Iris®diaphragm control valve

Iris®diaphragm control valve Please click on the product picture for starting the video!
Energy saving valve for the precise and economical control at low loss of pressure of liquids and gases that can be either clean or contain particles.


  • Air for aeration in wastewater treatment plant
  • Gases
  • Municipal and industrial wastewater
  • Slurries and viscous materials
  • Paper pulp and fibrous suspensions
  • Pellets with a particle size over 0,5 mm
  • Sugar suspensions
  • Drinking water


  • Highly precise control of the flow rate through concentric Iris® diaphragms (similar to a camera diaphragm).
  • Energy-saving and low-noise control valve due to its free centric passage.
  • Maintenance free

Facts & Figures

Nominal dimensions: DN 25 - 400 mm
  1 - 16"
Pressure: up to 10 bar / 150 psi
Temperature: up to 220 °C / 428 °F
Materials: Casing: GG, 1.4409, 1.4588
  Segments: Bz hard chrome-plated, 1.4404, 1.4529
  Special materials on request


  • Energy-saving flow control
  • No hysteresis
  • Robust construction, suitable for frequent start-stop
  • Low pressure losses due to larger open channel
  • High flow capacity Cv (Kv)
  • Turbulence-free across the entire range of flow regulation

Operations and drives

Manual operation

Electric operation

Pneumatic operation

Iris® diaphragm control valve
additional information
Aeration air flow control on WWTP Jena
Aeration air flow control on WWTP Chemnitz
Aeration air flow control at the Erdinger Moos Sewage Association