The solution isn’t frequent oil changes — it’s effective, continuous oil filtration.
ZYD Transformer Oil Purifier(Double-Stage )Key Problems in Continuous Casting Hydraulic Systems
In real production environments, hydraulic oil contamination mainly comes from:
Metal particles from pumps, valves, and cylinders
Scale and dust from high-temperature casting areas
Water ingress from cooling systems and condensation
Oxidation byproducts caused by heat and long oil cycles
Without proper filtration, these contaminants lead to:
Sticking or failed servo valves
Unstable mold oscillation
Increased hydraulic leakage
Unplanned shutdowns
Practical Filtration Solution
1. Offline (Kidney Loop) Filtration — Core Setup
Offline filtration units work independently from the main hydraulic circuit, allowing continuous cleaning without stopping production.
Recommended configuration:
High-efficiency depth filters (β ≥ 200)
Fine filtration rating: 3–5 μm
24/7 circulation, even during downtime
This setup steadily reduces particle concentration and keeps oil cleanliness within target ISO codes.
2. Water Removal and Dehydration
Water is one of the most damaging contaminants in continuous casting lines.
Effective solutions include:
Vacuum dehydration units for free and dissolved water
Water-absorbing filter elements for quick moisture control
Target moisture level: below 500 ppm (or as specified by OEM).
3. High-Temperature & High-Flow Adaptation
Filtration systems must handle:
High oil temperature
Continuous operation
Large oil volumes
Key design points:
Heat-resistant seals and filter media
Stable flow under viscosity changes
Minimal pressure fluctuation
4. Clean Oil Maintenance, Not Oil Replacement
A proper filtration system allows:
Extended oil service life
Reduced oil consumption
Lower maintenance costs
In many casting plants, oil life can be extended by 2–4 times with stable cleanliness control.
Recommended Cleanliness Targets
| Component | Suggested ISO Cleanliness |
| Servo valves | ISO 15/13/10 or better |
| Proportional valves | ISO 16/14/11 |
| General hydraulics | ISO 17/15/12 |
Maintaining these levels significantly reduces failure rates in continuous casting operations.