Disk filters belong to the category of mechanical filters designed to remove undissolved particles sized from 5 to 200 mcm from water.
Filtering element is represented by a set of special disks made of rigid polymer materials. The both surfaces of disks have diagonal grooves of certain depth and width providing for a high filtration degree.
A volumetric net structure being a working filtration element is formed between two neighboring disks at compression. Filtration surface in this case is the total area of all disks included into the set. Thickness of each disk is 0.8 – 1.5 mm (depending on the filtration rating); each set includes 1000 – 2000 disks.
Filter disk principle of operation is as follow: water is filtered as passing through intradisk spaces from outside-in. Therefore, large particles are precipitated on external cylindrical surface of disk filtering element, and smaller particles are trapped on the net structure between adjacent disks.
Disk filters are very efficient and have an excellent dirt-holding capacity.
Water mesh filter is used to remove mechanical admixtures from water. Filter body (normally cast) is made of heavy-duty steel or polymers. Filtering element of mechanical filters is represented by stainless steel mesh or perforated sheet. Mesh filters are installed in water preliminary treatment systems and prevent the system from entry of any foreign particles. These filters supply filtered water removing admixtures, namely rust and fine sand. Mesh filters are divided into filters with automatic and manual washing.
Mesh filter principle of operation is as follow: mechanical admixtures are trapped on mesh inserted into filter body and clamped with cover. Particles present in water flow contact with filtering element and collected in a special chamber on mesh. Some mesh filter models have magnetic inserts to separate metal particles and drainage taps for mechanical filter quick cleaning.
Dirty is accumulated on inner side of mesh and form a filtering pie. Automatic filter self-cleaning process is actuated upon achievement of set pressure drop or preset time. Mesh is cleaned by a vortex vacuum scanner that makes forward-rotary movements by electric drive and removes accumulated filtering pie from the mesh inner side through nozzles. Water consumption for filter cleaning is less than 1% of immediate flow.