Stainless Steel Bag Filter

Our Stainless Steel Bag Filter is a heavy-duty, high-flow industrial liquid filtration system engineered for efficient removal of suspended solids, sediment, rust, sludge, particulate impurities and visible contaminants from various liquid streams. Built with food-grade or industrial-grade 304/316L stainless steel, this filter adopts a top-entry or side-entry bag housing design with standard polypropylene or polyester filter bags (customizable filter media available), serving as a cost-effective pre-filtration and fine filtration solution for high-flow and high-impurity industrial scenarios.

Unlike precision cartridge filters (security filters), stainless steel bag filters feature a larger dirt-holding capacity and higher flow rate per unit, making them ideal for bulk liquid processing and heavy-duty impurity removal. The fully polished stainless steel construction resists corrosion and avoids fluid contamination, with a user-friendly quick-release design for fast filter bag replacement. It acts as a reliable protective barrier for downstream pumps, valves, membranes, meters and production equipment, effectively preventing blockage, abrasion and premature equipment failure, and is widely recognized in global industrial filtration markets for its stable performance and low operating cost.

Technical Features

Full Stainless Steel Heavy-Duty Housing: Manufactured with seamless stamping, precision argon welding and integrated molding, available in 304 (standard) and 316L (corrosion-resistant upgrade) stainless steel, suitable for neutral, corrosive, acidic and alkaline liquid environments with long service life.

High Dirt-Holding & High-Flow Design: Optimized internal flow channel and large-capacity filter bag structure, delivering 3-5 times higher dirt holding capacity than standard cartridge filters, supporting single-bag, 2-bag, 3-bag and multi-bag modular configurations to match large flow demands.

Tool-Free Quick-Open System: Equipped with swing bolt, quick-release clamp or lifting eye quick-opening structure, no professional tools required for filter bag replacement, cutting downtime and on-site maintenance labor to a minimum.

Zero Leakage Sealing Technology: Uses press-fit sealing ring with elastic compression design, ensuring 100% no liquid bypass between filter bag and housing, avoiding unfiltered liquid leakage and guaranteeing consistent filtration efficiency.

Wide Filtration Accuracy Range: Filter bag precision ranges from 1μm to 200μm, covering coarse pre-filtration to medium fine filtration, fully adaptable to diverse industrial process filtration requirements.

Hygienic & Dead-Angle Free Polishing: Internal and external mirror polishing or matte polishing optional, no dead corners for fluid residue or bacterial growth, compliant with FDA, CE and 3A sanitary standards for food, beverage and pharmaceutical hygiene scenarios.

Flexible Installation & Connection: Supports vertical floor-mounted or wall-mounted installation, with threaded (NPT/BSPT) or flange connections, compatible with global standard pipeline layouts and easy to integrate into existing production lines.

Core Technical Parameters Table

Core Advantages

Our Stainless Steel Bag Filter stands out in the global industrial filtration market with unique performance and economic benefits, solving core pain points for overseas industrial users and outperforming ordinary plastic filters and small cartridge filters:

Ultra-High Dirt Holding Capacity & Lower Replacement Frequency: The large-volume filter bag design delivers exceptional impurity storage capacity, reducing filter media replacement times by 60% compared to standard cartridge filters, cutting down consumable costs and maintenance workload for long-term operation.

High Flow Efficiency & Space-Saving Design: Optimized fluid dynamics and multi-bag modular structure enable high flow output with a compact footprint, perfect for large-flow industrial liquid treatment such as chemical processing, water treatment and coating filtration, without occupying excessive workshop space.

Low Operating & Maintenance Cost: Filter bags are low-cost consumables with quick replacement (usually 5-10 minutes per change), no complex disassembly or professional maintenance required. The reusable stainless steel housing further reduces long-term investment, making it the most cost-effective choice for bulk filtration.

Strong Corrosion Resistance & Wide Compatibility: 304/316L stainless steel housing resists rust, acid, alkali, salt and chloride corrosion, compatible with most industrial liquids, including clean water, wastewater, chemical solvents, edible fluids and corrosive process liquids, adaptable to diverse working conditions.

