Pneumatic diaphragm valve DIASTAR Sixteen

+GF+ strongest one.

Because this type series has the highest closing forces, it is implemented wherever high line pressure, up to 10 bar on both sides, needs to be controlled. The DIASTAR 025 with the integrated accessory interface is also your valve of choice if you place a great deal of importance on easy system integration. Available in the modes of operation: FC, FO and DA.

Fail-safe-to-close (FC mode) 
In the non-operative state, the valve is closed with spring force. When the actuator is pressurised with the control medium (bottom connection), the valve opens. When the control medium escapes, the valve is closed via spring force.

Fail-safe-to-open (FO mode) 
In the non-operative state, the valve is open with spring force. When the actuator is pressurised with the control medium (top connection), the valve closes. When the control medium escapes, the valve is opened via spring force.

Double acting (DA mode) 
The valve has no defined basic position. The valve is opened and closed by applying control pressure to the corresponding connection (top connection for closing, bottom connection for opening).

Range: d20DN15 to d160DN150
Connections: unions, sockets, spigots, flanges, IR-spigots
Standards: ISO, ANSI/ASTM, BS and JIS
Nominal pressure: up to 10 bar both sides
Control medium: compressed air (oil-free)/ inert, non-aggressive gases, max. 40 °C 
Max. control pressure: 6 bar for function FC, 5 bar for function FO and DA
Accessories: limit switch, manual override, stroke limiter, positioner, bus-communication, self-adjusting limit switch, pilot valves, valve cluster with bus-communication, AS-interface

Materials: PVC-U, PVC-C, ABS, PP-H, PROGEF Natural, SYGEF Standard, SYGEF Plus 


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.

Fields of Application:

  • Chemical Process Industry
  • Life Science
  • Microelectronics
  • Water Treatment
  • Food and Beverage
  • Measurement and Control
  • Applications with high viscosity and solid content


  • corrosion resistant and high pressure rating
  • high efficiency due to doubled flow factor, linear valve characteristics
  • linear control characteristic
  • rotatable air connection
  • wide selection of material for best chemical resistance
  • safe and easy maintenance
  • easy integration of a wide range of accessories
  • suitable for slurries and abrasive media


  • self adjusting electrical feedback
  • stroke limiter / manual override
  • pilot valves
  • AS-Interface
  • positioner
  • valve cluster with bus-communication



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