Stainless Steel Bag Filter – High-Precision, Versatile Liquid Filtration

Product Overview

The stainless steel bag filter is a professional liquid filtration system engineered from high-quality stainless steel, 

available with mirror-polished, pressed, or sandblasted surface finishes. This advanced filtration solution represents 

a new generation of liquid processing equipment, utilizing a metal mesh basket that securely supports the filter bag within

 the housing. Liquid enters through the inlet, passes through the filter bag, and exits from the outlet, while impurities 

of varying particle sizes are effectively intercepted and retained within the bag. This efficient mechanism achieves the 

goals of liquid filtration, purification, separation, and recovery—all in a single, closed-system operation.

When the filter bag reaches its contaminant capacity, it can be quickly replaced, allowing the system to resume operation 

with minimal downtime. The stainless steel bag filter features a novel, compact structure with simple and flexible operation. 

Its energy-efficient design, high-performance capabilities, closed-system operation, and broad adaptability make it

 a versatile multi-purpose filtration solution for diverse industrial applications.

Advanced Construction and Surface Finishes

The stainless steel bag filter is fabricated from premium-grade stainless steel (typically 304 or 316L), selected for its

 exceptional corrosion resistance, durability, and hygiene properties. The surface finishing options provide both functional

 and aesthetic benefits:

· Mirror-Polished Finish: Delivers an ultra-smooth, reflective surface that minimizes particle adhesion, facilitates thorough

 cleaning, and meets the highest sanitary standards required in food, beverage, and pharmaceutical applications.

· Pressed Finish: Offers a textured surface that combines durability with cost-effectiveness, suitable for general industrial 

applications where appearance is less critical than structural integrity.

· Sandblasted Finish: Provides a uniform matte surface that reduces glare and masks minor scratches, ideal for heavy-duty

 industrial environments where equipment is subject to frequent handling and cleaning.

The high-grade material construction ensures long service life even when processing corrosive fluids, abrasive slurries,

 or high-temperature liquids, making the filter a dependable long-term investment.

Performance Characteristics

(1) Minimal Side Leakage Probability

The precision-engineered sealing design ensures that liquid passes exclusively through the filter bag, not around it. 

The bag basket's support structure and the sealing ring create a positive seal that minimizes bypass, effectively guaranteeing

 filtration quality and preventing unfiltered liquid from reaching the outlet.

(2) High Pressure Resistance with Low Pressure Loss

The robust stainless steel construction enables the filter to withstand significant working pressures without deformation or

 leakage. Simultaneously, the design minimizes pressure drop across the filter bag, reducing pumping energy requirements,

 lowering operating costs, and delivering measurable energy savings over the equipment's lifetime.

(3) Superior Filtration Accuracy

Advancements in filter bag media technology have continuously improved filtration precision, with select bag types achieving

 particle retention down to 0.5 μm. This exceptional clarity is suitable for applications requiring near-absolute filtration,

 including fine chemical processing, pharmaceutical formulations, and high-purity water treatment.

(4) High Capacity and Compact Design

Despite its small physical footprint, the bag filter offers substantial filtration area and contaminant-holding capacity. 

The bag's three-dimensional media structure provides depth filtration, capturing particles throughout the media thickness

 rather than only on the surface, significantly extending service intervals between bag changes.

(5) Quick and Convenient Bag Replacement

Based on a thoughtfully engineered system architecture, filter bag replacement is remarkably straightforward. The

 quick-opening cover design allows operators to access the bag chamber without tools, swap bags in minutes, and resume

 operations. The filter itself requires no cleaning—only the disposable bag is replaced—saving significant labor time and

 reducing operator exposure to process fluids.

(6) Reusable Filter Bags

Depending on the application and contaminant type, certain filter bag materials can be cleaned and reused multiple times. 

This recyclability substantially reduces consumable costs, improves operational economics, and aligns with sustainability 

initiatives by minimizing waste generation.

(7) Broad Application Range and Flexible Installation

The bag filter's versatility extends to compatibility with various liquid media, operating conditions, and installation 

configurations. Multiple connection options (flanged, threaded, sanitary clamp), mounting orientations (vertical, horizontal), 

and custom fittings ensure seamless integration into existing process systems.

