually deposits and accumulateson the outer surface of the filter elements, forming a filter cake. As thethickness of the filter cake increases, the liquid flow becomes increasingly difficult to penetrate the filter elements, and the pressure difference increases. When the pressure difference or operating time reaches a preset value, the raw material inlet valve of that group isclosed first, followed by the rapid opening of the backwashing valve. Clean filtered liquid is then used to create a pressurized flow from thetop to the bottom of the filter, dislodging the filter cake from the surfaceof the filter elements. The removed filter cake is discharged through thedrain line. After all the other groups in that row have been backwashed, the drain valve is closed, and the normal filtration process is resumed. The other rows are then backwashed in sequence.
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 |
Talk to Our Engineers to Get a Free, Customized Filtration Solution.
An automatic backwash filtration system is a self-cleaning filter that removes contaminants automatically without interrupting the filtration process.
The cleaning frequency depends on contamination level, flow conditions, and differential pressure settings.
For corrosive liquid applications, the filtration system can be manufactured with corrosion-resistant materials such as stainless steel 316L, stainless steel 304, and other suitable materials depending on the chemical properties of the medium. Material selection should be based on factors such as liquid composition, temperature, concentration, and operating conditions.
A backwash filtration system uses a reverse flow process to remove accumulated contaminants from the filter media or elements, allowing continuous operation without manual cleaning. A self-cleaning filter typically uses automatic mechanisms such as backwashing, scraping, or suction to clean the filter element during operation. The main difference lies in the cleaning method, filtration structure, and application requirements.
The flow rate depends on the filtration model, filter area, filtration accuracy, and process conditions. Industrial backwash filtration systems can be designed for a wide range of flow capacities to meet different application requirements. UNITE can provide customized filtration solutions based on the customer's required flow rate and operating conditions.
For a large chemical plant in the Dalian Development Zone, UNITE supplied a modular automatic self-cleaning filtration unit for high-flow circulating cooling-water purification and reuse. The system combines stainless-steel wedge-wire screens, motor-driven suction or brush cleaning, automatic blowdown, differential-pressure and timer triggers, PLC control, touchscreen monitoring, remote communication, and corrosion-resistant construction. The reported result was an extension of heat-exchanger cleaning and maintenance cycles by more than 50%, together with zero manual intervention for automatic blowdown.
This duplex system ensures continuous water flow via a twin-barrel design, effectively preventing nozzle and equipment clogging caused by high-impurity mine water in both underground and surface operations.
For the removal of suspended solids from bulk pharmaceutical chemicals, Heilongjiang Biopharmaceutical Factory has adopted the micron-grade fully auto
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