Types of Industrial Oil Purifiers and How to Choose the Right One

Industrial Oil Purification Equipment: Main Types and Selection Tips

Selecting the right industrial oil purification machine helps cut costs, protect equipment, and reduce environmental impact. Below is a summary of the main purification technologies and their ideal applications.

1. Vacuum Oil Filter

Principle: In a vacuum, the oil’s boiling point drops. Heating and negative pressure remove dissolved water, gas, and impurities.

Applications: Used for transformer oil, turbine oil, and other oils with high water content.

Advantages: Excellent dehydration and degassing

Maintains oil quality

2. Centrifugal Oil Filter

Principle: Uses centrifugal force to separate oil, water, and solids by density.

Applications: Effective for oils with large water or impurity loads.

Advantages: High throughput, low maintenance

No filter replacement needed

Limitations: Cannot remove dissolved water or fine particles.

3. Plate and Frame Pressure Oil Filter

Principle: Oil is forced through filter plates and paper, trapping solids and some moisture.

Applications: For machining, steel rolling, and other high-impurity operations.

Advantages: Simple, affordable, easy to maintain

Limitations: Frequent paper replacement

Limited dehydration ability

4. Precision Oil Filter Cart

Principle: Portable system combining pump and multi-stage filters for high-precision filtration.

Applications: Online or offline maintenance of lubricating and hydraulic oils.

Advantages: Mobile and flexible

High filtration precision (NAS 5 or higher)

5. Coalescing and Separation Oil Filter

Principle: Two-stage system: coalescing elements merge tiny water droplets, separation elements remove them by gravity difference.

Applications: For demulsifying and purifying emulsified or milky oils.

Advantages: Excellent for emulsified oils

High water removal efficiency

6. Electrostatic Oil Purifier

Principle: Uses a high-voltage electrostatic field to attract and remove polar impurities, oxides, and submicron particles.

Applications: For fine purification and oil life extension in precision systems.

Advantages: Removes ultra-fine contaminants

Extends oil service life

Limitations: Poor for high water or metal content

Usually used as a final deep purification step

Summary

Each type serves a specific role:

Vacuum purifier – dehydration and degassing

Centrifugal purifier – heavy contamination

Plate and purifier – solid impurity removal

Precision cart – routine maintenance

Coalescing purifier – emulsified oil treatment

Electrostatic purifier – deep, fine cleaning

Choosing the proper system ensures longer oil life, stable operation, and lower maintenance costs across industrial applications.