Three Main Filter Types
|
Type |
Location |
Pressure |
Precision |
Function |
|
Return Filter |
Return line → before tank |
≤1.6 MPa |
10-30μm |
Final cleaning before oil returns to tank |
|
Pressure Line Filter |
Pump outlet → before valves |
10-35 MPa |
1-10μm |
Protects servo valves, proportional valves, etc. |
|
Suction Filter |
Pump inlet |
Negative pressure |
80-180μm |
Protects pump (coarse filtration) |
One-Sentence Selection Guide
Protecting precision valves → Pressure line filter (high pressure rating, high precision)
Keeping tank clean → Return filter (high flow capacity, with bypass valve)
Protecting the pump → Suction filter (cannot be omitted)
Three Common Misconceptions
❌ Higher precision is always better → ✅ Choose appropriately; too high = high pressure drop & short service life
❌ Return filter eliminates need for suction filter → ✅ Different roles, cannot replace each other
❌ A filter can be used indefinitely as long as it's not torn → ✅ Clogged filters cause high pressure drop — replace regularly
Practical Tips
Replace filter elements for the first time after 100-200 hours of operation on a new system
When the filter clogging alarm triggers, replace promptly — don't rely on bypass
In dusty environments, upgrade the tank breather filter as well
💡 Alternative Brand Solutions
We offer high-quality replacement filters for major brands. Our products are fully compatible with:
Hydac — Return, pressure, and suction filter elements
Pall — Industrial and high-pressure hydraulic filters
✓ Same mounting dimensions — direct drop-in replacement
✓ Comparable filtration precision and β-ratio
✓ More cost-effective with shorter lead times
Need a replacement for a specific model? Please provide the OEM part number, and we will confirm the cross-reference for you.
Key takeaway: Return filter cleans the tank, pressure filter protects precision components, suction filter guards the pump.
