Oscillating piston pumps

GREENPUMPS GPHV Alloy Oscillating Piston Positive Displacement pumps are designed and fabricated for constant flow and high head self regulating applications.

All GREENPUMPS, due to the construction features are thought to have zero leakages even in extreme working conditions.

Absence of mechanical seal or packing gland eliminates dangerous emission to protect the environment and workers.


Self-Priming The pumps prime automatically in heavy conditions with remarkable suction lift. The suction pipe vacuum is 0.7-0.8 Bar.

Reversible Flow The pumps can run in either direction with identical performance, this can be obtained with a simple operation.

Low Maintenance The spring mechanism allows the pumps to operate over a wide viscosity range, to handle solid particles in suspension and to adjust working clearances automatically for wear or thermal dilatation.

Low Speed A low rotating speed allows the pump to handle highly viscous liquids and delicate shear sensitive liquids. It also guarantees reliability and a long service life.

  • Head up to 5 bar (72 PSI)
  • Flow from 1 to 30 m3/h (from 3,6 to 110 GPM) both at 50 Hz and at 60Hz
  • Dry Self-priming up to 7m (23 feet) of water
  • Temperature range from -20°C (-4°F) to 120°C (248°F)
  • Specific gravity up to 2 Kg/dm3
  • Viscosity up to 2000 cSt
  • System pressure rating 16 bar (232 PSI).


  • Dry Self-priming without damages
  • Low maintenance costs
  • High MTBF (mean time between failure)
  • High torque magnets
  • Pumps are also available in compliance with  ATEX regulation category EX II 2 G