Return-line safeguards
fluid cleanliness

Application:

The Return Filter is an essential part of any hydraulic system. In many instances, it is the only “system protection” provided and therefore must be carefully chosen to ensure maximum system efficiency and should be sized for the maximum flow of the hydraulic system.

With their advanced production technology UFI Return Filters play a critical role in your system by ensuring that the fluid is kept free from solid contaminants, generated by deterioration of system components, that enter the oil reservoir and ultimately return to the system through the suction lines.

Contamination introduced through complete component failure or repairs made to system piping or flexible lines will be efficiently removed by UFI Return Filter, that guarantee clean fluid being returned to your tank and further extend your system and fluid life.

With the inclusion of UFI bypass valve, UFI Return Filters can tolerate wide flow variations without damage or element collapse. This permits more system efficiency and lower costs. UFI bypass valves are manufactured with large flow passages that provide low flow differentials and offer maximum protection to system, filter and element in the event of high flow surges. These high flow surges will allow contaminated fluid into the tank and should be avoided by correct sizing of the filter taking all operating parameters into account.

To avoid “foaming” in the reservoir, the return flow-pipe must be located below the liquid level in the tank. As a general “rule of thumb,” the distance between the bottom of the reservoir-tank and the end of the return-pipe should be more than 2 to 3 times larger than the pipe diameter.

User Benefits:

Space-saving “tank-top” mounting avoids excessive piping. Externally-mounted filters, keep contamination outside of the tank- reservoir and are often more accessible for filter element replacement. 
Main benefits:

  • Light-weight / compact-design. Tank-reservoir filling via the top-cap
  • System cleanliness conservation
  • Ease of maintenance and filter element replacement
  • Built-in air breathers available
  • Integral filter element by-pass valves
  • Increased life of system components,
  • Higher machine utilization with less down time,
  • Significantly lower maintenance costs.

FRA – RFM

Qmax 700 l/min

Materials

Head and cover : Aluminium alloy

Bowl :
Polyammide for FRA21-31-32-33-41
Zinc plated steel for FRA11-42-51-52- 53-5D

Bypass valve: Polyammide

Seals: NBR Nitrile (FKM Fluoroelastomer on request)

Indicator housing: Brass

Pressure

Max. working: 300 kPa (3 bar)

Collapse, differential for the filter element (ISO 2941): 300 kPa (3 bar)

Bypass valve

Setting: 170 kPa (1,7 bar) ± 10%

Working temperature

From -25° to +110° C

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FRB – RFA

Qmax 140 l/min

Materials

Head : Aluminium alloy

Cover and Bowl :Polyammide

Bypass valve: Polyammide

Seals: NBR Nitrile

Indicator housing: Brass

Pressure

Max. working: 700 kPa (7 bar)

Collapse, differential for the filter element (ISO 2941): 300 kPa (3 bar)

Bypass valve

Setting: 170 kPa (1,7 bar) ± 10%

Working temperature

From -25° to +110° C

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FRC – MAR

Qmax 200 l/min

Materials

Head : Aluminium alloy

Spin-on cartridge: Steel

Bypass valve: Polyammide

Seals: NBR Nitrile

Indicator housing: Brass

Pressure

Max. working: 700 kPa (7 bar)

Collapse, differential for the filter element (ISO 2941): 300 kPa (3 bar)

Bypass valve

Setting: 170 kPa (1,7 bar) ± 10%

Working temperature

From -25° to +110° C

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FRD – MRH

Qmax 1500 l/min

Materials

Cover & housing: Anodized aluminium alloy

For 61&62 only: Cover: anodized aluminium alloy

Housing: steel

Bypass valve: Steel

Seals: NBR Nitrile (FKM - on request fluoroelastomer)

Indicator housing: Brass

Pressure

Max. working: 2 MPa (20 bar)

Collapse, differential for the filter element (ISO 2941): 1 MPa (10 bar)

Bypass valve

Setting: 300 kPa (3 bar) ± 10%

Working temperature

From -25° to +110° C

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FRF – RFC

Qmax 2200 l/min

Materials

Head and cover: Aluminium alloy

Diffusor: Zinc plated steel

Element support:
Polyammide (aluminium alloy for FRF3+ and FRF4+)

Magnetic core: Syntherized magnetic material

Seals: NBR Nitrile (FKM Fluoroelastomer on request)

Indicator housing: Brass

Pressure

Max. working: 1 MPa (10 bar)

Collapse, differential for the filter element (ISO 2941): 1 MPa (10 bar)

Bypass valve

Setting: 150 kPa (1,5 bar) ± 10%

Working temperature

From -25° to +110° C

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FRG – RSC

Qmax 2400 l/min

Materials

Diffusor: Zinc plated steel

Element support: Polyammide (aluminium alloy for FRG3+ & FRG4+)

Magnetic core: Syntherized magnetic material

Seals: NBR Nitrile (FKM Fluoroelastomer on request)

Pressure

Collapse, differential for the filter element (ISO 2941): 1 MPa (10 bar)

Bypass valve

Setting: 170 kPa (1,7 bar) ± 10%

Working temperature

From -25° to +110° C

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FRH

Qmax 200 l/min

Materials

Head and cover: Aluminium alloy

Bowl: Polyammide

Bypass valve: Polyammide

Seals: NBR Nitrile (FKM Fluoroelastomer on request)

Indicator housing: Brass

Pressure

Max working: 300 kPa (3 bar)

Collapse, differential for the filter element (ISO 2941): 300 kPa (3 bar)

Bypass valve

Setting: 170 kPa (1,7 bar) ± 10%

Working temperature

From -25° to +110° C

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