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Parker Velcon, OS Series, Aviation & Industrial Coalescer Filter Cartridges
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Parker Velcon, OS Series, Aviation & Industrial Coalescer Filter Cartridges


The OS Series combination coalescer/separator cartridges Filter dirt and remove water from aviation and diesel fuels. Performance is improved due to Teflon® coated screen separators and reliable radial sump seals.

Designed for superior performance in Velcon VF-61, VF-61E & VF-609 Housings, Facet's VFCS-21 & VFCS-22 Filter/Separator Vessels & Racor's FBO-10 & FBO-14 Housings


  • Can be used with pre-mixed fuel containing anti-icing additive
  • One piece replacement combination coalescer and separator cartridge
  • OS-51288 Cartridge: Laboratory tested to 0.2% water in incoming fuel, 10 ppm in effluent*
  • Teflon® coated screen separator
  • Reliable radial sump seal design
  • Nominal 0.5 micron particle eiciency for jet fuel and avgas; 5 micron for diesel fuel
  • Minimum 75 psid collapse strength
  • Flow direction – outside to inside
  • Operating temperatures up to 240°F (115°C)
  • 5 - 9 operating pH range


Flow is from outside to inside through the cartridge. Coalesced water is repelled by the separator and drops to the sump for daily draining. Clean, dry fuel exits the cartridge through the nozzle at the top.

Replace the cartridge when the differential pressure exceeds 15 psi or after 1 year of service, whichever occurs Arst.

*Because of the limited sump space in these vessels, IT IS IMPERATIVE to drain the sump at EVERY FUELING. It is also important to recognize that these OS cartridges by themselves do not provide a water defense system. One water defense option is to use the Water Detection Probe, Velcon part number 125-Q.

General Specification
Filter Type:Coalescer/Separator
Filter Consruction:Teflon Coated Separator with Coalescer/Filter
Seal Material:Buna-N
Maximum Operating Temperature:66-71 °C, 150-160 °F
Maximum Pressure Differential:75 psi, 5.2 bar
Changeout Pressure Differential:15 psi, 1 bar
pH Range:Continuous Operation: 5 - 9
Flow Rate:Depends on Fluid viscosity and application. See brochure for more information.
Application:Aviation, Aviation & Industrial, Military Aviation, Industrial

*EI (Energy Institute) is the new specification authority. API (American Petroleum Institute) is no longer involved in aviation fuel filtration specifications.

Cartridge Selection Table
Model NumberTypeHousingMediaApplicationOutside Dia. (in.)Length (in.)Micron RatingCollapse Pressure (PSI)Flow Rate (US GPM)Max. Op. Temp.Data Sheet
OS-51288Coalescer / SeparatorVF-61, VF-61EJet Fuel, AvgasDirt & Free Water611,3/40.5 @ Nom.75 115 °C, 240 °F 
OS-60988Coalescer / SeparatorVF-609 or VFCS-21 or FBO-10Jet Fuel, AvgasDirt & Free Water690.5 @ Nom.75 115 °C, 240 °F1858
OS-61288Coalescer / SeparatorVFCS-22 or FBO-14Jet Fuel, AvgasDirt & Free Water6130.5 @ Nom.75 115 °C, 240 °F 
OS-51286Coalescer / SeparatorVF-61DieselDirt & Free Water611,3/45 @ Nom. @ 98% Efficiency75 115 °C, 240 °F 
OS-60986Coalescer / SeparatorVF-609 or VFCS-21 or FBO-10DieselDirt & Free Water695 @ Nom. @ 98% Efficiency75 115 °C, 240 °F1858
OS-61286Coalescer / SeparatorVFCS-22 or FBO-14DieselDirt & Free Water6135 @ Nom. @ 98% Efficiency75 115 °C, 240 °F 


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Product CodeParker_Velcon_OS_Series

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