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Time：2025-10-20 14:00:17 Reading volume：
The goal of lubricating oil filtration is to remove impurities, moisture, and oxidation products to restore oil performance and extend the life of both lubricant and equipment.
Depending on the application, oil type, and contamination level, several kinds of oil purification equipment are available.
A common, flexible choice for on-site maintenance and refueling.
Working Principle:
Oil is drawn from a tank, filtered through one or more filter elements, and returned to the system or used for refilling.
Core Components:
Filter element: Choose by function—particle removal, coalescing (for free water), or adsorption (for moisture and acids).
Pump: Manual, electric, or pneumatic options.
Advantages:
Portable and cost-effective.
Supports oil transfer, refueling, and filtration of circulation.
Applications:
Maintenance of engines, hydraulic systems, or small oil tanks.
A permanently installed system providing continuous filtration.
Working Principle:
Filters oil continuously in parallel or through an independent circulation loop.
Advantages:
Keeps oil clean at all times.
Automated features like pressure alarms and level control.
Extends filter and equipment life.
Applications:
Used in large hydraulic systems, turbines, transformers, and central lubrication units where oil cleanliness is critical.
Ideal for removing water and large solid particles due to density differences.
Working Principle:
High-speed rotation throws heavier water and impurities outward for separation.
Advantages:
Excellent water removal performance.
No filter elements or consumables.
Handles high contamination loads.
Disadvantages:
Less effective for particles under 1μm.
High initial cost and noise.
Applications:
Oils with high water or metal content, such as marine engine oil or rolling mill oil.
The most efficient for removing dissolved water and gases.
Working Principle:
By heating oil under vacuum, water vaporizes at a low temperature and is condensed out.
Advantages:
Removes dissolved water and air.
Enhances dielectric strength and oil quality.
Often includes precision particulate filters.
Disadvantages:
Expensive and complex.
Heat may affect aged or additive-rich oils.
Applications:
Used for transformer oil, turbine oil, and hydraulic oil requiring extremely low moisture and gas content.
Solid particles: Use an oil filter with high-precision filter elements (refer to ISO cleanliness levels).
Free water: Choose a coalescing filter or centrifugal separator.
Emulsified/dissolved water: Use a vacuum oil purifier.
Acids and sludge: ｓｅｌｅｃｔ filters with adsorption media such as activated alumina.
High-viscosity oils (e.g., gear oil) require stronger pumps and customized filter media. Ensure compatibility with oil additives to avoid chemical reactions.
Small-scale/periodic use: Portable oil filter cart.
Continuous or critical operation: In-line system or large vacuum unit.
High water content: Centrifugal separator or coalescing system.
Check for power availability, explosion-proof requirements, and mobility needs before choosing between electric, pneumatic, or manual types.
Summary and Best Practices
Routine maintenance: Use portable oil filter carts with replaceable elements.
High water content: Choose centrifugal or coalescing filters.
Ultra-dry applications: Use vacuum oil purifiers.
Critical equipment: Install in-line filtration for continuous protection.
Tip: Always perform an oil analysis before selecting equipment. Understanding contamination levels ensures the most cost-effective and efficient filtration solution.
