RMF Systems Bypass Units – BPUW2A

RMF Systems By-pass filters are specifically designed for mobile hydraulic installations and are available in single or double units which are equally suitable for OEM use and retrofitting.  The By-pass filter comes equipped with an integrated pressure compensated flow control valve.  This valve bleeds oil from the main hydraulic system, passes through the filter after which it is returned to the hydraulic reservoir.  The amount of oil extracted from the main system at any time is insignificant ensuring that it will not affect the working of the main system.

The hydraulic market accepts that 80% of mechanical failures are caused by contamination of the oil.  The RMF Systems By-pass filters attack this contamination at source and in addition to solid particles, these filters are also capable of removing water from the oil.  This prevents the catalytic reaction of water and solid particle contamination, resulting in extended usable oil life.  The use of RMF Systems By-pass filters means less defects, less maintenance, and less wear and tear of the hydraulic components.

The By-pass filters can also be equipped with special water absorbing pre-filters in the case of extreme water contamination, these water absorbing spin-on cans will remove most of the water prior to the fluid reaching the cellulose element.  RMF Systems water absorbing filters are By-Pass filters that use a special water absorbing spin-on as a pre-filter.  The fluid is pumped through the pre-filter which removes most water and larger solid particles, in the second stage the fluid passes through the RMF micro filter where final water removal takes place as well as solids removal down to 0.5 micron.

  • Excavators
  • Wheel loader
  • Forestry machines
  • Asphalt machines
  • Concrete pumps
  • Aviation ground support equipment
  • Agricultural machines


  • Extremely clean oil due to high filtration efficiency
  • Prevention of channel forming by radial filtration direction
  • Large dirt and water holding capacity
  • Compact and easy maintenance
  • Environmentally friendly elements available
  • Longer usage life for oil and components
  • Reduces cost of ownership


Product Specs

Filter housing material:     Anodised Aluminium

Seal material:      NBR or FPM (see ordering code)

Nominal flow:      4.2 l/min

By-Pass opening pressure:    6.2 bar (at 0 bar back pressure)

Suitable elements:      Cellulose and Glass Fiber

Min. overhead clearance for element removal:  400 mm

Operating pressure flow control valve:   12 – 420 bar

Max. pressure filter housing:    20 bar

Max. oil temperature:     80 °C

Dirt indicator:       Pressure gauge (0 – 10 bar)

Inlet connection:      ¼” BSP female

Outlet connection:      ½” BSP female

Max. water absorption capacity:    1.2 l (with 30A5 element)

Max. tank volume:      ± 1500 l

Fluid compatibility:      Hydraulic mineral fluids according to ISO 2943

Approximate weight:     17.0 kg

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