TYPE A – Plunger Dosing Pump



A” type piston metering pumps are suitable for use when the liquid to dose is non abrasive solution and when high pressure is required. The gearbox is a standard wormwheel reduction system coupled with a vertical mounted B14 shaped electric motor in accordance with UNEL-MEC specification.

The mechanism for variation of the stroke length is a positive stroke spring return operated by an eccentric. Stroke adjustment can be done manually, electrically (4-20 mA; Profibus) and pneumatically. Different multiple head units are available on request. All the series can be ATEX certified.


Piston pumps are suitable for use when:

  • The liquid dosed is non-abrasive
  • High pressure is required
  • Flow rates – min 0.8l/h; max 1458l/h
  • Pressure ranges from 4 to 20 bar
  • Available in 220V, 380V & 525V – IP55
  • Standard wet-end executions in PVC or 316 Stainless steel.
  • Pistons in 316 stainless steel or Ceramic
  • Multi-headed pumps also available on request.

Stroke adjustment  can be carried out:

  • Manual: by means of a linear micrometre screw from 0-100%
  • Electrical: by means of a motor servo controller with a 4-20mA signal
  • Pneumatic: by means of a pneumatic servo controller.