When choosing a filter, you need to pay attention to many factors, including filter performance, flushing self-cleaning function, material, water flow, brand and after-sales service. The following will be a specific analysis of the main considerations for filter selection:
1. Filter performance of a filter
(1) The accuracy of the filter screen: the accuracy of the filter screen directly determines the size of the particles it can intercept, if the accuracy of the filter screen reaches 40 microns, it can effectively intercept particles greater than or equal to 40 microns.
(2) Aperture uniformity: If the aperture of the filter screen is not uniform, it will cause some particles less than the average aperture to pass through the filter screen, thereby reducing the retention rate.
(3) Filter packaging technology: the packaging technology of the filter cartridge also has an important impact on the retention rate, and the filter cartridge using the integrated packaging sealing process or other advanced packaging technology can more effectively ensure the retention rate.
2. Rinse self-cleaning function of a filter
Automatic scraping technology: Some advanced pre-filter began to adopt automatic scraping design, through the power generated by the water flow for automatic scraping and other washing assistance operations, improve the cleaning effect and reduce the user's maintenance workload.
3. Material of pre-filter
(1) Filter material: 316 stainless steel has excellent corrosion resistance and oxidation resistance, which is the first choice for filters.
(2) Cup body material: In the northern region, due to the low temperature, the choice of anti-burst material cup can avoid rupture and water leakage caused by extreme conditions.
(3) Main material: lead-free copper can effectively avoid lead pollution in water and ensure pure water quality.
4. Water flow of a filter
Flow parameters: The pre-filter with a water flow of 6T/h can meet the daily water needs of most families and ensure the smooth flow of water.
5. Brand and after-sales of a filter
Big brands: try to choose professional big brands, such as the United States, Haier, etc., not only the quality guarantee is three years, the quality and price are relatively close to the people.
6. Inlet and outlet diameter
Matching pump inlet diameter: in principle, the inlet and outlet diameter of the filter should not be smaller than the inlet diameter of the matching pump, generally consistent with the inlet pipe diameter.
7. Nominal stress of a filter
Pressure level determination: Determine the pressure level of the filter according to the highest pressure that may occur in the filter line.
8. Number of aperture mesh
Impurity particle size consideration: mainly consider the impurity particle size to be intercepted, according to the medium process requirements.
9. Filter material
The same pipe material selection: for different service conditions can be considered to choose cast iron, carbon steel, low alloy steel or stainless steel filters.
10. Calculation of resistance loss
Pressure loss of water filter: under the rated flow rate of general calculation, the pressure loss is 0.52 ~ 1.2kpa.
11. Operating pressure
Maximum pressure operation: The operating pressure should be within the maximum pressure allowed by the filter pipe.
12. Wettability and adhesion of filter medium dust
Wetting Angle characterization: wettability and wettability of dust in sewage can be characterized by wetting Angle, usually less than 60° for hydrophilic medium, greater than 90° for hydrophobic medium.
13. Filter medium dust flow and friction
Abrasive material treatment: When the friction of the medium is strong, these substances will directly wear the filter bag and reduce the service life.