Twin-barrel return filter – online change, ≥99% efficiency.

SRFB Twin-Barrel Direct Return Oil Filter | Product Update

Product Overview

The SRFB twin-barrel direct return oil filterfeatures a direct return design with a compact structure, 

making filter element replacement and tank oil filling quick and convenient. The twin-barrel configuration

 supports online switching, allowing filter element replacement or tank maintenance without system shutdown,

 significantly reducing downtime and improving equipment availability.

Each filter head is equipped with two M18×1.5 oil ports, and the contamination indicator can be flexibly installed 

at either location to accommodate different system layout requirements.

Key Features & Benefits

· Direct Return Design for Easy Maintenance – Return oil flows directly back to the tank, simplifying filter element

 replacement and oil filling procedures without complex disassembly.

· Twin-Barrel Structure for Online Switching – The dual-barrel design enables filter element replacement without 

interrupting system operation, ensuring continuous production and higher efficiency.

· Diffuser for Bubble Reduction – A diffuser is installed at the end of the return oil cylinder, allowing return oil to 

flow smoothly into the tank with minimal bubble generation. This reduces air re-entry and minimizes disturbance 

to settled contaminants, helping maintain tank bottom cleanliness.

· High-Performance Filter Media – The filter element is made of advanced chemical fiber material, offering high

 filtration precision, large oil flow capacity, low initial pressure drop, and high contaminant-holding capacity.

· High Filtration Efficiency – Filtration accuracy is rated by filtration ratio, with β₃.₅, β₁₀, β₂₀ > 100 and filtration 

efficiency η ≥ 99%, in full compliance with ISO standards.

· Flexible Indicator Installation – Each filter head features two M18×1.5 ports, allowing the contamination indicator 

to be installed at the most convenient location for system integration.

Technical Specifications

Parameter Specification

Product Series SRFB

Configuration Twin-barrel, direct return

Filter Element Material Advanced chemical fiber

Filtration Ratio β₃.₅, β₁₀, β₂₀ > 100

Filtration Efficiency η ≥ 99%

Indicator Port M18×1.5 (2 ports per filter head)

Installation Type Direct return (top-mounted on tank)

Compliance ISO standards

Application Fields

The SRFB twin-barrel direct return oil filter is widely used across various 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; air 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, large precision machinery, tobacco processing equipment, 

and spraying equipment.

Summary

The SRFB twin-barrel direct return oil filter combines compact design, high-efficiency filtration, and online

 maintenance capability. With advanced chemical fiber filter media, ISO-compliant filtration performance, 

and flexible indicator installation, it provides reliable contamination control for hydraulic and lubrication 

systems across a broad range of industries.

FAQ (Frequently Asked Questions)

Q1: What does "direct return design" mean, and what are its advantages?

A: The "direct return design" means return oil flows directly back to the tank through the filter, 

without additional piping. This simplifies filter element replacement and oil filling procedures, 

eliminates complex disassembly steps, and makes routine maintenance faster and more convenient.

Q2: What is the main advantage of the twin-barrel configuration?

A: The twin-barrel design enables online switching — one barrel can be taken offline for filter element 

replacement or maintenance while the other continues operating. This allows filter changes without

 system shutdown, significantly reducing downtime and improving equipment availability.

Q3: What is the filtration performance of this filter?

A: The filter element is made of advanced chemical fiber material, achieving a filtration ratio

 of β?.?, β??, β?? > 100 and filtration efficiency η ≥ 99% , fully compliant with ISO standards.

 It offers high filtration precision, large oil flow capacity, low initial pressure drop, 

and high contaminant-holding capacity.

Q4: How does the diffuser benefit the hydraulic system?

A: The diffuser is installed at the end of the return oil cylinder, allowing return oil to flow smoothly into

 the tank with minimal bubble generation. This reduces air re-entry into the system, 

minimizes disturbance to settled contaminants at the tank bottom, and helps maintain overall tank 

cleanliness — protecting the pump and other components from resuspended particles.

Q5: Where can the contamination indicator be installed?

A: Each filter head is equipped with two M18×1.5 oil ports, allowing the contamination indicator 

to be flexibly installed at either location. This accommodates different system layout requirements

 and provides installation flexibility.

Q6: What is the installation type of this filter?

A: The filter features a direct return (top-mounted on tank) installation type, making it suitable for 

applications where space is limited and easy access is required for maintenance.

Q7: What industries and applications is the SRFB filter best suited for?

A: The SRFB twin-barrel direct return oil filter is widely used across multiple industries:

· Metallurgy – rolling mills, continuous casting machines, lubrication equipment

· Petrochemical – refining, chemical processing, oil well injection water, natural gas filtration

· Textile – polyester melt filtration, air compressor protection, compressed gas purification

· Electronics & Pharmaceutical – RO water treatment, deionized water, washing liquids, glucose pretreatment

· Thermal & Nuclear Power – gas turbine oil purification, boiler lubrication, speed control, 

bypass control systems

· Mechanical Processing – paper machinery, mining equipment, injection molding machines, 

precision machinery

Q8: Does the filter support online maintenance without system shutdown?

A: Yes. The twin-barrel configuration allows online switching, enabling filter element replacement 

or tank maintenance without interrupting system operation. This ensures continuous production 

and higher equipment availability.

Q9: What are the key performance advantages of this filter?

A: The SRFB filter offers:

· Direct return design for easy maintenance and oil filling

· Twin-barrel structure for online switching and zero downtime

· Diffuser for bubble reduction and tank cleanliness

· Advanced chemical fiber media for high precision, high flow capacity, and long service life

· Filtration efficiency η ≥ 99% with β > 100

· Flexible indicator installation with two M18×1.5 ports per filter head

· ISO compliance ensuring international quality standards

Q10: What is the product series and configuration of this filter?

A: The product series is SRFB, featuring a twin-barrel, direct return configuration with advanced 

chemical fiber filter elements and ISO-compliant filtration performance.

Q11: Can this filter be used to replace an existing filter of a different brand?

A: For retrofit applications, please consult our technical team with your existing filter specifications 

and system requirements. We will verify compatibility regarding flow rate, pressure rating, 

connection type, and filtration performance to ensure a proper replacement solution.

Q12: What is the overall value proposition of this filter?

A: The SRFB twin-barrel direct return oil filter delivers:

· Continuous operation through online switching capability

· Reliable contamination control with η ≥ 99% and β > 100

· Low maintenance effort through direct return design and easy access

· System protection with bubble reduction and minimized contaminant disturbance

· Flexible integration with adjustable indicator placement

· Broad industry applicability across metallurgy, petrochemical, power generation, and more

· Cost-effective operation with reduced downtime and extended component life

Contact Us

For detailed technical data, model selection assistance, or customized configurations, 

please contact our technical team. 

We are ready to help you find the right filtration solution for your application.