Wilo-Sevio ACT

Series description

Your advantages

  • Gentle input of biomass carriers into the fluid
  • Efficient due to increased volume of penetration for an optimised treatment process
  • Reduced energy costs with improved treatment performance
  • Also available with energy-efficient IE3 motor technology
  • Retrofittable in existing systems


Solids diffuser


Gentle process for mixing all kinds of biomass carrier particles in the pumped fluid


The solids diffuser permanently sucks the biomass particles from the surface of the basin and channels them back to the lower layers of the fluid via the pipe. The angled outlet ensures the biomass particles do not drift up or down in an undefined manner, but remain in the fluid for a longer period, thereby supporting the biological process. This circuit ensures the biomass particles are only at the surface of the fluid for a limited time and that they remain active for the treatment process for a considerably longer period.

Scope of delivery

  • Solids diffuser
  • Operating and maintenance manual

Type key


Wilo-Sevio ACT SD 101VT435A


Series for gentle entry of additives into the fluid


Solids diffuser


Pipe diameter in cm



  • V = vertical
  • D = diagonal


Pipe length:

  • T = telescopic
  • F = fixed


max. pipe length incl. outlet elbow in cm


Material version (A = standard in GRP)

Technical data

  • Volume flow rate: 3300…4000 m³/h
  • Max. basin depth: 3…8 m
  • Layer thickness of biomass particles: 1.6…5.5 m
  • Percent by volume of biomass particles: 40…70 %
  • Mains connection: 3~400 V, 50 Hz
  • Submerged operating mode: S1
  • Protection class: IP68
  • Max. fluid temperature: 40 °C


  • Pipe: GRP
  • Propellers: PUR/PUR-HV
  • Motor: EN-GJL-250
  • Screwed connections: Stainless steel 1.4301 or 1.4571


The solids diffuser consists of a pipe with angled outlet, a submersible motor and a propeller.

The pipe is used here for channelling and direct entry of particles into the fluid. The angle of the outlet can be adjusted vertically and horizontally according to the relevant conditions.

The motor is secured centrally in the pipe. A surface-cooled motor with IE0 or IE3 classification (in accordance with IEC 60034-30) is used here. The heat from the motor is transferred directly to the surrounding fluid via the motor housing. The winding is equipped with a temperature monitor. The power cable is a type NSSHÖU cable for heavy mechanical loads. The power cable enters the motor housing through a water pressure-tight cable inlet with strain relief and bend protection. The individual wires as well as the cable sheath are additionally sealed to keep out fluids.

The propeller is driven by the motor and features a specially optimised geometry for safe transport of the particles.


REACH regulation

Edition 2019-10
Page format 209.9 x 296.7 mm
Number of pages 4

PDF (853 kB)


Wilo Submersible Mixers

Page format 209.9 x 297.0 mm
Number of pages 20

PDF (11 MB)


Biological treatment with efficiency.

Page format 209.9 x 297.0 mm
Number of pages 20

PDF (12 MB)


General overview 2019 International version

Article Number 2200591
Edition 2018
Version number 1
Page format 209.9 x 297.0 mm
Number of pages 74

PDF (42 MB)


PDF: Wilo-Sevio ACT


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