Precision filter, also known as the security filter, is generally set before the pressure vessel to remove fine particles with turbidity of more than 1 degree to meet the requirements of the following process on water; It is also sometimes placed at the end of the entire water treatment system to prevent fine particles (such as broken resin) from entering the finished water.
The security filter adopts the formed filter material. Under the action of pressure, the stock liquid passes through the filter material, the filter slag stays on the tube wall, and the filtrate flows out through the filter material, so as to achieve the purpose of filtration. Structure: filter cloth, filter screen, filter piece, sintered filter tube, wire wound filter element, meltjet filter element, etc. Because of the different filter material, filter aperture is not the same. Precision filtration is a kind of filtration between sand filtration (coarse filtration) and ultrafiltration, and the filter aperture is generally in the range of 0.5~120μm. The same form of filter material, according to the size of the appearance can be divided into different specifications. Wire-wound filter element (also known as honeycomb filter element) has two kinds: one is polypropylene fiber - polypropylene skeleton filter element, the highest use temperature of 60℃; The other is absorbent cotton fiber - stainless steel skeleton filter element, the highest use temperature 120℃. Melt-blown filter element is made of polypropylene as raw material, which is formed by melt-blown process. The maximum working temperature is 60℃. Precision filtration can remove suspended solids, some colloidal substances and small particulate matter in water.
