Automatic Backwash Filter is a universal device good for both high and low viscosity liquids.
For use in big (multi-storey) buildings, industrial and commercial estate, especially in the following systems:
- Central water supply
- Air conditioning
- Heating
- Irrigation installations;
- Water cooling before complex technological equipment;
- Feed water preparation for boilers;
- Pre-filtering for ultra-filtering, nano-filtering or reverse osmosis.
Liquid hydrocarbon purification, including the following:
- Diesel fuel;
- Petrol;
- Heating oil;
- Fuel oil;
- Lubricants (used motor, transmission lubricants, etc.)
Specifications
Cleaning backwash
Filtering range 5-500 µm
Max. operating pressure 1,6 MPa
Max. liquid temperature up to 180 °С
Filter element type slotted; corrugated sintered steel mesh
Filter element material stainless steel AISI304, AISI321, AISI316
Filter body material high-strength cast iron
Dimensions
| Filter’s dimensions | with Dn50 | With Dn80 |
| Body dia, mm | 240 | 240 |
| Height with a gear motor, mm | 980 | 979 |
| Width between flanges, mm | 446 | 502 |
| Height at mount location, mm | 360 | 360 |
| Height to flanges (inlet / outlet), mm | 574 | 574 |
| Filtering area, m2 | 0,368 | 0,368 |
| Pipe dia (inlet / outlet), G” | 2 | 3 |
| Washing pipe dia, G” | 1 | 1 |
| Drain hole dia, G” | 1 ¼ | 1 ¼ |
Equipment
| Filter equipment | Standard | Additional |
| Control panel | Mounted | Remote |
| Design | IP54 | As inquired |
| Drain valve | Manual | Driven |
| Backwash valve | Electrically driven | Pneumatically driven
Hydraulically driven |
| Connection to pipe for Dn 50 filters | Thread | Flange |
| Filtered delivered as | Without mounting frame | With mounting frame |
| Flanges installed | NoYes | |
| Power supply | 380V 50HZ | 220V 50HZ
24V DC |
Filter elements
We offer various filter elements depending on the filtered liquid:
- Corrugated sintered sheet metal fibers mesh
- + (pros):
- High dirt holding capacity;
- A small filtering resistance due to high filter area (3 times bigger area compared to plain filter);
- 30-60% of filter is clear area surface;
- Highly resistant to corrosion and abrasion.
- – (cons):
- Clay sediments can block the mesh, frequent backwash is required in this case.
- + (pros):
- Wedge wire filter
- + (pros):
- High strength;
- Washes effectively;
- Stable filtering range;
- Resistant to impurities.
- – (минусы):
- Small clear area surface (4% at 50µм) causes low output.
- + (pros):
Filter’s features:
- Minimum consumption of flushing liquid (under 2 %);
- Fully automatic;
- Can filter highly viscous liquids (up to 300 mm2/s);
- Cleans liquids with high solid particles content (up to 300 mg/l);
- Different backwash launch options: on pressure difference, on time, manually;
- Easy at service;
- High dirt holding capacity;
- Backwash system can be supplied by ascraper for better results;
- Explosion-proof and weather-resistant designs are available;
- Easy maintenance and low operating costs.
Filter operation description:
A filtered liquid enters the filter case via inlet pipe. The flow goes down and changes direction by 180 deg and contacts the filtering element’s surface. A filtered liquid leaves filter via outlet pipe.
An installed pressure sensor allows the system to estimate the filter contamination state and backwash it if the pressure difference is higher than normal (factory setting is 0.05 MPa). Optionally backwash is available in manual mode or by timer.
Backwash results from filtering element rotation and back pressure. Contaminants are removed via a drain pipe.
A cheaper version is manually-operated backwash. This option that allows you to minimize costs for non-critical or periodically operated filtration systems.
Such a filter requires a constant control and a presence of an operator. But it is cheaper and easier to mantain compared to drain filters.
Manually operated filter has two manually operated valves and a flywheel. A moment to start backwash is deterined by difference in two pressure gauge readings. As pressure difference reaches 0.05 MPa an operator opens the backwash valve and rotates the flywheel 2 or 3 times. When the pressure difference raches 0,01-0,015 MPa the valve must be closed. A drain valve should be opened at least for 2-5 seconds every day (depending on the filtered liquid contamination).
