The GEMU 667 pneumatically operated 2/2 way diaphragm valve has a low maintenance membrane actuator. All medium wetted parts and the housing are made of plastic.
Valve sizes DN 15 to DN 50 are self-opening due to integral springs (Control function 2), valve sizes DN 65 and DN 80 are opened by the pressure of the working medium on the diaphragm (Control function 5).

  • Suitable for inert and corrosive liquid and gaseous media
  • Valve body and diaphragm available in various materials and designs
  • Insensitive to particulate media
  • Various connections available

  • Optional flow direction, will seal in either flow direction up to full working pressure
  • Optional mounting position
  • Optional accessories
    • Stroke limiter with optical position indicator
    • Electrical position indicator (GEMU 1215), "Closed" position
    • Electrical position indicators with microswitches or proximity switches


Type 667
Nominal Size DN 15 DN 20 DN 25 DN 32 DN 40 DN 50 DN 65 DN 80
Body Configuration 2/2-Way
Connection1 Spigots - DIN, for socket welding Spigots - inch Spigots for IR butt welding Spigots for IR butt welding, BCF Union ends with DIN insert (for IR butt welding) Union ends with DIN insert (socket) Union ends with inch insert (socket)
Valve Body Material ABS In-liner PPH - grey ace. to RAL 7032 In-liner PPH - natural PP PVC-U PVDF
Diaphragm Material CSM EPDM FPM NBR
Control Function Closed by control medium, opened by spring tension (DN 15-50) Closed by control medium, opened by working medium (DN 65+80)
Ambient Temperature Valve body ABS / PVDF: -20 to 60°C Valve body PVC-U / PP: 5 to 60°C

Working Medium

Working Medium Corrosive, inert, gaseous and liquid media which have no negative impact on the physical and chemical properties of the body and diaphragm materials.
Temperature of Working Medium2 Valve body ABS: -20 to 60°C Valve body PP: 5 to 80°C Valve body PVC-U: 5 to 60°C Valve body PVDF: -20 to 80°C
  • 1 Due to the low overall actuator height, flange connections not feasible. If flanges are required, we recommend GEMU 690 control function 2.
  • 2 The permissible operating pressure depends on the working medium temperature.