The main filter product names of China Strainer Network include:Stainless Steel Y Type Strainer,Steel Shell Strainer,T Type Flange Strainer,U-shape Strainer,ZQX Type Automatic Clean Strainer.

1. The Fundamentals of Liquid Filtration Testing 

The precision of liquid filtration is not a static number. It is determined by three specific variables:The Test Medium: The specific type of fluid being processed.Contaminant Characteristics: The shape and nature of the particles (e.g., standard Arizona Test Dust vs. spherical glass beads).Flow Dynamics: The testing method used, such as Single-pass or Multi-pass flow.

2. Why Filter Media Rating Doesn't Guarantee Assembly Precision 

A common technical misconception is that the precision of the raw media equals the precision of the finished filter. This is incorrect for two primary reasons:Housing Dynamics: A complete filter assembly includes a housing. The internal geometry of the housing creates flow patterns, turbulence, and dispersion effects that raw media cannot simulate.Effective Area and Geometry: Once media is pleated or shaped into an element, the change in surface area and geometry alters the way fluid interacts with the pores.

3. The Dynamic Variables: Velocity and Pressure Drop  

Filtration precision is a dynamic value that changes throughout the service life of the element:Effective Area Reduction: As particles clog the pores, the "open" surface area decreases.Increased Flow Velocity: Under constant flow conditions, a smaller effective area forces the local flow velocity to increase. This "jetting" effect can push contaminants through the media that would otherwise be captured.Differential Pressure: An increase in  is a direct indicator that the effective filtration area is shrinking, which inherently shifts the filtration precision and the filtration ratio (Beta Ratio).

4. The Cleanliness Paradox: When Lower Precision is Better 

High-precision filters are necessary for high cleanliness, but they are not the only factor. A higher precision rating does not always guarantee a cleaner output.

The Velocity Factor: In some industrial applications, if a fluid fails to meet cleanliness standards, replacing a high-precision element with a lower-rated one (e.g., moving from 5μm to 10μm) can actually improve the result.
The Reason: The lower-rated media may offer lower resistance, thereby reducing the local flow velocity through the pores and allowing for more effective particle entrapment.

Conclusion： 

Engineers must not rely solely on the nominal rating of the filter media to predict system performance. Optimal filtration is achieved by balancing media precision, fluid viscosity, and flow velocity. Choosing the right filter requires a deep understanding of how these variables interact under actual working pressure.

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