Self-cleaning Industrial Water Filters and Strainers used for pumping dirty or contaminated water.
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RFLW filters are general purpose suction intake basket strainers with a built-in self-cleaning mechanism that back-washes their mesh as water flows through the screen. They are all stainless steel, high volume screens developed specifically to meet the challenges of EPA and Environment Agency regulations for raw water abstraction. Ideal for Eel screening and Fish protection.
The designation ‘RF’ indicates that the filter mesh is mm in diameter. Water is screened as it is drawn through the filter mesh, helping to prevent the intake, pump and any connected equipment from blocking.
These self-cleaning intake filters attach to the suction of surface mounted pumps, or can be used to screen water flowing by gravity. Here are some typical uses of these intake screens:
The difference between a self-cleaning intake screen or filter designated AR, and a self-cleaning intake screen or filter designated LW is in their construction.
‘AR' type strainers and filters are made with a cage frame around which filter mesh is wrapped. This is held in place by a clamp. The filters are easily identifiable as ’AR' type as filter mesh area comprises a series of mesh windows.
‘LW’ type strainers and filters do not have a cage body; the mesh is the filter body. The filter mesh is tensioned between the filter top and bottom plates, and is tight - like a drum skin. This gives the mesh structural integrity and strength. ‘LW’ filters are easily identifiable as the body is all mesh.
AR filters up to 600 mm diameter can be fitted with mesh down to 315 microns. The ‘AR’ type self-cleaning filters and strainers are very strong - the body being made up of a cage and a clamp - two layers of steel - and are suitable where conditions are challenging such as turbulent river or seawater locations.
The downside is that they handle less water for the size of screen, because the open area of the mesh is reduced by the cage and clamp.
LW filters can only be fitted with mesh of 1 mm or greater aperture. This is because the mesh needs to be robust enough to tension. The ‘LW’ type self-cleaning filters and strainers are also strong - but are more suited to applications and settings where low intake velocities are required - for example for fish or eel screening at cooling water and raw water intakes.
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The on the plus side they handle more water than the ‘AR’ type filters for the same size of screen, because the open area of the mesh is maximised; the mesh is area is not reduced by a supporting cage or clamp.
RFLW self-cleaning basket strainers are ideal for screening and pumping raw water, cooling water, and seawater, particularly where there is a need to protect aquatic life. Their high volume, low-velocity intake easily complies with EPA and Environment Agency rules.
The strainers have a dry weight range from approx. 155kg - 275 kg depending on model and outlet flange size, lifting gear is required to move them. RFLWs can be suspended in lakes, lagoons or rivers, or floated from buoys, or raised and lowered on a guide-rail system. They can often be bolted directly on to the intake of vertical and immersible pumps.
For best performance, make sure that there is good clearance around the strainer mesh so that back-washed debris can disperse, and that the RFLW is above any silt or sludge that may accumulate.
We also manufacture stands and guide rails specifically designed for our products to help you to site and maintain them.
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