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PROGEF Natural
Diaphragm valve DIASTAR Six
FC (Fail safe to close)
With butt fusion spigots SDR11 metric

The new pneumatic Diaphragm Valves of GF Piping Systems represent a revolution in terms of safety, efficiency and simplicity.

Like the hand valves the new DIASTAR also has a central union nut. This connection is non-corrosive, temperature stable and high pressure rating up to 16 bar.

Because of the doubled flow rate the energy expenditure can be reduced considerably. At the same time the flow characteristic is very linear and thus ideally suited for control applications.

Features like rotatable air connections and pre-tensioned spring-kits facilitate installation and maintenance enormously. The accessory interface allows simple integration into facility automation.

  • Material: PP-R unpigmented
  • Double flow rate compared to predecessor
  • One housing nut replaces four screws
  • Rotating air connection at 90° intervals
  • Individual configuration of the valve

Technical Details

kv-value (Δp=1 bar)
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25206271MeasurementsCAD 168615113
32256481MeasurementsCAD 168615114
40326759MeasurementsCAD 168615115
50406960MeasurementsCAD 168615116
635061181MeasurementsCAD 168615117


  • easy integration of a wide range of accessories
  • rotatable air connection
  • safe and easy maintenance
  • high efficiency due to doubled flow factor, linear valve characteristics
  • Corrosion resistant materials; PP or PVDF with SS, Hastelloy-C, or Titanium
  • wide selection of material for best chemical resistance
  • linear control characteristic
  • suitable for slurries and abrasive media

Fields of Application:
  • Microelectronics
  • Chemical Process Industry

  • Food and Beverage
  • Life science
  • Applications with high viscosity and solid content
  • Measurement and control
  • water treatment

  • Stroke limiter / manual override

  • AS-Interface
  • self adjusting electrical feedback
  • Positioner

  • Pilot valves

  • Valve cluster with bus-communication


Diaphragm valves - A class of their own.pdfPDF2.76 MBDownload
Mounting methods for the new generation of diaphragm valves.pdfPDF348.81 KBDownload
Innovation by revolution - The new generation of diaphragm valves.pdfPDF488.96 KBDownload
Tips and Tricks - Diaphragm valves.pdfPDF3.41 MBDownload

Promoflyer - SAFETY WITH NO COMPROMISE.pdfPDF1.45 MBDownload

Instruction Manual
Pneumatic Diaphragm Valve DIASTAR.pdfPDF2.02 MBDownload

Product Catalog
Product Range - The new generation of diaphragm valves.pdfPDF3.07 MBDownload
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