Multistage centrifugal electric pumps

Extremely noiseless and reliable the multistage centrifugal electric pumps series STO have been designed to pump from basins or storage tanks, clean liquids, non-explosive or aggressive for the pump’s materials, without abrasives and suspended solids.

  • Liquid temperature not higher than 35 °C for domestic use (CEI EN 60335-2-41) or 90 °C for other use, while the ambient temperature must not be higher than 40 °C
  • Flow rate up to ~ 10 m3/h
  • Heads up to ~ 74 m


  • Suction flange : Cast iron G20 with anti-corrosive coating
  • Outlet bracket : Cast iron G20 with anti-corrosive coating
  • Cover : Stainless steel AISI 304
  • Diffusers : Techno-polymer
  • Impellers : Stainless steel AISI 304
  • Pump shaft : Stainless steel AISI 304
  • Mechanical seal : Carbon – Ceramics


The control motors are asynchronous, squirrel cage-type, closed, with external ventilation

  • Incorporated motor protection and capacitor always on, for single-phase models
  • The motor protection for three-phase models must be installed by the customer. Equipment compliant with current standards should be used
  • Class of insulation:F-service:S1-Degree of protection: IP 44
  • Terminal board protection: IP 54