Decoding The DFZ Filter Model Code

Selecting the right hydraulic filter is critical for system performance and longevity. Ayater's DFZ series uses a precise alphanumeric model code that encodes all essential specifications into a single string. Understanding this code is the first step in making an informed decision. This guide will break down each segment of the model code, from filter type and size to element material and clogging indicator options, empowering you to specify exactly what your hydraulic system requires.

The model code follows a logical sequence: DFZ [Media] [Size] [Pressure] [Connection] [Accuracy] [Indicator] [Version] [Options]. Each part of the code corresponds to a specific feature, ensuring there is no ambiguity in the filter's configuration. Whether you need a high-pressure filter for a mobile application or a fine-filtration unit for a precision machine tool, the model code provides all the information you need.

Step 1: Determine Flow Rate and Pressure

Start by identifying the flow rate (l/min) and operating pressure (bar) of your hydraulic circuit. This will dictate the filter size (30, 60, 110) and confirm the pressure rating (Q for 315 bar). For example, a system with a 50 l/min flow rate and 250 bar pressure would require at least a DFZ 110 size filter.

Step 2: Choose the Right Filtration Media

Next, select the filtration media based on your system's pressure and contamination control needs. For high-pressure circuits (>20 bar), choose BH4HC, OH/PS, or V media (210 bar rating). For low-pressure or pulse applications, ON or ON/PS (20 bar rating) are suitable. Consider the fluid type and operating temperature as well-Metal Fibre (V) is ideal for high temperatures.

Step 3: Select Filtration Accuracy

Determine the required filtration accuracy (µm) based on the sensitivity of your system components (e.g., servo valves require 1-5 μm filtration, while gear pumps may tolerate 10-20 μm). The cleaner the fluid, the longer the component life and the more reliable the system.

Step 4: Specify Connection and Indicator

Choose the connection type (B or C) that matches your existing hydraulic manifold or piping. Finally, select a clogging indicator (A, BM, C, D) based on your monitoring preferences-from a simple blanking plug to a fully integrated electrical signal for PLC control.

Ayater understands that standard solutions may not always fit. The DFZ series offers a range of supplementary options to tailor the filter to your exact needs:

Seal Material (-V): Upgrade to FPM (Viton®) seals for enhanced resistance to high temperatures and aggressive fluids.

Fluid Compatibility (-W): Specify compatibility with HFA/HFC fire-resistant emulsions for applications in high-risk environments like steel mills.

Service Access (-1): Request service access on the left side ('A' side) to accommodate specific machine layout constraints.

Indicator Lights: Choose from various voltage options (-L24, -L48, etc.) or an LED indicator (-LED24) for clear, immediate status visibility.

By leveraging these customization options, you can ensure that your DFZ filter is not just a component, but a perfectly integrated solution for your hydraulic system.