DI Series Coalescer

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Parker’s DI coalescers in combination with DSO separators, contaminated fuels are cleaned to a level that meets stringent downstream fuel cleanliness standards for petroleum based diesel fuels.

The first stage in the DI coalescer removes particles through an inside-out flow and coalesces emulsified water into large droplets, which then fall to the housing sump. In the second stage, an outside-in process, the DSO separator creates a hydrophobic barrier to block the coalesced water droplets from flowing downstream of the housing. This multi-stage design assures the fuel is conditioned to a clean and dry state, ready for use.


  • Water coalescing is not effective in the presence of fuels containing high levels of surfactants/alcohols or unrefined biofuels
  • Detergents and additives inhibits the ability of coalescers to effectively remove water by reducing Interfacial Tension (IFT) and can eventually disarm coalescers
  • Contact Parker Laboratories for further analysis of your fuel for presence of surfactants
  • Coalescing not recommended for Biodiesel blends over 5% (B5)

Tiered Ratings

  • Parker’s 5 micron coalescer combines leading-edge particle removal with world-class coalescing technology to provide optimal fuel cleanliness
  • The 10 and 25 micron rated filter coalescer provides effective particle removal with industry proven coalescing technology.


  • Extended equipment uptime
  • Reduced operating costs
  • Reliable fuel injector performance
  • Improved equipment uptime
  • Reduced fuel system maintenance


  • Multi-layer pleated filtration layers using engineered fiber blends for solids retention. Sequenced coalescing materials to grow large water droplets from emulsified water.
  • All filter components compatible with diesel and biodiesel blends
  • Inside diameter: 3.5 in (88.9 mm)
  • Outside diameter: 6 in (152.4 mm)
  • DI - coalescer flow direction - inside to outside
  • DO - coalescer flow direction - outside to inside (DVX Series)
  • DSO - separator flow direction - outside to inside
  • Recommended change out pressure: 25 psid (1.7 bar)
  • Downstream free-water level typically below 50 ppm
  • Nitrile sealing materials are standard
  • Maximum Operating Temperature: 150°F (65°C)
  • End cap configuration options
    - Double open end
    - Threaded base
  • Maximum burst pressure: 75 psi (5.2 bar)
  • pH range (continuous operation): 5-9



Medium groepBrandstoffen: Diesel (B10, B30, B100), Marine Diesel, HVO, Biodiesel, Petroleum, FAME
FunctionWater Coalescer
Micron Rating5
Maximum Flow Rate (GPM)76 GPM
Flowrate Diesel (GPM)76 GPM
Maximum Flow Rate (LPM)287 LPM
Flowrate Diesel (LPM)287 LPM
Recommended changeout (psi)25 psi
Recommended changeout (bar)1.7 bar
Maximum operating temperature (°F)150 °F
Maximum operating temperature (°C)65 °C
Suitable forBiodiesel (DIESEL / FAME)
Biodiesel (DIESEL / HVO)
Diesel Fuel
Water removal free and emulsified < PPMyes
Internal diameter - Element (inch)3.5 inch
Internal diameter - Element (mm)88.9 mm
External diameter - Element (inch)6 inch
External diameter - Element (mm)152.4 mm
Overall length (Inch)33 inch
Overall length (mm)838 mm
End Cap ConfigurationThreaded Base
PH Range (continuous operation)5-9
Collapse Pressure (bar)5.2 bar
Collapse Pressure (psi)75 psi
MerkParker Velcon

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