DFDKW60GAC25A10 Filter

Product Introduction – RF Series Oil Return Filter

The RF Series Oil Return Filter is a high-performance filtration component specifically designed for fine filtration of return

 oil in pipeline hydraulic systems. This filter is installed directly on the tank cover plate, providing a compact, space-saving 

solution that integrates seamlessly into existing hydraulic system configurations. The RF series is engineered to deliver

 consistent, reliable filtration performance, ensuring that return oil is purified before re-entering the hydraulic reservoir,

 thereby maintaining system cleanliness and protecting sensitive components from contamination-related damage.

In hydraulic systems, return oil carries contaminants generated during system operation—including metal wear particles, 

sealing material debris, oxidation by-products, and external contaminants that have entered the system. If these contaminants

 are not effectively removed from the return oil, they recirculate through the system, causing accelerated wear of pumps, valves, 

and actuators, leading to premature component failure and increased maintenance costs. The RF series addresses this

 challenge through its robust construction, high-quality filter elements, and innovative dual-barrel design that enables 

continuous operation during maintenance.

A key distinguishing feature of the RF series is the integration of a 3-way switching ball valve that enables switching between

 two filter barrels without shutting down the system. This innovative design allows maintenance personnel to perform filter 

element replacement or servicing on one barrel while the other barrel continues to provide uninterrupted filtration. 

This capability is particularly valuable in continuous production environments where system shutdowns are costly and 

undesirable, significantly reducing maintenance downtime and improving overall operational efficiency.

Technical Parameters

Parameter Specification

Flow Rate Range 30 L/min ~ 15,000 L/min

Maximum Working Pressure 2.5 MPa

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

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

Operating Temperature -10°C ~ +100°C

Applicable Medium Mineral oil, lubricating oil, and similar hydraulic fluids

Installation Type Tank cover plate mounting

Configuration Dual barrel with 3-way switching ball valve

Filter Element Media Glass fiber / Metal mesh (selectable)

Pollution Indication Visual or electrical signal transmitter (optional)

Performance Characteristics

The RF Series Oil Return Filter is engineered with a comprehensive set of performance features that ensure reliable operation,

 convenient maintenance, and extended service life:

1. Tank cover plate mounting – The filter is designed for direct installation on the hydraulic tank cover plate, providing a 

space-saving solution that simplifies installation and maintenance access.

2. Dual-barrel switching design – The filter incorporates a 3-way switching ball valve that enables complete switching between

 two filter barrels. This allows the system to continue operating during filter element replacement, eliminating the need for

 system shutdown and minimizing production downtime. The switching mechanism is simple and reliable, enabling quick

 changeover by maintenance personnel.

3. Pollution indication system – The filter is equipped with a pollution transmitter that provides visual or electrical signal 

indication when the filter element becomes contaminated and blocked. This real-time monitoring capability alerts 

maintenance personnel when filter element replacement is required, enabling proactive maintenance and preventing

 system performance degradation. The visual indicator allows for quick on-site inspection, while the electrical signal can be 

integrated into centralized control systems for remote monitoring and automated maintenance alerts.

4. High-performance filter media – The filter element is manufactured from high-quality glass fiber material, offering exceptional

 filtration performance with advantages including:

   · High filtration accuracy for effective contaminant removal

   · Large oil flow capacity for high-volume applications

   · Low pressure loss for improved system efficiency

   · High contaminant absorption capacity for extended service life

5. Versatile media options – In addition to glass fiber elements, the RF series also offers metal mesh filter elements with coarser

 filtration grades (25, 50, 100, 200 μm). This flexibility allows users to select the optimal media type and filtration accuracy based 

on specific application requirements, operating conditions, and budget considerations.

6. Wide flow range – With flow capacities from 30 L/min to 15,000 L/min, the RF series is suitable for applications ranging from 

small machine tools to large industrial hydraulic systems. This versatility makes the RF series a standardized solution across 

multiple equipment types and operating scales.

Working Principle

The RF Series Oil Return Filter operates on the principle of mechanical filtration through depth-type filter media. Return oil from 

the hydraulic system enters the filter housing and passes through the selected filter element. Contaminants—including solid

 particles, metal debris, and oxidation by-products—are captured within the filter media structure. The purified oil then flows 

out of the filter and returns to the hydraulic reservoir, maintaining the cleanliness of the system fluid.

The dual-barrel configuration with 3-way switching ball valve enables continuous operation during maintenance. When the

 pollution indicator signals that the active filter element requires replacement, the operator simply rotates the switching valve

 to redirect oil flow to the standby barrel. The contaminated element in the first barrel can then be replaced without interrupting

 system operation. This switching capability is a significant advantage over single-barrel designs, which require complete system

 shutdown for filter element replacement.

Scope of Application

The RF Series Oil Return Filter is suitable for a wide range of industrial applications, including:

· Hydraulic systems – Return line filtration in machine tools, presses, injection molding machines, and automated production 

equipment.

· Lubrication systems – Fine filtration of return oil in circulating lubrication systems for compressors, gearboxes, and turbines.

· Steel and metallurgy – Heavy-duty hydraulic systems in rolling mills, continuous casting facilities, and material handling 

equipment.

· Mining and construction – Hydraulic systems for excavators, loaders, and other heavy equipment.

· Power generation – Turbine lubrication systems and hydraulic control circuits.

· Marine applications – Shipboard hydraulic systems and deck machinery.

Economic and Operational Benefits

· Uninterrupted system operation – Dual-barrel design enables filter element replacement without system shutdown.

· Reduced maintenance downtime – Quick and easy barrel switching minimizes production interruption.

· Extended equipment life – Effective contaminant removal protects pumps, valves, and actuators.

