Glass fiber filtration with 3-way valve – no downtime for element replacement.

Product Overview

The RFD series Hydac filter units are designed for fine filtration of hydraulic system media, ensuring reliable 

contamination control and system protection. These units feature a three-way switching ball valve that allows 

filter element replacement without system shutdown, significantly reducing maintenance downtime.

For DN150 and smaller connections, the three-way switching valve utilizes a spherical switching design, 

while models with connections greater than DN200 are equipped with rotary valves and butterfly valve 

conversion for enhanced flow control.

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Key Features

· Online Maintenance Capability – The integrated three-way switching ball valve enables filter element 

replacement without interrupting system operation, maximizing uptime.

· Flexible Valve Configurations – Spherical switching valve for DN150 and below; rotary valve with butterfly 

valve conversion for DN200 and above, ensuring optimal flow control across different system sizes.

· Sturdy Mounting Design – The filter can be securely fixed to the system via mounting angles located at the 

bottom of the unit, providing stable and vibration-resistant installation.

· Real-Time Contamination Monitoring – Equipped with a differential pressure contamination indicator

 (visual or electrical), which signals when the filter element is clogged, alerting maintenance personnel to 

perform timely replacement.

· High-Performance Filter Elements – Manufactured from glass fiber filter media, offering high filtration 

precision, large flow capacity, low initial pressure loss, and high contaminant-holding capacity.

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Technical Specifications

Parameter Specification

Filtration Media Glass fiber filter element / Metal mesh filter element

Filtration Accuracy (Glass Fiber) 3, 5, 10, 20 μm

Filtration Accuracy (Metal Mesh) 25, 50, 100, 200 μm

Port Configuration Inlet and outlet on same side (front of filter); inlet on top, outlet on bottom

Operating Temperature -10°C to 110°C

Applicable Fluids Mineral oil, lubricating oil

Switching Valve (DN ≤ 150) Three-way spherical switching valve

Switching Valve (DN ≥ 200) Rotary valve with butterfly valve conversion

Application Fields

The RFD series Hydac filter units are widely used across diverse industries:

1. Metallurgy – Filtration for hydraulic systems in rolling mills, continuous casting machines, and various 

lubrication equipment.

2. Petrochemical – Separation and recovery of products and intermediates in refining and chemical processing;

 particle removal filtration for oil well injection water and natural gas.

3. Textile – Purification and uniform filtration of polyester melt during drawing processes; compressor protection 

filtration; removal of oil and water from compressed gas.

4. Electronics & Pharmaceutical – Reverse osmosis water treatment, deionized water filtration, washing liquids, 

and glucose pre-treatment filtration.

5. Thermal & Nuclear Power – Oil purification for gas turbines, boiler lubrication systems, speed control systems,

 bypass control systems, feed water pumps, fans, and dust removal systems.

6. Mechanical Processing Equipment – Lubrication systems and compressed air purification for paper machinery, 

mining equipment, injection molding machines, and large precision machinery; filtration for tobacco processing 

and spraying equipment.

Representative Models

The following models are available for various flow and pressure requirements:

· DFPBN/HC330QD10D1.X/-L24

· DFPBN/HC280QC10D1.X/-L24

· DFPBN/HC240QC10D1.X/-L24

Summary

The RFD series Hydac filter units offer a reliable, high-performance solution for hydraulic and lubrication system fine

 filtration. With online maintenance capability, robust valve configurations, high-efficiency glass fiber filter elements, 

and real-time contamination monitoring, they provide effective protection for critical equipment across a wide 

range of industries.

Contact Us

For detailed technical datasheets, model selection assistance, or customized configurations, please contact our 

technical team. We are ready to help you find the ideal filtration solution for your application.