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Pure round wedge wire filter cartridges are all-metal filtration elements constructed with V-shaped profile wires spirally wound around internal support rods. The "pure round" designation refers to the tight concentricity tolerance maintained during manufacturing, with outer diameter variation held within ±0.2mm across the entire cartridge length. This precision fit prevents bypass between the cartridge and filter housing seal.
Manufacturing uses induction welding technology to bond each wire intersection, creating a continuous slot structure without weld bead protrusion. The smooth, uniform surface prevents fiber accumulation and facilitates complete cake discharge during backwash cycles. Unlike woven mesh or sintered fiber elements, these cartridges contain no internal media that can migrate or unload during pressure surges.
The V-wire profile creates slots that narrow toward the upstream surface, ensuring that all particles smaller than the slot opening pass completely through the element. This design provides consistent filtration rating across the entire cartridge surface, with no pore size variation as seen in random fiber media.
All-metal construction allows operation at elevated temperatures up to 480°C depending on material grade, with no thermal degradation of filtration performance. Cartridges withstand repeated backwashing and chemical cleaning, providing service life 5-10 times longer than disposable filter elements in continuous industrial applications.
Specification | Details |
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Standard Diameters | 20mm, 25mm, 32mm, 34mm, 36mm, 42mm, 45mm, 60mm, 75mm, 80mm, 95mm, 100mm, 114mm, 120mm |
Slot Size Range | 0.03mm - 30mm |
Filtration Precision Range | 0.05mm - 15mm |
Maximum Cartridge Length | 6 meters |
Available Flow Directions | Outside-to-inside, inside-to-outside |
Standard End Connections | Welded rings, threaded couplings, flanges |
Welding Technique | Continuous induction welding |
Maximum Operating Temperature | 480°C (material dependent) |
Maximum Differential Pressure | 1.0MPa |
These cartridges are dimensionally compatible with most industrial filter housings from major manufacturers. Standard diameters directly replace common size 1, size 2, and size 3 filter elements without housing modification. Common installations include:
Automatic self-cleaning filter systems
Candle filter systems for chemical processing
Edible oil and biodiesel filtration
Resin trap applications in water treatment
Catalyst recovery in petrochemical processing
Pharmaceutical and beverage filtration
Cooling water side-stream filtration
Hydraulic oil filtration in heavy machinery
End connections may be specified with 222, 226, or custom adapter fittings to match existing hardware. EPDM, Viton, or PTFE gaskets are available for chemical compatibility.
Backwash cycles typically require 10-15 seconds with flow velocity of 1.5-2.0m/s through the filter surface to remove accumulated solids. Chemical cleaning with 2-5% caustic or acid solutions removes organic or mineral scale deposits without damaging the wedge wire structure.
Under continuous operation with appropriate pre-filtration and regular cleaning, service life ranges from 2-5 years in most water applications, and 1-3 years in chemical process service. Cartridges show no degradation in filtration efficiency over time, as slot dimensions remain unchanged throughout the product lifespan.
Filtration rating is selected based on the smallest particle requiring removal. For critical applications, on-site pilot testing with multiple slot sizes is recommended to determine optimal balance between filtration efficiency and service interval.
Dimensionally equivalent cartridges directly replace most disposable and permanent metal elements, provided the end connection configuration matches. Flow rates may differ due to open area variations.
Standard EPDM gaskets suit water and mild chemical service. Viton is recommended for hydrocarbon and high-temperature service, while PTFE provides compatibility with strong acids and solvents.
Standard diameters and lengths are available in quantities as low as 1 unit. Fully custom dimensions require a minimum order of 10 units, with 21-day production lead time.