Velcon Filter SO-424V Fuel Filter SO-436V5 Alternative

Product introduction

SO Series separator filter cartridges are professional-grade industrial coalescing and separation elements, specifically designed for efficient liquid-liquid and solid-liquid separation in hydrocarbon-based fluids, with a primary focus on deep dehydration and purification of lubricating oil, hydraulic oil, turbine oil, transformer oil, diesel fuel and natural gas. Engineered as a complete product line with standardized dimensions and modular configurations, SO Series cartridges integrate pre-filtration, coalescence and fine separation functions to effectively remove solid particulates, free water, emulsified water, oil sludge and oxidation byproducts from fluids. These cartridges feature stable performance under medium-to-high pressure, variable flow and varying temperature conditions, and are fully compatible with mainstream dedicated filter housings, oil purifiers and circulating separation systems. By delivering high-purity treated fluids, they protect critical downstream equipment including compressors, turbines, hydraulic pumps, precision valves and transformers from abrasion, corrosion, emulsification and performance degradation, ensuring the safe, stable and efficient operation of industrial fluid systems while complying with international industrial filtration and fluid treatment standards.

Filtration accuracy

SO Series separator cartridges provide graded precision options to meet diverse application requirements, with consistent high separation and filtration efficiency across the series. For solid particle interception, standard ratings cover 10μm, 3μm and 1μm, with filtration efficiency reaching up to 99.9% for rated particle sizes, effectively capturing rust, metal shavings, pipeline scale, colloidal impurities and sludge. In terms of liquid coalescence and separation, the series demonstrates outstanding performance, with liquid removal precision ranging from 0.5μm down to 0.3μm and separation efficiency as high as 99.99%. High-precision models can reduce the residual water content in treated fluids to below 50 ppm, fully meeting the strict dryness and cleanliness requirements for long-distance natural gas transmission, gas turbine lubrication, precision manufacturing and petrochemical process systems. The filtration and separation accuracy remains stable under rated operating conditions, with no significant performance attenuation caused by fluctuations in flow rate, pressure, fluid viscosity or ambient temperature.

Filter media

The entire SO Series adopts high-performance composite filter media, with targeted formulations for different separation and purification demands. Standard coalescing models utilize hydrophilic modified borosilicate glass fiber media, manufactured through an adhesive-free hot-melt lamination process with a gradient pore structure, which enhances water droplet coalescence efficiency, improves dirt-holding capacity and maintains low pressure drop, while eliminating secondary pollution caused by adhesive dissolution. Pre-filter and general-purpose models employ high-strength gradient polyester non-woven fabric, featuring excellent rigidity, large dirt capacity and cost-effectiveness, suitable for preliminary impurity interception and primary water coalescence. High-temperature and corrosion-resistant variants use PTFE-coated glass fiber media or heat-resistant reinforced glass fiber, with enhanced chemical and thermal stability. All cartridges are reinforced with an internal galvanized or 304 stainless steel support tube and an external polypropylene protective mesh to prevent media deformation under fluid impact. End caps are made of high-density epoxy resin or corrosion-resistant metal, paired with high-quality nitrile rubber (NBR) or fluororubber (FKM) gaskets to ensure zero bypass and reliable sealing.

Replacement cycle

The replacement cycle of SO Series separator cartridges is determined by model specifications, fluid contamination level, water content and actual operating environment, with a typical service life ranging from 6 to 24 months under normal conditions. For standard models in moderately contaminated systems (impurity content ≤ 50 ppm, water content ≤ 500 ppm), the recommended replacement period is 12–18 months. In harsh working environments, such as upstream oil and gas field gathering stations, heavy-duty hydraulic systems, gearboxes and fluids with frequent water ingress, the cycle is shortened to 6–12 months to maintain optimal separation and purification performance. For clean fluid systems with low contamination, such as refined oil transmission pipelines, natural gas boosting stations, transformer oil and turbine oil circulating systems, the service life can be extended to 18–24 months with regular biweekly differential pressure monitoring and monthly fluid quality sampling tests. For newly commissioned fluid systems, the first replacement is suggested within 4–6 months to remove construction residues including welding slag and pipe scale. The definitive replacement trigger is a system differential pressure of 0.25–0.35 MPa across the cartridge, indicating media blockage and reduced separation efficiency.

Features

1. Complete series and modular design: SO Series offers a full range of precision, size and material variants, with high interchangeability and easy matching, suitable for diverse industrial fluid separation scenarios.

2. High-efficiency multi-function integration: Each cartridge integrates pre-filtration, coalescence and fine separation, realizing efficient solid removal and deep dehydration in a single component.

3. Advanced composite filter media: Gradient pore structure, adhesive-free manufacturing, large dirt-holding capacity and low initial pressure drop, ensuring stable long-term performance and no secondary pollution.

4. Robust structure and reliable sealing: Reinforced internal support tubes, durable end caps and high-performance gaskets provide excellent pressure resistance and anti-deformation performance, guaranteeing zero bypass.

5. Wide fluid and environmental adaptability: Compatible with various mineral oils, synthetic oils, hydrocarbon fuels and natural gas, adaptable to a wide temperature range and resistant to corrosion and aging.

6. Standardized design and easy maintenance: Universal dimensions and interfaces enable tool-free installation and replacement, reducing system downtime and labor costs.

7. Cost-effective operation: Long service life and low pressure loss reduce energy consumption and replacement frequency, extend fluid service life and protect critical equipment.

8. Compliance with international standards: Designed and manufactured in accordance with global industrial filtration and fluid treatment specifications, suitable for global industrial applications.

