Piston diaphragm pumps of type RF409.2-KM

Flow rate from 7,5 l/h to 190 l/h, counter pressures up to 80 bar

sera piston diaphragm pumps RF409.2-KM are leak-free oscillating displacement pumps designed for the dosing of volumes. They are an ideal combination of the high supply pressure of a piston pump and the perfect leak-proof diaphragm pump.

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Product information Series 4 Piston Diaphragm Pumps

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Performance characteristics

  • Leakage free
  • Highest dosing accuracy
  • Dry run safety
  • High quality materials
  • Continuous operation with minimum maintenance
  • Long operating life
  • Easy to operate
  • Integrated safety device against overpressure

Field of application

Flow free mediums with the following characteristics:

  • aggressive
  • abrasive
  • viscous
  • radioactive
  • flammable
  • odorous
  • toxic


Design and function

The stroke movement of the mechanically-driven piston is transferred hydraulically to the multi-layer diaphragm. An integrated compensating valve guarantees an extraordinary dosing accuracy and offers optimum overload protection: in case of an impermissible high counterpressure the hydraulic fluid can pass off into the compensating valve.

Multi-layer diaphragm technology

By using the multi-layer diaphragm these pumps can now handle dosing tasks with higher requirements regarding safety because the diaphragm rupture signalisation (pressure switch, manometer etc.) fulfils such demands.
Furthermore the lifetime of these diaphragms is much higher than the lifetime of single layer diaphragms.


Materials and options

A suitable material is available for each dosing medium!

  • Pump body and valve: PVC, PP, PVDF, 1.4571, Titanium, Hastelloy, PP-FRP, PVDF-FRP
  • Valve balls: PTFE, 1.4401, Hastelloy
  • Valve seals: EPDM, FPM, FEP-covered
  • Working diaphragm: PTFE (3-ply)

Please ask us for any material required but not mentioned here

Available designs

Type Q (at 50 Hz) p/max.
RF409.2-7,5KM up to 7,5 l/h 80 bar
RF409.2-10KM up to 10 l/h 80 bar
RF409.2-18KM up to 18 l/h 70 bar
RF409.2-45KM up to 45 l/h 35 bar
RF409.2-95KM up to 95 l/h 20 bar
RF409.2-190KM up to 190 l/h 10 bar