SISTO-20 Diaphragm valve
Diaphragm valve


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.
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Main Applications

  • Chemical industry
  • Homogenisation
  • Industrial recirculation systems
  • Nuclear power stations
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Technical Data

  • Nominal pressurePN 16
  • Max. nominal sizeDN 200
  • Max. allowed fluid temperature160 °C


  • Reliable sealing to atmosphere and absolutely tight shut-off
  • The diaphragm provides absolutely tight shut-off as well as hermetic sealing to atmosphere and of all operating elements.
  • Maximum service life and pressure limit

Material number list – SISTO-20

35 products
NameNominal pressureNominal size InletWeightMaterial numberPrice
S-16 TWA DN200 PN1695 KilogramM232A142
S-20 1.0619/PFA-TFM 2L DN15 PN16PN 16DN 153 KilogramM233A091
S-20 5.3103/PTFE-TFM 2L DN20 PN16PN 16DN 203.5 KilogramM233A092
S-20 5.3103/PTFE-TFM 2L DN25 PN16PN 16DN 254 KilogramM233A093
S-20 5.3103/PTFE-TFM 2L DN32 PN16PN 16DN 327 KilogramM233A094


TitleFormatSizeLast change
icon download-pdf2-page product description SISTO (8674.021_EN)pdf0.675/24/2019
TitleFormatSizeLast change
icon download-pdfDeclaration of conformity (8630.8507_EN)pdf0.194/23/2020
TitleFormatSizeLast change
icon download-pdfOperating Manual (0570.821_EN)pdf4.056/17/2020

Technical Data

  • FunctionShut off/control flow
  • Connection typeInternal-thread connection, Flange, Butt weld ends, Socket weld ends
  • Design concept DriveWith electric actuator, With handwheel, With pneumatic actuator
  • Casing material1877, 2750
  • Nominal pressurePN 16
  • Max. nominal sizeDN 200
  • Min. nominal sizeDN 15
  • Max. allowed fluid temperature160 °C
  • Min. allowed fluid temperature-20 °C

Sectional Drawings