Application areas

SO Series separator filter cartridges are widely applied across industrial sectors that require high-reliability fluid dehydration and purification, with key application areas including:Oil and gas industry: Natural gas extraction, gathering stations, long-distance transmission pipelines, city gate stations and LNG facilities, for removing water, oil mist and solid particulates.Petrochemical and refining industry: Crude oil processing, refined fuel storage and transportation, lubricating oil and hydraulic oil circulating purification, ensuring fluid cleanliness and stability.Power generation industry: Turbine oil, transformer oil and fuel treatment for thermal power plants, gas turbine power plants and combined-cycle power stations, protecting rotating and electrical equipment.Mechanical manufacturing industry: Large hydraulic systems, gearboxes, compressor lubrication systems and precision processing air supplies, preventing equipment wear and blockage.Marine and offshore industry: Shipboard engine lubricating oil, hydraulic oil and diesel fuel systems, as well as offshore platform fluid treatment, adapting to corrosive marine environments.Metallurgical and mining industry: Heavy machinery hydraulic systems and industrial water treatment, operating reliably in high-dust, high-impurity harsh conditions.Environmental protection and waste recycling: Industrial wastewater oil-water separation, waste oil regeneration and fluid recycling systems, achieving efficient resource recovery.

Conclusions

SO Series separator filter cartridges are a professional, high-reliability solution for industrial fluid coalescence and separation, combining a complete product matrix, advanced media technology and robust structural design. By efficiently removing solid contaminants and liquid impurities from fluids, they significantly improve fluid quality, extend fluid service life and protect critical downstream equipment, reducing equipment failure rates, maintenance costs and system downtime. The series’ wide range of precision options, material formulations and environmental adaptability make it suitable for nearly all industrial separation scenarios, from routine pre-filtration to ultra-precise deep dehydration. As a core component for optimizing fluid system performance and enhancing production efficiency, SO Series cartridges deliver exceptional practical value and stable performance, establishing themselves as a preferred choice for industrial customers worldwide seeking dependable and cost-effective fluid separation solutions.

Related products

1. SO Series Pre-Filter Cartridges: Coarse filtration models with 20μm and 30μm ratings, used upstream of high-precision SO separation cartridges to intercept large particles and extend service life.

2. SO-HT High-Temperature Resistant Series: Upgraded with heat-resistant glass fiber media and FKM gaskets, designed for high-temperature fluid systems up to 180℃, such as hot turbine oil and thermal process fluids.

3. SO-CR Corrosion-Resistant Series: Equipped with 316L stainless steel support tubes and PTFE-coated media, suitable for highly corrosive fluids and harsh chemical environments.

4. SO-FL High-Flow Series: Enlarged filtration area and high-density pleating, providing 2–3 times the flow rate of standard models for large-scale pipeline and industrial plant systems.

5. Matching Filter Housings for SO Series: Integrated separation housings with differential pressure gauges, liquid collection chambers and automatic drain valves, fully compatible with SO Series cartridges.

6. SO-PO Polishing Filter Cartridges: Ultra-fine post-filtration models with 0.5μm and 0.1μm precision, used downstream for final fluid polishing in pharmaceuticals, electronics and other high-purity applications.

7. Portable Oil Purification Units: Mobile separation and purification equipment utilizing SO Series cartridges, for on-site fluid treatment, emergency maintenance and temporary purification tasks.

8. Synthetic Oil Special SO Series Cartridges: Media modified for compatibility with synthetic oils (PAO, ester-based), ensuring stable separation performance for synthetic lubricating and hydraulic fluids.

SO629PLBZ	I6446	FOS618PL05	FO644PLF1TB	FO614PLF2
SO629PLF3	I6446TB	FOS618PL1/2	FO644PLF25M	FO614PLF25
SO629VA	I64483	FOS618PLP8	FO644PLF25TB	FO614PLF25M
SO630C	I64483TB	FOS636PL05	FO644PLF2M	FO614PLF5
SO630PV	I64485	FOS636PL1/2	FO644PLF2TB	FO614PLF5M
SO633C	I64485TB	FOS636PLP8	FO644PLF5M	FO614PLF75
SO633VA	I64487	FOS718PL25	FO644PLF5TB	FO629A3
SO636PV	I64487TB	I4084	FO656PLF2TB	FO629PL55
SO636V	I644C5	I4124	FO656PLF5TB	FO629PLF1
SO636VA	I644C5TB	I4126	FO718PL01	FO629PLF1/2
SO6370VA	I6560	I4154	FO718PL02	FO629PLF10
SO640PV	I6560TB	I4156	FO718PL05	FO629PLF2
SO640V	I6562	I4184	FO718PL05B	FO629PLF25
SO643C	I6562TB	I4186	FO718PL1/2	FO629PLF2TB
SO643VA5	I6-564TB	I4204	FO718PL15	FO629PLF5
SO644PLBZ	I6-566	I4208C	FO718PL50	FO644A3
SO644PLF3	I6-566TB	I4246	FO718PLP3	FO644PLF1/2
SO644PV	I6-5681TB	I4248F	FO736PL05	FO644PLF1/2M
SO644V	I6-5683TB	I5156	FO736PL1/2	FO644PLF1/2TB
SO644VA5	I6-5685	I6112	FO736PL15	FO644PLF10M
SO656C	I-65685TB	I-6116	FOS512PL25	FO644PLF10TB
I-614 MM	I-622 MM	I-633 MMTB	I-644 MMTB	FO-419APL5
SO656V	I65687	I-61183	FOS614PL05	FO644PLF1M
FO-629PLF5	I-628 MM	I-628 MMTB	I6-4487TB	SO-644VA5