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



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