Fully automatic backwashing filtration systems are widely used inmodern chemical production plants. They integrate with electricalsystems, instrumentation, and valves to achieve automatic filtration andbackwashing operations, controlled by a DCS or PLC system. The systemcan be designed as a single filtration unit or an A/B switching filtrationsystem. The filter uses sintered metal membrane materials as thefiltration element, effectively filtering and removing micron orsub-micron particles from the liquid. A differential pressure gaugemonitors the system in real time, and core technology is used to ensurethe regeneration of the metal membrane.
Backwash process runs automatically without shutdown, ensuringcontinuous filtration and stable system performance.
Filtration continues during backwashing, preventing downtime andimproving overall production efficiency.
Reduced manual cleaning and fewer replacement parts significantlylower operating and maintenance expenses.
Effectively removes solid particles, protecting downstream equipmentand improving process reliability.
Designed for harsh industrial conditions with durable materials and longservice life.
The Unite automatic backwashing filtration system consists of multipleparallel 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 becomesincreasingly difficult to penetrate the filter elements, and the pressuredifference increases. When the pressure difference or operating timereaches 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 |
An Automatic Backwash Filtration System is a self-cleaning filtration unit that removes particles from liquid streams by periodically reversing flow through the filter element. This backwashing process cleans the filter without shutting down the system.
The system continuously filters process fluid through a filter element. When pressure drop reaches a preset level or a timed cycle is triggered, the system automatically initiates backwashing, flushing accumulated contaminants out of the filter while maintaining operation.
Key advantages include continuous operation without downtime, reduced maintenance costs, lower labor requirements, extended filter life, and stable filtration performance even under high solid loads.
These systems are widely used in water treatment, petrochemical, oil & gas, power generation, metallurgy, and industrial process filtration where continuous and reliable solid-liquid separation is required.
Yes. The backwash cycle can be configured based on pressure differential, time interval, or manual trigger. System parameters such as backwash duration, frequency, and flow rate can also be adjusted according to process requirements.
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