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Time：2025-12-11 13:22:39 Reading volume：
Hydraulic oil centrifuges play a crucial role in industrial fluid purification. They are designed to remove water, solid particles (including micron-sized debris), and colloidal impurities caused by wear, contamination, and oil oxidation. The following guide provides a clear, comprehensive overview of hydraulic oil centrifuges, including types, advantages, and how to ｓｅｌｅｃｔ the right model for industrial applications.
Hydraulic oil centrifuges are generally divided into two main categories, each with distinct working principles and strengths.
Working Principle
This type uses the density difference between oil, water, and solid impurities. High-speed rotation creates a strong centrifugal force, pushing heavier solids and water to the outer wall of the rotor. Clean oil remains in the centre and flows out.
Key Features
No filter elements required → Lower long-term maintenance costs; only rotor sludge cleaning is needed.
Excellent water removal capability → Effective for both free water and emulsified water.
Strong performance for large particles & sludge → Handles metal wear debris, varnish, and colloids effectively.
Limitations with ultra-light particles → Less effective for particles with a density similar to oil (e.g., carbon particles).
Working Principle
A replaceable paper or metal filter screen lines the rotating drum. Contaminated oil enters the drum, and centrifugal force pushes impurities into the filter lining, providing deep filtration and high cleanliness.
Key Features
High filtration precision → Achieves NAS 5–7 or similar cleanliness classes.
Consumables required → Filter drum or screen must be replaced periodically.
Moderate water removal → Best for fine particle removal rather than dehydration.
Leading Brands and Market Applications
International Brands
Alfa Laval – Global leader in settling centrifuges, widely used in marine, industrial, and power sectors.
GEA – Known for advanced separation technology and industrial reliability.
SPINNER – Specialises in oil purification and centrifugal separation systems.
Pall, Parker – Offers complete fluid filtration systems, including centrifugal filters.
China / Asia-Pacific
SINO-NSH – Manufacturer of centrifuges and professional industrial oil purification equipment, serving metallurgy, power plants, marine, and heavy machinery sectors.
Ideal for systems where moisture causes emulsification, oxidation, and hydraulic performance decline.
Removes sludge, varnish, and micron-level metal wear particles that conventional filters cannot capture.
Reduces wear, equipment downtime, and the frequency of oil replacement.
Extends oil life and reduces waste oil generation.
Can run as a bypass purification system without shutting down the main equipment.
Water contamination is dominant → Choose a settling centrifuge.
Very fine particle contamination (servo valves, precision hydraulics) → Choose a centrifugal filter or a centrifuge + fine filter combination.
Mixed contamination (water + particles + sludge) → Settling centrifuge generally offers the best overall performance.
Match the centrifuge flow rate with tank volume and contamination level to ensure full oil turnover in a reasonable cycle time.
Mobile cart type → Multi-machine maintenance, emergency support.
Fixed bypass system → Long-term protection of critical equipment.
Inline system → Installed directly in the hydraulic circuit.
High-end systems may include:
Automatic sludge discharge
Online moisture detection
PLC control
Remote monitoring
Suitable for unattended or high-demand environments.
Steel & Metallurgy – Continuous casting machines, rolling mills, hydraulic presses.
Power Generation – Turbine control oil, transformer oil maintenance.
Marine & Offshore – Steering gear, deck hydraulics, engine lube systems.
Construction Machinery – Excavators, drilling rigs, tunnelling equipment.
Injection Moulding & Machine Tools – Precision hydraulic systems requiring high oil cleanliness.
