Main applications

  • Advanced treatment / 3.stage
  • 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.


Building services, industry and power stations; suitable for drinking water, service water, air, oil, technical gases, fluids handled in the food and beverage industry, abrasive and aggressive products in chemical engineering 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) 1.4409, JS 1025
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