Bi-side switchable hydraulic pressure filter with on-line element replacement, 315bar max pressure, 2500l/min max flow, integrated venting and clogging monitoring for industrial systems.
Ayater's DFDK change-over pressure filter is engineered for high-demand industrial hydraulic systems, boasting non-stop operation via on-line filter element replacement-a game-changing design that eliminates production downtime for maintenance. It supports a maximum operating pressure of 315 bar and flow rate up to 2500 l/min, with size ranges from 30 to 3960 and modular structures (one-piece bowl, two-piece bowl, top-removable) across 1.x/2.x/3.x versions.
For safety, BH4HC robust filter elements are mandatory for systems over 20 bar, ensuring structural stability under high-pressure conditions. The filter features a version-specific venting system: 1.x/2.x models have filter head air bleed screws, while 3.x models integrate cover vent screws (max 1 rotation), eliminating air pockets and hydraulic imbalance. It also offers multi-grade filtration (001-200 μm) with element materials including ON, BH4HC, V, W/HC and W-only W, W/HC and V elements are cleanable for cost efficiency.
This concise table outlines the DFDK series' core parameters, structural variations and maintenance requirements for all model ranges:
| Model Range | Structural Type | Max Operating Pressure | Key Filter Element Code | Critical Maintenance Tool AF Width | Clogging Indicator Max Torque |
|---|---|---|---|---|---|
| 30-280 | One-piece bowl | 315 bar | 0030D-0280D | Oil drain:6/10; Air vent:5 | VD:100 Nm; A/LE/LZ:50 Nm |
| 330-660 | One-piece bowl | 315 bar | 0330D-0660D | Oil drain:32; Air vent:10 | VD:100 Nm; A/LE/LZ:50 Nm |
| 660-1320 | Two-piece bowl | 315 bar | 0660D-1320D | Oil drain:32; Air vent:10 | VD:100 Nm; A/LE/LZ:50 Nm |
| 1320-3960 | Top-removable | 315 bar | 1×/2×/3×0660D | Oil drain:36; Air vent:10 | VD:100 Nm; A/LE/LZ:50 Nm |
All models are fitted with a VD series differential pressure clogging indicator (visual/electrical/visual-electrical) with a standard 8 bar pressure setting, providing real-time filtration status feedback for proactive maintenance.
Installation and commissioning follow version-specific steps to ensure optimal performance and sealing. First, verify the system pressure does not exceed the filter's rated pressure and fit the correct element (BH4HC for ＞20 bar). Fully screw in the filter bowl, then unscrew a quarter-turn-overtightening does not enhance sealing and may damage threads.
For 1.x/2.x versions: Loosen both air bleed screws and open the spindle to balance hydraulic pressure between filter sides. For 3.x versions: Undo cover vent screws by a maximum of 1 rotation only. For all versions, switch on the hydraulic system, move the control lever to the centre to fill both filter sides, and close vent screws immediately when oil flows out. Finally, switch to a single filter side via the lever and inspect the entire unit for leakage or structural damage.
The DFDK series' on-line replacement process is designed for safety and efficiency, with no need to shut down the hydraulic system:
Confirm the currently operating filter side via the external lever and open the pressure equalisation spindle to balance pressure on both sides.
Rotate the lever 90° to switch to the standby side, then close the spindle.
Unscrew the idle side's air bleed screw (max 1 rotation) and open the oil drain plug to dispose of contaminated oil in a sealed container-unfiltered oil must never be returned to the system.
Disassemble the bowl/cover (remove grub screw for two-piece bowls) and extract the filter element, checking its surface for contamination or large particles (a sign of potential system component damage).
Clean reusable elements (W/W/HC/V) or replace disposable ones (ON/BH4HC), then clean the bowl/cover and inspect sealing surfaces for damage.
Lubricate all seals and sealing surfaces with clean operating fluid, reinstall the element and bowl (quarter-turn unscrew after full tightening), then vent the filter and check for leakage.
Regular maintenance is critical to extend the filter's service life and ensure system reliability. Filter elements must be replaced at least once a year-more frequently for high dynamic load systems, post-system repair or oil changes. Inspect O-rings, back-up rings and profile seal rings every 3 months, replacing any damaged parts to prevent leakage. Calibrate the VD clogging indicator every 6 months to maintain accurate pressure sensing.
All maintenance must be performed by qualified hydraulic technicians, with strict safety adherence: Depressurise and cool the filter before disassembly to avoid scalding from high-temperature oil; maintain a dust-free working environment to prevent secondary hydraulic system contamination; turn off power for electrical clogging indicators to avoid short circuits. Never modify the filter housing (welding, drilling, forced opening) and ensure the housing is properly earthed to prevent static build-up.
Ayater Filtration offers the full range of DFDK change-over pressure filter models, covering all size specifications and structural versions for custom hydraulic system matching.
Core Available Models: DFDK 30, DFDK 60, DFDK 110, DFDK 140, DFDK 160, DFDK 240, DFDK 280, DFDK 330, DFDK 500, DFDK 660, DFDK 990, DFDK 1320, DFDK 2640, DFDK 3960.
For product quotations, model matching, original spare parts purchase (filter elements, repair kits, sealing parts) and professional technical support, contact the Ayater Filtration team. We provide one-stop hydraulic filtration solutions tailored to your system's flow, pressure and filtration precision requirements.
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