RFA return filter – clean oil, reliable hydraulics, extended component life.

Product Introduction

The RFA Series Hydraulic Return Oil Filter is designed for installation on the return oil line of hydraulic systems. 

During system operation, hydraulic components generate abrasive particles and contaminants that can

 compromise fluid cleanliness. By installing this filter on the return line, these impurities are effectively captured 

before re-entering the oil tank, ensuring sustained system cleanliness and reliability.

The filter's allowable differential pressure ranges from 0.3 to 0.5 MPa, depending on the system pressure level, 

while filtration precision is selected based on the required oil cleanliness standards.

Technical Specifications

Parameter Details

Brand Aite Environmental Protection

Model Series RFA Series

Filter Material Stainless Steel

Nominal Flow Rate 25 – 1000 L/min

Nominal Pressure 1.6 MPa

Filtration Precision 1 – 30 μm (selectable)

Nominal Diameter 15 – 90 mm

Connection Method Threaded / Flange

Key Features

1. Easy Installation & Compact System Layout

The filter mounts directly onto the oil tank cover, with the filter head exposed above the tank and the

 return cylinder submerged in the oil. Threaded or flange connections on the inlet simplify piping, 

reduce system footprint, and make installation significantly more convenient.

2. Built-in Contamination Indicator & Bypass Valve for Enhanced Reliability

When the filter element becomes clogged, or when low oil temperature or flow pulsation causes the 

inlet pressure to reach 0.35 MPa, the built-in signaling device activates an alert – indicating the need

 for element replacement or oil warming. Should immediate shutdown be impractical, the integrated 

bypass valve (opening pressure: 0.4 MPa) automatically opens to maintain system operation, 

protecting both the filter and the hydraulic system from damage.

3. Straight-Through Design for Easy Maintenance & Oil Replenishment

Simply unscrew the filter cover (cleaning cover) to replace the filter element or add oil to the tank. 

The filter head is equipped with two M18×1.5 oil ports, allowing installation of a contamination transmitter on either side, 

or convenient return of small oil flows to the tank for filtration.

4. Flow Diffuser for Bubble-Free Return

A diffuser is strategically positioned at the bottom of the return cylinder, ensuring that returning oil flows smoothly 

into the tank with minimal turbulence. This effectively reduces air entrainment and bubble formation, 

preventing aeration-related issues in the hydraulic system.

5. High-Performance Glass Fiber Filter Element

The filter element utilizes advanced glass fiber filtration media, offering exceptional filtration precision,

 high flow capacity, low initial pressure loss, and substantial dirt-holding capacity – ensuring long service

 life and consistent performance.

FAQ 

Q1: Where is the RFA series filter typically installed?

A: It is installed on the return oil line of hydraulic systems, positioned directly on the oil tank cover

 with the return cylinder submerged in the oil.

Q2: What filtration precision can this filter achieve?

A: The RFA series offers selectable precision from 1 to 30 μm, allowing customization based on your 

system's cleanliness requirements.

Q3: How does the bypass valve work, and when does it activate?

A: The bypass valve automatically opens at a pressure differential of 0.4 MPa, allowing oil to flow around

 a clogged filter element. This prevents system shutdown while protecting the filter from structural damage.

Q4: What does the signaling device indicate?

A: When the inlet pressure reaches 0.35 MPa due to clogging, low temperature, or flow pulsation, 

the device sends an alert signal, prompting timely filter replacement or oil warming.

Q5: Why use glass fiber filter media?

A: Glass fiber media offers high filtration precision, large dirt-holding capacity, low pressure loss, 

and excellent flow characteristics, making it superior to conventional metal mesh or paper elements.

Q6: Can this filter be used with any hydraulic fluid?

A: Yes, it is compatible with most mineral-based hydraulic oils, synthetic fluids, and water-glycol emulsions

 within the specified viscosity and temperature ranges.

Q7: What connection options are available?

A: The filter is available with either threaded or flange connections, with nominal diameters ranging

 from 15 to 90 mm to suit various system configurations.

Q8: How do I replace the filter element?

A: Simply unscrew the filter cover (cleaning cover), remove the used element, insert a new one, 

and resecure the cover – all without draining the tank or disconnecting pipes.

Q9: What is the diffuser at the bottom for?

A: The diffuser ensures smooth oil return with minimal turbulence, reducing bubble formation and 

preventing air from re-entering the hydraulic system.

Q10: What is the maximum operating pressure?

A: The nominal pressure rating is 1.6 MPa, with an allowable differential pressure range of 0.3–0.5 MPa

 depending on the system design.

Product Details