Technical Specifications

Parameter Specification

Material Stainless Steel 304 / 316L

Surface Finish Mirror-polished / Pressed / Sandblasted

Filtration Accuracy Down to 0.5 μm

Operating Pressure Up to 1.6 MPa (model dependent)

Operating Temperature Up to 120°C (media dependent)

Connection Options Flanged, threaded, sanitary clamp

Application Fields

The stainless steel bag filter serves a wide spectrum of industries and processes:

· Chemical and Petrochemical: Filtration of acids, alkalis, solvents, polymers, and chemical intermediates

· Pharmaceutical: Sterile filtration, API purification, and buffer solution clarification

· Food and Beverage: Beer, wine, juice, edible oil, dairy products, and syrup filtration

· Water Treatment: Municipal and industrial water purification, reverse osmosis pre-treatment, and wastewater polishing

· Electronics: High-purity water and chemical filtration for semiconductor and display manufacturing

· Paint and Coatings: Paint, ink, resin, and coating material clarification

· Cosmetics: Lotions, creams, and essential oil purification

Frequently Asked Questions

Q1: What is the maximum operating pressure and temperature for the stainless steel bag filter?

The maximum operating pressure depends on the specific model and connection type, typically ranging from 0.6 MPa to 1.6

 MPa. Operating temperature is limited by the filter bag material and seal selection; standard configurations handle up to 120°C, 

with high-temperature options available up to 200°C. Please consult our technical team with your specific process parameters.

Q2: What filtration accuracy can be achieved with bag filters?

Filter bags are available in a wide range of micron ratings, from coarse (200 μm) to fine (0.5 μm). The selection depends on

 your specific particle size removal requirements. We offer polypropylene, polyester, nylon, PTFE, and other media types to 

match your fluid compatibility and accuracy needs.

Q3: How do I know when to replace the filter bag?

The primary indicator is the pressure differential across the filter. As the bag captures contaminants, differential pressure

 increases. When it reaches the recommended change-out value (typically 0.1–0.3 MPa above clean pressure drop), the bag 

should be replaced. Some installations use differential pressure gauges or transmitters for real-time monitoring.

Q4: Can the filter bag be cleaned and reused?

Certain bag types (e.g., nylon mesh, felt media) can be cleaned and reused, depending on the contaminant nature and

 cleaning method. However, absolute-rated depth media bags are typically disposable. For economic and environmental 

optimization, we recommend evaluating bag life and replacement frequency with our technical team.

Q5: Are the filters suitable for sanitary applications?

Yes, our stainless steel bag filters are available with mirror-polished internals, sanitary clamp connections, and FDA-compliant 

seal materials, making them suitable for food, beverage, pharmaceutical, and cosmetic applications. We can provide material

 certifications upon request.

Q6: What is the typical flow rate for a bag filter?

Flow capacity depends on the filter housing size, bag size (e.g., #1, #2, #3, #4), and fluid viscosity. Standard #2 size bag filters 

handle 20–40 m³/h for water-like fluids. Please provide your required flow rate and fluid properties for proper sizing.

Q7: How do I ensure proper sealing to prevent side leakage?

Proper installation is critical. Ensure the filter bag is correctly seated in the basket with the sealing ring properly positioned.

 Tighten the cover evenly to manufacturer-specified torque. Regular inspection of the sealing ring and cover gasket during bag 

changes will maintain leak-free operation.

Q8: Can the filter be used for both liquid and gas filtration?

While primarily designed for liquid filtration, bag filters can be adapted for gas applications where high particulate loading is

 expected. However, gas filtration typically requires specific considerations for pressure drop and bag support. Please consult 

our engineering team for gas applications.

Q9: What maintenance is required beyond filter bag replacement?

Regular maintenance includes: inspecting the metal basket for damage or deformation; checking cover seals and gaskets for 

wear; cleaning the housing interior during bag changes; and verifying pressure gauge accuracy. For critical applications, 

periodic inspection of internal welds and surface finish is recommended.

Q10: Can I switch between different bag materials in the same housing?

Yes, as long as the bag dimensions match the housing size (e.g., #1, #2), you can change media types to suit different processes.

 Ensure the selected bag material is chemically compatible with your fluid and operating temperature. Always verify that the 

bag's micron rating meets your process requirements.

For custom configurations, special materials, or application-specific engineering support, please contact our technical team. 

We offer complete bag filter systems, replacement filter bags, and ongoing technical support to ensure optimal filtration 

performance.

Product details