The security filter is generally set before the pressure vessel to remove fine particles with a turbidity of more than 1 degree to meet the requirements of the subsequent process for water intake; sometimes it is also set at the end of the entire water treatment system to prevent fine particles (such as broken resin) into the finished water.
Most of the security filters (also called precision filtration devices) are made of stainless steel with a filter element (such as PP cotton) inside, which are mainly used after multi-media pretreatment filtration and before reverse osmosis, ultrafiltration and other membrane filtration equipment. It is used to filter out fine substances (such as tiny quartz sand, activated carbon particles, etc.) after multi-media filtration to ensure the accuracy of water filtration and to protect the membrane filter elements from being damaged by large particles. The precision grade of the filter element installed in the precision filtration device can be divided into 0.5us, 1us, 5us, 10us, etc. According to different occasions, different filtration precisions are selected to ensure the accuracy of the rear effluent and the safety of the membrane elements of the latter stage.
Security filters have the following features:
. Can effectively remove suspended solids, rust, etc. in the liquid.
. Can withstand higher filtration pressure.
.The unique deep mesh structure enables the filter element to have a higher slag-holding load capacity.
. The filter element can be made of various materials to meet the needs of various fluid filtration.
.Small volume, large filter area, small resistance and long service life
Security filter technical parameters
Design pressure: 0.75—1.6Mpa
Design temperature: 20℃~120℃
Sealing type: O-ring and flat gasket
Sealing material: dingqin rubber, silicone, fluorine rubber, standard configuration is silicone seal
Interface form: tooth mouth, clamp, GB, HG, DIN, ANSI, JIS standard flange
Applicable filter elements: flat and 222 and 226 socket filter elements
Surface treatment: matte bead blasting, mirror polishing, electrolytic polishing
Filtration precision: 1μm--100μm-
Material: SUS304 316L
Security filter application
1. Nanofiltration (NF), ultrafiltration (UF), reverse osmosis (RO), electrodialysis (EDI) and other system security filtration and terminal filtration;
2. Filtration of pharmaceutical injections, large infusions, eye drops, Chinese herbal medicines, etc., extraction, purification and concentration of biological preparations;
3. Pre-filtration and terminal filtration of high-purity water for electronics, microelectronics, and semiconductor industries;
4. Filtration of oilfield re-injection water, boiler feed water, chemical reagents, liquid organic products, high-purity chemicals, concentrated drugs, etc.;
5. Filtering of drinking pure water, mineral water, fruit juice, tea drinks and health drinks;
6. Filtration of liquor, wine, beer, rice wine and other fruit wines, sterilization and filtration of pure draft beer (instead of pasteurization);
7. Pretreatment filtration or security filtration in the process of production, domestic wastewater treatment and reclaimed water recycling;
8. Others such as biological engineering, oil refining, printing and dyeing, water supply and wastewater treatment in the textile industry, scientific research and experimental filtration, etc.
