All of Corken’s regenerative turbine pumps are known as a Coro-Flo®. The DS-/DSF-model regenerative turbine pump is a direct mount design made for a standard, two pole C-Face motor with a 4.5″ rabett diameter. A 4.5″ rabett diameter fits 56C, 143TC and 145TC motor frames. The direct mount supports both the pump and motor so they can be directly coupled. Since it is designed to exact tolerances of the pump and motor, simple assembly will result in proper alignment of the pump and motor shaft. The advantage of a direct mount is no coupling guard, baseplate, or special alignment procedures are required for installation.

The DS-model comes with NPT connections while the DSF-model has ANSI flange connections. These pumps are designed for liquefied gases such as LPG (propane & butane) agricultural ammonia, natural gas liquids (NGLs), CO2, SO2, refrigerant gases, and many other many more.

Operating Specifications

  • Flow rates up to 50 gpm (189.3 l/min)
  • Working pressures up to 400 psi (28.6)
  • Differential pressures up to 125 psi (8.6 bar)
  • Temperature range: -25 to 225 °F (-32 to 107 °C)
  • Viscosities up to 400 SSU (88 cSt)

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  • Available in six pump models
  • Single-stage pump
  • The direct mount design utilizes a special bracket that accepts a standard two-pole motor with a 4.5″ rabbet diameter
  • Mounting bracket supports both the pump and motor so they can be coupled directly
  • The DS mount is a smaller version of the DL mount and allows you to use smaller horsepower motors
  • DS mount accepts 1 to 2 hp motors
  • Fits 56C, 143TC and 145TC motor frames
  • Mechanically sealed with multiple sealing options
  • Available with NPT or ANSI flange connections
  • Approved by Underwriters’ Laboratories (UL) for LPG and agricultural ammonia service


  • Pump case and cover: Ductile iron
  • Impeller: Bronze, ductile iron or stainless steel
  • Shaft: Steel or stainless steel
  • Seal seat: Cast iron, N-Resist, ceramic or tungsten carbide
  • Seal sleeve and follower: Aluminum or stainless steel
  • Seal rotor: Carbon only
  • Seal metal parts: Steel only
  • Seal housing: Cadmium plated steel or stainless steel
  • O-rings: Buna-N, PTFE, Neoprene®, Viton®, ethylene-propylene or Kalrez®. Registered trademarks of DuPont


  • Ideal for low capacity applications that require medium head
  • Eliminates the need for a coupling, coupling guard and baseplate
  • Free-floating has no metal-to-metal contact and minimizes wear between the pump casing, impeller and cover
  • The balanced mechanical seal and sleeve enhance the sealing performance
  • No vibration or pulsation – delivers years of quiet trouble-free service
  • By simply removing the pump cover, you can easily replace the internals without disturbing the piping
  • Two sets of heavy duty ball bearings provide a long service life
  • Pump nozzles can be rotated into four 90 degree increments
  • Bypass and pressure gauge connections are provided on the outlet nozzle


  • Agricultural ammonia
  • Butane
  • Carbon dioxide
  • Foaming blowing agents
  • Gasoline
  • Light oils
  • Pentane
  • Propane
  • Propylene
  • Refrigerant gases
  • Sulfur dioxide
  • Solvents
  • Many more light liquids
  • Aerosol propellant/filling
  • Liquefied gas transfer
  • Boiler feed (up to 225°F)
  • Vaporizer feed
  • Foam blowing
  • Reflux pump for gas liquids