Parker Velcon 6 in. x 27 7/8 in. DI Coalescer Filters - 4 Micron

Parker Velcon
DI - Coalescer
6 in.
27 7/8 in.
Micron Rating:
4 Micron
Product Type:
Water and Particulate
4.00 LBS
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Velcon’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.

Tiered Ratings

  • Velcon’s 4 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


  • 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


  • All filter components compatible with petroleum based diesel fuels
  • Downstream free-water level typically below 50ppm
  • Recommended change out pressure: 25 psid (1.7 bar)
  • Nitrile Rubber sealing materials standard
  • Maximum operating temperature: 150°F (65°C)
  • 6” (15.2 cm) outer diameter
  • DI - coalescer flow direction - inside to outside
  • DSO - separator flow direction - outside to inside