SO-436V5 & SO-436VA5 Separation Filter Cartridges

Product introduction

SO-436V5 and SO-436VA5 are a matched pair of high-performance coalescing separation filter cartridges, purpose-built for efficient liquid-liquid and solid-liquid separation in industrial fluid systems, with a primary focus on dewatering and purifying hydrocarbon-based oils including turbine oil, hydraulic oil, lubricating oil, transformer oil and diesel fuel. SO-436V5 functions as the pre-filter and primary coalescing stage, responsible for intercepting large solid contaminants and preliminarily coalescing dispersed free water droplets. SO-436VA5 serves as the fine coalescing and final separation stage, designed to aggregate micro-sized emulsified water droplets into large, gravity-separable droplets, achieving deep dehydration and fine purification. Together, they form a complete two-stage purification system that effectively removes solid particles, water, sludge and oxidation byproducts from fluids, preventing equipment emulsification, corrosion, abrasion and performance degradation. These cartridges feature standardized dimensions and interfaces, ensuring broad compatibility with dedicated oil purifiers, filter separators and circulating purification systems, and comply with industrial fluid treatment and filtration standards.

Filtration accuracy

SO-436V5, as the pre-filter component, delivers a solid filtration rating of 10μm with 99.5% removal efficiency, reliably capturing large particulate impurities, metal shavings, rust and colloidal deposits to reduce the contamination load on the downstream fine cartridge and extend its service life. For liquid separation, it performs preliminary coalescence of free water droplets. SO-436VA5, the high-precision coalescing cartridge, achieves a solid filtration efficiency of 99.9% at 3μm and exceptional liquid separation performance: it can coalesce and remove water droplets as small as 0.3μm with an efficiency of 99.99%, reducing the residual water content in treated oil to below 50 ppm, meeting the stringent dryness and cleanliness requirements for critical industrial oil systems. The separation and filtration accuracy remains stable under rated flow, pressure and temperature conditions, with no performance attenuation caused by variations in oil viscosity or flow velocity.

Filter media

SO-436V5 utilizes high-strength gradient-pore polyester non-woven fabric as its core filtration media, characterized by excellent rigidity, large dirt-holding capacity and low initial pressure drop, making it ideal for pre-filtration and primary water coalescence. The media is reinforced by a perforated metal inner support tube to resist deformation under fluid flow. SO-436VA5 employs hydrophilic-modified borosilicate glass fiber media, manufactured via an adhesive-free hot-melt lamination process, with a gradient pore structure that maximizes water coalescence efficiency while maintaining fine solid interception. The specially treated glass fiber exhibits selective oleophilic and hydrophilic properties, promoting rapid water droplet aggregation without absorbing base oil. Both cartridges are equipped with corrosion-resistant metal end caps and high-quality nitrile rubber (NBR) sealing gaskets, ensuring zero bypass, reliable sealing and no secondary contamination of the processed fluid.

Replacement cycle

Under normal operating conditions, with moderate fluid contamination and water content not exceeding 500 ppm, the recommended replacement cycle for SO-436V5 is 6–12 months, while SO-436VA5 has a service life of 8–16 months. In harsh operating environments, such as heavy-duty hydraulic systems, gearboxes, or oil systems with frequent water ingress and high solid content, the replacement interval should be shortened to 4–8 months for SO-436V5 and 6–12 months for SO-436VA5 to maintain optimal separation and purification performance. For clean, low-contamination applications such as transformer oil and turbine oil circulating systems, the service life can be appropriately extended with regular differential pressure monitoring and oil quality testing. The optimal replacement timing is determined by system differential pressure: when the pressure drop across the two-stage assembly reaches 0.25–0.3 MPa, the cartridges must be replaced promptly to avoid reduced flow rate, insufficient dehydration and increased energy consumption. For newly commissioned fluid systems, the first replacement is recommended within 3–6 months to remove installation residues such as welding slag and pipe scale.

Features

1. Two-stage high-efficiency separation: The pre-filter and fine coalescing cartridge work in tandem to achieve efficient solid removal and deep dehydration, suitable for both high-water-cut and highly contaminated industrial oil systems.

2. Premium selective filter media: The combination of gradient polyester and modified borosilicate glass fiber media delivers high coalescence efficiency, large dirt-holding capacity and low pressure loss, ensuring stable long-term operation.

