Country and language selection

International websites (English) (Deutsch)


Americas / Oceania

Africa and Middle East

Asia / Pacific

SISTO-16TWA Diaphragm valve
Diaphragm valve


Diaphragm valve to DIN/EN with flanged ends, for drinking water installations to DIN 1988, DIN-DVGW-approved for water acc. to test W 270, in compliance with the latest German Environment Agency guideline; shut-off and sealing to atmosphere by completely enclosed and spiral-supported SISTOMaXX diaphragm; position indicator with integrated stem protection. All moving parts are separated from the fluid by the diaphragm. Maintenance-free.
See all documents and downloads

Main Applications

  • Pressure boosting
  • Fire-fighting systems
  • Domestic water supply
  • Air-conditioning systems
Show all applications

Technical Data

  • Nominal pressurePN 16
  • Max. nominal sizeDN 200
  • Max. allowed fluid temperature90 °C


  • Reliable sealing ensured by one single sealing element (the diaphragm), which provides hermetic sealing to atmosphere and absolutely tight shut-off. The specially enclosed diaphragm ensures long service life and high operating reliability.
  • Increased functional reliability of the diaphragm thanks to balanced diaphragm suspension
  • Maintenance-free as all moving parts are separated from the fluid by the diaphragm.


  • S43A_20384585099-1_1

Material number list – SISTO-16TWA

12 products
NameNominal pressureNominal size InletWeightMaterial numberPrice
SISTO-16TWA 1.4409-SISTOMaXX DN10026.1 KilogramM232A059
SISTO-16TWA 1.4409-SISTOMaXX DN12544 KilogramM232A060
SISTO-16TWA 1.4409-SISTOMaXX DN151.9 KilogramM232A051
SISTO-16TWA 1.4409-SISTOMaXX DN15082 KilogramM232A061
SISTO-16TWA 1.4409-SISTOMaXX DN202.6 KilogramM232A052


TitleFormatSizeLast change
Operating Manual (0570.821_EN)PDF4.054/19/2021
TitleFormatSizeLast change
Type series booklet SISTO-16TWA (8635.33_EN)PDF0.654/19/2021

Technical Data

  • FunctionShut off/control flow
  • Connection typeFlange
  • Design concept DriveWith handwheel
  • Casing materialEN-GJL-250, GX2CRNIMO19-11-2
  • Nominal pressurePN 16
  • Max. nominal sizeDN 200
  • Min. nominal sizeDN 15
  • Max. allowed fluid temperature90 °C
  • Min. allowed fluid temperature-10 °C