DFBN/HC660F5D1.X/V filter

Product Overview

The DFBN series high-pressure filters represent a state-of-the-art solution for fine filtration of hydraulic media 

within pipeline systems. Engineered for reliability and operational continuity, these filters are indispensable 

components in modern hydraulic circuits where fluid cleanliness directly impacts system performance, 

component longevity, and overall equipment reliability. The DFBN series is designed to meet the rigorous demands 

of industrial hydraulic applications, offering robust construction, versatile filtration options, and user-centric 

maintenance features that minimize downtime and enhance productivity.

Advanced Filtration Technology

At the heart of the DFBN series lies a sophisticated filtration architecture that ensures consistent removal of 

particulate contaminants from hydraulic fluids. The filter elements are available in two primary material 

configurations to address diverse application requirements:

Glass Fiber Elements: These elements deliver exceptional filtration efficiency with accuracy ratings of 3 μm, 5 μm, 10 μm,

 and 20 μm. Glass fiber media offers distinct advantages, including high filtration precision, excellent dirt-holding capacity, 

low initial pressure drop, and superior contaminant absorption energy. This makes them ideal for applications requiring

 stringent cleanliness levels, such as servo-valve protection and precision hydraulic control systems.

Metal Mesh Elements: For applications where coarser filtration is acceptable or where higher flow rates are prioritized,

 metal mesh elements provide reliable performance with accuracy ratings of 25 μm, 50 μm, 100 μm, and 200 μm. 

These elements are durable, cleanable, and suitable for a wide range of industrial environments.

The filter elements are further categorized into BH (high-pressure) and BN (low-pressure differential) types, 

allowing system designers to select the optimal element based on operating pressure and flow characteristics.

Innovative Design Features

The DFBN series incorporates several engineering innovations that set it apart from conventional pipeline filters:

Online Maintenance Capability: A key feature of the DFBN series is the integrated 3-way switching ball valve.

 This allows operators to isolate the filter chamber and replace the filter element without shutting down the hydraulic system. 

This "hot-swap" capability is invaluable in continuous production environments where unscheduled downtime carries 

significant cost penalties. The valve mechanism ensures smooth flow path switching, preventing pressure spikes or flow 

interruptions during maintenance procedures.

Contamination Monitoring: Each DFBN filter is equipped with a contamination transmitter that provides real-time indication 

of filter element condition. This monitoring system is available in both visual and electrical signal variants. When the filter 

element becomes progressively clogged with captured contaminants, the transmitter generates a warning signal, 

alerting maintenance personnel that element replacement is due. This proactive alert system prevents bypass valve opening, 

maintains filtration efficiency, and extends the service life of downstream components.

Compact Pipeline Integration: The filter is designed for direct installation into hydraulic pipelines, with a configuration

 that minimizes space requirements while maximizing filtration surface area. The compact design facilitates easy integration 

into new systems and straightforward retrofitting into existing installations.

Technical Specifications

Parameter Specification

Flow Range 30 – 1,300 L/min

Maximum Operating Pressure 31.5 MPa

Operating Temperature -10°C to +100°C

Applicable Media Mineral oil, lubricating oil

Element Types BH (high pressure), BN (low pressure differential)

Glass Fiber Accuracy 3, 5, 10, 20 μm

Metal Mesh Accuracy 25, 50, 100, 200 μm

Application Fields

The DFBN series is widely deployed across industries where hydraulic system reliability is paramount:

· Heavy Machinery: Construction equipment, mining machinery, and material handling systems

· Steel and Metallurgy: Rolling mills, continuous casting lines, and forging presses

· Power Generation: Turbine control systems and hydroelectric governor circuits

· Marine and Offshore: Ship steering systems, deck machinery, and subsea controls

· Aerospace: Ground support equipment and test stands

· Industrial Manufacturing: Injection molding machines, presses, and automated production lines

Performance Advantages

The DFBN series delivers measurable operational benefits:

Extended Component Life: By maintaining fluid cleanliness at recommended ISO levels, the filter significantly reduces 

wear on pumps, valves, actuators, and seals, extending their service life and reducing replacement costs.

Reduced Downtime: The online maintenance feature eliminates the need for system shutdown during filter changes, 

maximizing production uptime and operational efficiency.

Energy Efficiency: Low-pressure-drop element designs minimize energy consumption, reducing pumping losses 

and operating costs over the filter's service life.

Versatility: With multiple element accuracy options and two element type categories, the DFBN series can be tailored to 

suit virtually any hydraulic application, from low-pressure circulation systems to ultra-high-pressure servo circuits.

Frequently Asked Questions

Q1: What is the difference between BH and BN filter elements?

BH elements are designed for high-pressure applications and feature reinforced construction to withstand elevated

 differential pressures. BN elements are optimized for low-pressure-drop performance, making them suitable for return-line

 or low-pressure circulation systems where minimal flow resistance is critical.

Q2: How do I know when to replace the filter element?

The contamination transmitter provides a clear indication when the element approaches its clogging limit. For visual indicators, 

a colored zone shows the contamination level; for electrical versions, a signal is sent to the control system. As a general

 guideline, replace the element when the pressure differential reaches the manufacturer's specified change value.

Q3: Can I switch the filter while the system is under full pressure?

Yes, the integrated 3-way switching ball valve is designed for full-pressure operation. The valve allows smooth transfer of flow

 from the service chamber to the standby position, enabling safe element replacement without system shutdown. Always

 follow the manufacturer's operating instructions to ensure proper switching sequence.

Q4: Are the glass fiber elements reusable or cleanable?

Glass fiber elements are disposable and should be replaced when saturated. They offer superior dirt-holding capacity but 

are not designed for cleaning. Metal mesh elements, however, can be cleaned and reused in many applications, depending

 on the contaminant type and cleaning method employed.

Q5: What fluid compatibility does the DFBN series support?

The standard seals and materials are compatible with mineral oils and lubricating oils. For phosphate esters, water-glycol fluids, 

or other specialty hydraulic media, please consult the manufacturer for appropriate seal material options.

Q6: How does the contamination transmitter work?

The transmitter continuously monitors the pressure differential across the filter element. As contaminants accumulate, 

the differential pressure rises. When a preset threshold is reached, the transmitter activates an alarm (visual light or electrical 

contact) indicating that service is required. This ensures timely maintenance and protects the system from bypass valve 

activation.

Q7: What is the recommended installation orientation?

The DFBN series filter can be installed in any orientation; however, vertical installation with the filter head upward is

 recommended for ease of maintenance and optimal air bleeding during system startup.

Q8: Does the filter include a bypass valve?

Yes, all DFBN series filters are equipped with a bypass valve that opens if the filter element becomes severely clogged and

 is not replaced in time. This safety feature ensures that the system continues to receive oil flow, preventing pump cavitation 

or component starvation, while the contamination indicator signals the need for service.

For additional technical support, custom configurations, or application-specific recommendations, please contact our 

engineering team. The DFBN series is continuously improved, and specifications are subject to change without prior notice.

Product details