The filtering principle of stainless steel filters is based on physical interception and surface adsorption mechanisms. Graded interception of impurities of different particle sizes is achieved through a multi-layer filter structure or the use of specific filter materials.
Filtration Principle
Physical Interception
Stainless steel filters mechanically intercept impurities through filter apertures. When fluid passes through the filter, impurities with a particle size larger than the aperture are intercepted, while those with a particle size smaller than the aperture pass through with the fluid. The filter aperture accuracy directly influences the filtering effect. Common accuracy ranges are 50-1000μm, with some high-precision filters achieving 25μm.
Surface Adsorption
Some filter surfaces are specially treated (e.g., via electrochemical polishing or coating) to enhance electrostatic adsorption or van der Waals force adsorption of tiny particles, further improving filtering efficiency.
Key Technologies for Efficient Filtration of Impurities of Different Particle Sizes
Multi-Stage Filtration Structure
A multi-layer filter combination, such as a coarse filter + fine filter or filter elements with different apertures in series, is employed to achieve graded filtration. The coarse filter intercepts large particles (e.g., suspended matter and fibers), while the fine filter handles tiny particles (e.g., colloids and microorganisms), preventing single-filter blockage and efficiency degradation.
Filter Accuracy and Aperture Design
Coarse Filter: Larger aperture (e.g., 500-1000μm) for intercepting large particles.
Fine Filter: Smaller aperture (e.g., 25-50μm) for filtering tiny particles.
Filter Element Material: 304 or 316L stainless steel wedge filters offer high strength and corrosion resistance, with filtration accuracy up to 25μm.
Backwash Regeneration Technology
When impurities accumulate on the filter surface and increase pressure differential, the system automatically initiates backwashing:
High-Pressure Backwashing: Water flow is reversed to dislodge attached impurities.
Pneumatic Drain Valve: Rapidly drains water, reducing backwash water consumption (e.g., a single cycle takes 23 seconds).
Internal Injection Design: Special filter structures create a jet effect to ensure complete impurity removal.
Material Corrosion Resistance
304 and 316L stainless steel filters withstand harsh conditions (e.g., high temperatures, pressures, and corrosive fluids), extending filter lifespan and reducing replacement frequency.
Application Scenarios and Effects
Industrial Field: Filters impurities in oil, natural gas, and chemicals to ensure process stability.
Food and Beverage: Filters liquid foods (e.g., milk, juice) to enhance product quality.
Medical and Pharmaceutical: Removes tiny bacteria and viruses to ensure equipment and medicine cleanliness.
Sewage Treatment: Eliminates suspended particles and organic matter to improve water quality.
Technical Parameters and Performance
Working Pressure: 0.3-2.0MPa (adaptable to diverse conditions).
System Pressure Loss: 5-20KPa (reduces energy consumption).
Working Temperature: 0-250℃ (suits high-temperature environments).
Backwash Time: ~23 seconds per cycle (supports continuous, automated production).
Advantage Summary
Stable Filtration Effect: Multi-layer filters and backwashing technology ensure long-term efficiency stability.
Deep Filtration Ability: Outstanding dirt interception capacity for varied particle sizes.
Easy Operation: Few wearing parts and low maintenance costs.
Intelligent Control: Pressure differential, time, or manual cleaning modes adapt to fluctuating water quality.