Stable Filtration Performance & Equipment Protection: Strict bypass-free sealing ensures consistent filtration efficiency, effectively removing particulate impurities and protecting expensive downstream equipment (pumps, membranes, meters, nozzles) from abrasion and blockage, extending equipment service life and reducing production downtime.

Sanitary Compliance & Eco-Friendly: No chemical coatings, no metal precipitation and no secondary fluid contamination. Food-grade polished models meet international food, beverage and pharmaceutical hygiene standards, suitable for strict sanitary filtration scenarios.

Application Areas

This stainless steel bag filter is widely applied in global industrial and commercial liquid filtration scenarios, especially suitable for high-flow and high-impurity liquid treatment, covering major industries including but not limited to:

Industrial Water Treatment: Municipal/industrial tap water pretreatment, groundwater/surface water purification, cooling circulating water filtration, wastewater pretreatment, reclaimed water reuse, and reverse osmosis (RO) system front-end protection.

Chemical & Petrochemical Industry: Filtration of chemical solvents, resins, coatings, inks, lubricants, petroleum products, surfactants and acid-base solutions, removing particulate impurities to protect reaction kettles and conveying pipelines.

Food & Beverage Industry: Filtration of fruit juice, syrup, edible oil, wine, beer, dairy products, mineral water and food additives, meeting food safety standards and ensuring product clarity and quality.

Paint & Coating Industry: Automotive coatings, architectural coatings, industrial paint filtration, removing agglomerates and impurities to improve surface finish and avoid spray nozzle blockage.

Pharmaceutical & Cosmetics: Pharmaceutical raw material liquid, cosmetic lotion, skin care products and oral care liquid filtration, complying with GMP hygiene standards.

Other Heavy Industrial Fields: Mining wastewater, textile printing and dyeing wastewater, electroplating solution, pesticide fertilizer liquid, metalworking fluid and marine water treatment filtration.

Frequently Asked Questions (FAQ)

1. What is the difference between 304 and 316L stainless steel bag filter housings?

304 stainless steel is the standard economical option, suitable for clean water, neutral liquids and general industrial applications with good basic corrosion resistance. 316L stainless steel contains molybdenum, offering superior resistance to chloride, acid and alkali corrosion, ideal for seawater, corrosive chemicals, food contact and high-hygiene pharmaceutical scenarios.

2. How often should I replace the filter bag for optimal filtration effect?

Filter bag replacement cycle depends on liquid impurity concentration and daily operating hours. For low-impurity clean water or edible liquids, replace every 1-3 months; for high-impurity industrial wastewater, coatings or chemical liquids, replace every 2-4 weeks. You can also monitor the inlet-outlet pressure difference: replace the filter bag when the pressure difference exceeds 0.1 MPa to avoid reduced flow and overloading.

3. Can the filter bag be cleaned and reused, or is it single-use only?

Standard polypropylene (PP) and polyester (PE) filter bags are disposable for cost efficiency and hygiene, especially in food and pharmaceutical applications. For non-hygienic industrial scenarios with low impurity levels, reusable nylon or metal mesh filter bags are available as a customizable option, which can be backwashed and reused multiple times to further reduce consumable costs.

4. How do I choose the right filter bag accuracy and quantity for my application?

For coarse pre-filtration (removing large sediment and sludge), choose 50-200μm accuracy; for medium fine filtration (removing fine particles), choose 1-50μm accuracy. Filter bag quantity is determined by your required flow rate: 1 standard #2 bag supports 10-30m³/h, 2 bags support 20-60m³/h, and multi-bag configurations are available for flows over 60m³/h. Provide your flow rate and impurity type, and we will recommend the optimal configuration.

5. What is the lead time for standard and customized stainless steel bag filters?

Standard single-bag and 2-bag models (304 stainless steel, conventional connections) have a lead time of 7-15 working days. Customized models (316L material, multi-bag design, non-standard flanges, high-temperature/pressure configurations) have a lead time of 15-25 working days. We offer expedited production services for urgent project orders to meet tight delivery schedules.

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