Fluid handling, regulation and control

Fluid handling, regulation and control

Fluid handling, regulation and control

GEMÜ 667 2/2-way plastic diaphragm valve


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).


  • DN: 15, 20, 25, 32, 40, 50, 65, 80
  • Body Configuration: 2/2-way
  • Connection: 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: Corrosive, inert, gaseous and liquid media which have no negative impact on the physical and chemical properties of the body and diaphragm materials.


  • 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

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