HFS - Hydrostatic Filtration System - Deep Bed
Our compact deep bed gravity filters are usually deployed for the removal of solid particles as well as for oils and chemicals.
The HFS series can be applied in many different industries for the filtration of lubro-coolants (emulsions and oils) and water.
The filtration occurs through gravity and the used filtration media is a woven or non-woven cloth. The level of filtration depends on the type of filter cloth used. For the filtration of oils and chemicals out of water, we have a special line of non-woven filter cloth at our disposal.
When our HFS deep bed filter is compared to a standard flat bed gravity filter the advantages are clear. The size of a HFS deep bed filter is much smaller, but the capacity is the same, the filtration degree is higher and the consumption of filter cloth is lower.
The filter cloth is chosen on these specific factors: The dirt-load, the flow, the type of liquid which has to be filtered and the material that has to be filtered out of the liquid.
All our gravity filters can be equipped with a magnetic separator. This is necessary for a system when the dirt-load consists of mostly ferrous particles. By using a magnetic separator, the consumption of filter cloth will be much lower.
The filters consist of a supporting structure (1) and liquid diffuser (2) made of coated - or stainless steel.
The filter cloth is supported and moved forward by a metallic conveyor belt (3). This conveyor belt is supported by a motor- and a counter-shaft (4) and is connected by two rings to two metallic meshes (5) in order to support and tension the conveyor belt.
The conveyor belt and the filter cloth are driven by a motor (6), which is controlled by a level sensor (7). When the level in the tank rises to high, because of dirt-cake formation on the filter cloth, the level sensor will trigger the motor to supply a new section of cloth.
The motor creates the ideal speed for moving the used cloth into collection bin (8).
It is also possible to order a scraper and a roller. The roller will roll up the used cloth after the scraper separated the dirt from the cloth.
The HFS filters operate fully automatic.
The liquid that has to be filtered arrives from the process through a recirculation pump and is led by the liquid diffuser onto the filter cloth.
The dirt that has to be filtered out of the liquid stays on the surface of the filter cloth or is absorbed in case of oils and chemicals.
Because of the forming of a ‘cake’ (layer of dirt), the filtration degree rises, but the permeability drops. The liquid level in the tank will rise and the sensor will trigger the motor to supply a new piece of filter cloth. Then the level in the tank will drop again and the level sensor will stop the motor from supplying cloth. The used cloth will fall into the collection bin.
The filtered water goes into the clean liquid tank underneath the filter and flows from there back into the process by means of a pump or gravity.
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