If you open a bag filter housing, you may notice a stainless steel spring installed inside the filter bag. Although it is a small component, the spring plays an important role in maintaining filtration performance.
1. Supporting the Filter Bag
During operation, liquid flow and differential pressure may cause the filter bag to deform or collapse. The support spring keeps the filter bag fully expanded and maintains its shape.
This ensures that the entire filtration area remains available and prevents the bag from shrinking inward.
2. Improving Filtration Efficiency and Bag Life
A properly supported filter bag can distribute contaminants more evenly across the filter media.
Without adequate support, particles may accumulate in a limited area, causing premature clogging and reducing the service life of the filter bag.
By keeping the bag open, the spring helps improve dirt-holding capacity and extends replacement intervals.
3. Assisting Filter Bag Installation
The spring also helps position the filter bag correctly inside the housing. It makes installation easier and contributes to stable operation by keeping the bag securely in place.
Material Options
Support springs are commonly manufactured from SS304 or SS316 stainless steel, depending on the application requirements and corrosion resistance needs.
Conclusion
Although the support spring is only a small component inside a bag filter housing, it contributes significantly to bag stability, filtration performance, and service life.
Choosing a properly designed filter housing means paying attention not only to the vessel itself, but also to every component inside.