Product Introduction
MDP Hydraulics specializes in reliable filtration solutions for high-demand hydraulic systems. The DFDK Series Change-Over High Pressure Hydraulic Oil Filter is designed for continuous operation under high pressure, allowing filter element replacement without system shutdown. Engineered as an OEM-compatible alternative to Hydac DFDK filters, it ensures clean hydraulic oil, protects critical components, and reduces downtime across industrial and mobile applications.
Contact us today for compatible models, fast delivery, and OEM support.
Key Parameters
| Item | Specification |
|---|
| Filter Type | Change-over (duplex) high-pressure inline filter |
| Nominal Pressure | 160 bar (DFDK type code 3.X) / 315 bar (DFDK type code 1.X & 2.X) |
| Fatigue Strength | 10⁶ pressure cycles from 0 to nominal pressure |
| Temperature Range | –10 °C to +100 °C (–30 °C to –10 °C: pmax 157.5 bar) |
| Filter Head Material | EN-GJS-400-15 |
| Filter Bowl Material | Steel |
| Change-Over System | Ball change-over valve (T-configuration optional) |
| Filter Bowl Design | Two-piece bowl (standard for DFDK 990–3690; optional for DFDK 660) |
| Filter Element Standards | ISO 2941, 2942, 2943, 3724, 3968, 11170, 16889 |
| Seals | NBR (Perbunan) |
| Clogging Indicator Type | VD differential pressure indicator (up to 420 bar operating pressure) |
| Indicator Pressure Setting | 8 bar (other settings on request) |
| Installation | Inline installation |
| Pressure Equalization | Pressure equalization line (DFDK 330 and above; optional for DFDK 160–280) |
Features & Benefits
Change-Over Duplex Design
Allows continuous filtration during element replacement, eliminating system downtime and ensuring uninterrupted operation in critical applications.
High-Pressure Pipeline Protection
Designed for high-pressure hydraulic circuits, effectively removing contaminants and extending the service life of pumps, valves, and actuators.
OEM-Compatible Replacement Solution
Form-fit-function compatible with Hydac DFDK and FMND series filters, simplifying maintenance and reducing replacement costs.
High Dirt-Holding Capacity
Advanced filter elements capture more contaminants, reducing replacement frequency and lowering overall maintenance expenses.
Robust Industrial Construction
Heavy-duty housing withstands harsh operating conditions, vibration, and pressure fluctuations in demanding industrial environments.
Optional Monitoring & Indicators
Supports differential pressure indicators for timely maintenance, helping prevent filter blockage and system damage.
Applications
Hydraulic Power Units: Continuous oil filtration for centralized hydraulic systems
Steel & Metallurgy Plants: High-pressure filtration in rolling mills and processing lines
Construction Machinery: Protection for pumps and valves in excavators and loaders
Oil & Gas Systems: Reliable filtration under high pressure and continuous operation
Marine & Offshore Equipment: Stable filtration in harsh and corrosive environments
FAQ
Q1: What is the advantage of a change-over (duplex) filter design?
It allows one filter element to be replaced while the other remains in operation, preventing system shutdown and production loss.
Q2: Is this filter compatible with Hydac DFDK series housings and elements?
Yes. The DFDK Series is designed as an OEM-compatible replacement for Hydac DFDK and FMND series filters.
Q3: Can this filter be used in high-pressure hydraulic systems?
Absolutely. It is specifically engineered for high-pressure pipeline applications.
Q4: What filtration ratings are available?
Multiple micron ratings are available to match different system cleanliness requirements.
