Grundfos DMX 221-B Mechanical Diaphragm Dosing Pump

Product Code: N/A

Grundfos DMX 226-B Mechanical Diaphragm Dosing Pump with External Motor

The Grundfos DMX range has proven its worth in dosing applications worldwide. With their robust diaphragm-based design and their high-quality motors, DMX pumps require minimum maintenance and are best choice for many dosing applications. The DMX range is highly versatile: it covers a wide flow range and offers a variety of dosing head sizes, materials and accessories.

The DMX range combines sophisticated drive technology and gear kinematics to ensure smooth and low-pulsation dosing without pressure peaks. This means less stress to all system components, such as tubes and valves, and leads to longer service intervals for the entire system

The diaphragm design makes sure, that the dosing flow fluctuation is ± 1.5 % (DMX 227: ± 2 %) and the linearity deviation is ± 4 % at all times. This allows very precise dosing of chemicals – as much as necessary, as little as possible


Disinfection, coagulation, flocculation, precipitation, etc. in:

  • Drinking water treatment
  • Waste water treatment
  • Pulp and paper industry
  • Textile industry
  • Cleaning water treatment
  • Food and beverage industry, dairies
  • Cooling tower water treatment
  • Low-pressure boiler feed water treatment
  • Agriculture
  • Irrigation
  • Fertigation


  • Accurate dosing
  • Smooth and low-pulsation dosing
  • EPDM Gasket Material
  • Compact design saves money and space
  • Perfect material selection for housing and liquidwetted parts
  • Motors and VFD to match application needs
  • Accessories ensure perfect operation of the entire system
  • Manual stroke length control (10:1 turn down range)
  • 10 – 100% scale knob adjustment
  • Manual operation mode only
  •  Chemical connection thread, G5/8 (5/8″ BSP) with cap and inserts for various tube connections to 50 L/h.
  • G5/4 (1¼” BSP) with 19/27 mm hose connections for 115 L/h
  •  90W 3-phase motor or 1-phase (IP65 rating)

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