Main applications

  • Bio. treatment / 2.stage
  • Biofuels
  • Biogas
  • Boiler feed systems
  • Building services
  • Chemical industry
  • Chemicals and product carriers
  • Cooling water and condensate
  • Crude oil tankers
  • District heating
  • Drainage
  • Drainage pump stations
  • Energy
  • Flue gas desulphurization (FGD)
  • Flue gas desulphurization plants (FGD)
  • Flue gas desulphurization systems (FGD)
  • Food and beverages
  • General Processes
  • Groundwaterlevel (mining/buildings)
  • Heating / ventilation / air-condition
  • Industry engineering
  • Irrigation
  • Lake, Damwater extraction
  • Marine
  • Mech. treatment / 1.stage
  • Municipal waste water
  • Nuclear Power Stations
  • Offshore platforms
  • Oil /Gas
  • Petrochemical Industry
  • Pressure Drainage
  • Refineries
  • Sea -& Riverwater Extraction
  • Sewage treatment plants
  • Shipping / Shipbuilding
  • Special processes
  • Steam and hot water, district heating
  • Steel
  • Sugar
  • Surface treatment
  • Systems
  • Turbine Island
  • Waste water
  • Water
  • Water Extraction
  • Water supply
  • Water treatment
  • Water works
  • Watertransport
  • Watertreatment
  • Well

Technical data

T max 160 °C
DN max 200
PN max 16


Diaphragm valve to DIN/EN with flanged ends; shut-off and sealing to atmosphere by completely enclosed spiral-supported diaphragm; body with or without lining, position indicator with integrated stem protection. All moving parts are separated from the fluid by the diaphragm. Maintenance-free.


In building services, industrial plants and power stations; suitable for drinking water, service water, air, oil, technical gases; from fluids handled in the food and beverages industry to abrasive and aggressive products in chemical and process engineering.

Further technical information about SISTO-20

Overview of technical data

T -20 – 160 (°C)
DN 15 – 200
PN 16
Actuator options available ex works Electric actuator type MAT-E, Pneumatic actuator type MAT-P/PC
Body design Straight pattern body
Bonnet design Bonnet
Coating Yes
No dead volume" design Yes
Handwheel movememt Rising
Lining Yes
Valve disc/plug material Soft seat
Threaded-end design Flange design
Body material (EN standard) JS 1025, 1.4408
Main applications Building services, Water, Shipping / Shipbuilding, Energy, Industry and process engineering, Oil / Gas, Mining / Dredge, Waste water / sewage
Body material Nodular cast iron, Cast stainless steel
Body/bonnet seal element Supported and enclosed diaphragm