3. Robust structure and reliable sealing: Metal inner support tubes and precision-molded end caps provide excellent pressure resistance; high-grade NBR gaskets eliminate fluid bypass and leakage, guaranteeing consistent purification performance.

4. Matched standardized design: Universal dimensions and interfaces enable direct replacement in mainstream filter housings and oil purifiers, with simple installation and maintenance, reducing system downtime.

5. Wide fluid compatibility: Suitable for various mineral oils, synthetic lubricants, hydraulic oils, transformer oils, turbine oils and diesel fuels, with stable performance across a broad range of temperatures and viscosities.

6. Cost-effective operation: Effectively extends oil service life, reduces oil replacement frequency, protects critical precision equipment, lowers failure rates and cuts comprehensive operational costs.

7. Stable performance under variable conditions: Maintains high separation efficiency even under fluctuating flow rates, pressures and fluid temperatures, adapting to diverse industrial operating scenarios.

8. 

Application areas

SO-436V5 and SO-436VA5 are widely applied across industrial sectors that demand high-quality oil dehydration and purification, with key application areas including:Power generation industry: Purification of turbine oil, transformer oil and generator lubricating oil, preserving insulation performance and ensuring stable operation of power equipment.Petrochemical and refining industry: Circulating purification of lubricating oil, hydraulic oil and process oils in refineries and chemical plants, preventing corrosion and blockage of process equipment.Mechanical manufacturing industry: Treatment of hydraulic oil and gear oil in large machining equipment, compressors and injection molding machines, protecting precision components.Mining and metallurgy industry: Purification of hydraulic oil for heavy machinery and conveyor systems, adapting to harsh, high-dust operating environments.Marine and offshore industry: Dewatering and purification of marine engine lubricating oil, hydraulic oil and diesel fuel, suitable for corrosive marine conditions.Metal processing industry: Treatment of cutting fluids and lubricating oils, improving processing quality and extending fluid service life.They are also ideal for waste oil regeneration systems, oil recycling facilities and mobile oil purification units requiring efficient water and impurity removal.

Conclusions

SO-436V5 and SO-436VA5 constitute a professional, high-reliability two-stage coalescing separation filter cartridge set, engineered specifically for the deep dehydration and purification of industrial hydrocarbon fluids. Through the synergistic effect of pre-filtration and fine coalescence, paired with high-performance selective media, they efficiently eliminate solid particles and water from oils, significantly enhancing fluid quality and stability. Their robust construction, reliable sealing and wide compatibility make them suitable for long-term operation in diverse industrial oil systems. By protecting critical downstream equipment, extending oil service life and reducing maintenance and replacement costs, they provide a dependable safeguard for the safe, efficient and stable operation of fluid systems. With outstanding separation performance and cost-effectiveness, this cartridge set represents an optimal solution for industrial fluid purification, possessing high practical value and broad market prospects in the global industrial filtration sector.

Related products

1. SO-436V5-HT & SO-436VA5-HT High-temperature resistant variants: Upgraded with heat-resistant media and fluororubber (FKM) gaskets, designed for high-temperature oil systems up to 130℃, such as thermal power turbine oil systems.

2. SO-436V5-CR & SO-436VA5-CR Corrosion-resistant versions: Equipped with 316L stainless steel support tubes and end caps, suitable for oils containing corrosive additives or operation in highly corrosive environments.

3. SO-436PF Pre-filter cartridge: A 20μm coarse pre-filter designed to be installed upstream of SO-436V5, further extending the service life of the two-stage separation set in heavily contaminated fluids.

4. SO-436PO Polishing filter cartridge: A 1μm precision post-filter used downstream of SO-436VA5 for ultra-fine purification, producing ultra-clean oil for precision equipment and sensitive applications.

5. Dedicated two-stage filter housing for SO series: Integrated separation housing with differential pressure gauge, oil-water separation chamber and drain valve, perfectly matched with SO-436V5 and SO-436VA5.

6. SO series synthetic oil special coalescing cartridges: Media modified for compatibility with synthetic oils (PAO, ester-based), ensuring stable separation performance for synthetic lubricating and hydraulic fluids.

7. Portable oil purification unit using SO-436V5/VA5: Complete mobile purification equipment integrating the cartridge set, used for on-site oil treatment and emergency maintenance of various industrial oil systems.