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Desmi SA Centrifugal Pumps

The Desmi SA self-priming centrifugal pump
Up to 650 m3/h (2900 US gpm)

The diffuser principle in the self-priming Desmi SA centrifugal pump means that the priming capacity is not dependent on valves or other mechanical elements since it is the liquid flow which carries the air.The SA pump used within different applications and markets.

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  • Description
  • Specifications
  • Advantages
  • Applications

Your choice of a Desmi self-priming centrifugal pump holds out the advantages of versatility and sturdiness. Once the pump casing has been filled with water, the pump will be self-priming, i.e. it will automatically remove the air in the suction pipe using the diffuser principle. Another feature is the ability of the pump to carry impurities and solids along with the actual fluid. This is due to the open impeller design including a replaceable wear plate, as distinct from closed impeller design of other centrifugal pumps.

For priming, the pump casing is filled with liquid prior to starting. Due to the rotation of the impeller the liquid is immediately pumped from suction chamber through impeller into air separating chamber.

Due to the negative pressure thus created in the impeller eye, liquid is drawn through the return passage into the impeller. Due to the negative pressure in the pump, the check valve opens so as to draw air from the suction line into the pump where liquid and air are mixed and proceed through the passage into air separating chamber.

Capacity range:

  • 0-650 m3/h

Pressure range:

  • 0-110 mLC

Temperature range:

  • With standard mech. shaft seal max. 80oC, with special mech.
    shaft seal max. 120oC.

Open impeller design

  • Semi-open, non clogging high efficiency impeller
    allowing the pump to operate on dirty water.

Replaceable wear plate

  • To keep the pump at max. capacity even after working with abrasive fluids for a long time, the tolerance between impeller and wear plate may be adjusted by way of shims behind the  replaceable wear plate.

Mechanical shaft seal

  • A reliable, spring-loaded, mechanical shaft seal ensures rapid suction, and shaft wear and stuffing box tightening are avoided.

Check valve mounted at a high level

  • The pump check valve is mounted well above the impeller inlet. Consequently, the pump will not – in case of a check valve leakage – lose the priming water which would result in a loss of priming ability.

Heavy bearing design

  • Heavy shaft and bearing design provide long life even in case of belt drive.
  • Bilge pumps
  • Ballast pumps
  • Fire pumps
  • Cooling water pumps
  • Wash-deck pumps
  • Fuel pumps
  • Wellpoint pumps
  • Irrigation pumps
  • Circulation pumps

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