Varnish Removal Unit
A varnish removal unit is essential when oil degradation leads to valve sticking, turbine trips, filter blockage, and premature oil aging.
The CJC® Varnish Removal Unit (VRU) removes dissolved and suspended soft contaminants from oil systems -even during hot operation, restoring system reliability and extending oil and component life.
Why a Varnish Removal Unit Is Needed
Varnish is formed by oil degradation products generated in high-temperature zones such as bearings, pumps, and inline filters. These soft contaminants exist in both dissolved and suspended phases, making them impossible to remove with conventional mechanical or electrostatic filtration.
If not removed, varnish causes:
- Valve sticking and turbine trips
- Restricted oil flow and rising oil temperatures
- Increased wear on bearings and hydraulic components
- Frequent oil changes and system flushing
A dedicated varnish removal unit targets these soft contaminants before they deposit on critical surfaces .
How CJC® Varnish Removal Technology Works
The CJC® VRU uses polar attraction in optimized, cellulose-based VRi varnish removal inserts to remove oil degradation products safely and continuously.
The process:
Hot oil is drawn from the system tank into the VRU
Dissolved and suspended varnish precursors are captured in the VRi inserts
Oil is returned clean - without chemicals, beads, or additive depletion
Clean oil gradually dissolves existing varnish deposits in the system
In documented cases, varnish levels are typically reduced by 50% within weeks of operation
CJC® Varnish Removal Unit Models
The CJC® VRU range supports oil volumes up to 45,000 liters (11,900 gal) and is suitable for continuous offline operation on live systems.
Typical applications include: Gas and steam turbines,Turbine lube and control oil systems, Hydraulic oil systems & Compressor oil systems
Proven Results with a Varnish Removal Unit
Key Capabilities
Customer Benefits
Remove dissolved and soft varnish precursors from oil
Stabilize oil chemistry and slow oxidation processes
Prevent varnish deposition on critical surfaces
Support long-term oil reuse without system flushing
Fewer varnish-related turbine trips and sticking valves
Extended oil and component lifetime
Improved control system stability and response
Lower total operating and maintenance costs
Proven Results with a Varnish Removal Unit
What customers typically achieve*
50%
Reduction in varnish-related turbine trips and servo valve sticking events
3-5 Years
Typical extension of oil service life by removing varnish precursors continuously
ISO Target
Cleanliness and flow stability maintained in control and lubrication systems
30-40%
Reduction in corrective maintenance actions related to varnish deposits
*Results depend on application, oil type, operating conditions, contamination levels, and other outside factors
Industries Affected by Varnish Formation in Oil Systems
CJC® Varnish Removal Units are used in applications where oxidation by-products threaten reliability and control performance.
Control Varnish Formation and Protect System Reliability
Let our specialists assess your oil condition and recommend the right varnish removal solution for your system.