· Proactive maintenance – Pollution indication system enables timely filter element replacement.

· Versatile application – Wide flow range and media options suit diverse system requirements.

· Cost-effective operation – Long service life and low pressure loss reduce operating costs.

Quality Assurance

The RF Series Oil Return Filter is manufactured under strict quality control standards. Each unit undergoes comprehensive 

factory testing, including pressure integrity verification, flow performance validation, and functional testing of the switching 

mechanism and pollution indication system. The high-quality filter media and robust construction ensure reliable operation 

in demanding industrial environments.

Frequently Asked Questions (FAQ)

Q1: What is the primary function of the RF Series Oil Return Filter?

A: The RF Series Oil Return Filter is designed for fine filtration of return oil in pipeline hydraulic systems. It removes solid particles, metal debris, and other contaminants from return oil before it re-enters the hydraulic reservoir, maintaining system cleanliness and protecting components from contamination-related damage.

Q2: What is the advantage of the dual-barrel design?

A: The dual-barrel design with a 3-way switching ball valve enables continuous system operation during filter element replacement. When one barrel requires servicing, the valve simply switches oil flow to the other barrel. This eliminates the need for system shutdown, significantly reducing maintenance downtime and increasing operational efficiency.

Q3: How does the pollution indication system work?

A: The pollution transmitter provides visual or electrical signal indication when the filter element becomes contaminated and blocked. A visual indicator allows for quick on-site inspection, while an electrical signal can be integrated into centralized control systems for remote monitoring and automated maintenance alerts.

Q4: What is the difference between glass fiber and metal mesh filter elements?

A: Glass fiber elements offer high filtration accuracy (3~20 μm), low pressure loss, and high contaminant absorption 

capacity—ideal for precision hydraulic systems requiring tight cleanliness control. Metal mesh elements provide coarser 

filtration (25~200 μm) and are suitable for applications where high flow capacity and mechanical robustness are prioritized.

Q5: How often should the filter element be replaced?

A: Replacement frequency depends on system contamination levels, operating conditions, and flow rate. The pollution

 indication system signals when the element is saturated and requires replacement. Under typical operating conditions,

 elements may need replacement every 3~12 months. Regular oil analysis and pressure monitoring are recommended for 

optimized maintenance scheduling.

Q6: What is the maximum operating pressure for the RF series?

A: The maximum working pressure is 2.5 MPa. The system should be operated within this limit to ensure safe and reliable 

performance. Pressure surges exceeding this value may cause damage to the filter housing or filter element.

Q7: Can the RF series be used with different types of hydraulic fluids?

A: The RF series is suitable for mineral oil and lubricating oil. For synthetic fluids, fire-resistant fluids, or other specialty oils,

 please consult our technical team to verify compatibility of seals and materials.

Q8: Is the switching operation difficult to perform?

A: No. The 3-way switching ball valve is designed for simple, reliable operation. A clear indicator shows the active barrel, 

and the switching process takes only a few seconds. No special tools or extensive training are required.

Q9: What happens if the filter element becomes completely blocked?

A: The filter is equipped with a bypass valve (optional) that opens when the element reaches maximum differential pressure, 

allowing oil to flow around the element and preventing system starvation. However, bypass operation allows unfiltered oil to 

pass downstream, so the element should be replaced promptly when the pollution indicator signals.

Q10: Can the RF series be customized for specific requirements?

A: Yes. Custom configurations including special flow rates, filtration precision combinations, connection types, and pollution

 indication options can be arranged based on site-specific requirements. Please contact our technical team with your specific 

needs.

Q11: What is the operating temperature range for the RF series?

A: The operating temperature range is -10°C to +100°C. For applications outside this range, please consult our technical team

 for special configurations with appropriate seal materials and media options.

Q12: What maintenance is required for the switching valve?

A: The switching valve requires minimal maintenance. Periodic inspection for leakage and smooth operation is recommended.

 If the valve becomes stiff or shows signs of wear, it should be serviced according to the maintenance schedule in the operating

 manual.

Q13: What documentation is provided with each shipment?

A: Each unit ships with a factory test report, operating manual, dimensional drawings, and a spare parts list. Material certificates

 for wetted components are available upon request.

Q14: What is the typical service life of the RF Series filter?

A: The filter housing and switching mechanism are designed for long-term service life under normal operating conditions.

 With proper maintenance, the unit can provide reliable service for many years. Filter elements are consumable items that 

require periodic replacement based on system conditions.

Q15: What is the recommended installation location for the RF filter?

A: The RF filter is designed for installation directly on the hydraulic tank cover plate. This mounting configuration provides easy 

access for maintenance and minimizes piping requirements. Ensure adequate clearance around the filter for element 

replacement and valve operation.

Q16: What safety features are incorporated into the design?

A: The RF series includes a pressure relief valve to prevent overpressure, a locking mechanism on the switching valve to prevent

 accidental operation, and grounding provisions for static discharge. The housing is designed to contain any potential fluid 

leakage, and the pollution indication system provides early warning of filter saturation.

Summary

The RF Series Oil Return Filter is a high-performance filtration solution for return oil in hydraulic systems. Its innovative 

dual-barrel design with 3-way switching ball valve enables continuous system operation during filter element replacement, 

significantly reducing maintenance downtime. With a wide flow range, multiple media and precision options, and integrated 

pollution indication, the RF series provides reliable, cost-effective filtration for a broad range of industrial applications. 

The series is an essential component for maintaining hydraulic system cleanliness, protecting sensitive equipment, 

and optimizing operational efficiency.

Contact Us

For detailed datasheets, configuration advice, or project-specific quotations, please contact our technical team. We are here to

 help you find the optimal solution for your filtration needs.

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