GEMU Model R690 Industrial Diaphragm Valve


The GEMÜ R690 diaphragm valve has a low maintenance membrane actuator which can be controlled by air or inert gases. Normally Closed (NC), Normally Open (NO) and Double Acting (DA) control functions are available. All medium wetted parts and the actuator housing are made of high-grade plastic materials which can be selected to suit the application.


  • Suitable for inert and corrosive* liquid and gaseous media
  • Insensitive to particulate media
  • Optional flow direction and mounting position
  • Nominal pressure PN 10 / 150 PSI
  • Nominal size DN 15 – DN 100 / NPS 1/2″ – NPS 4″
  • Actuator housing in glass fibre reinforced PP
  • Valve body and diaphragm available in various materials and designs
  • Compact, lightweight construction and high performance
  • Good flow characteristics due to flow optimized valve body
  • Proven long-life membrane actuator
  • Leak detection hole
  • Diaphragm easy to replace
  • Adjusted instrumentation
  • Optical position indicator as standard
  • Optional accessories
    • Electrical position indicator with microswitches or proximity switches
    • Positioner and process controller
    • Stroke limiter
    • Pilot valve


Nominal Sizes: 1/2″3/4″1″1-1/4″1-1/2″2″2-1/2″3″4″

Connection Types: Flanges ANSI CLASS 125/150 RF – length EN 558 series 1Flanges EN 1092 / PN10 / form B – length EN 558 series 1 – ISO 5752 basic series 1Spigots – inch for socket solvent cementing/weldingSpigots DIN for socket solvent cementing/weldingSpigots for IR butt weldingUnion ends with DIN insert (socket)Union ends with inch insert – BS (socket)Union ends with Rp threaded socket inserts

Valve Body Material: ABSInliner PP-H grey / outliner PP reinforced (DN 15 – 50)Inliner PVDF / outliner PP reinforced (DN 15 – 50)PP – reinforced (DN 65 – 100)PVC-U – greyPVDF (DN 65 – 100)

Diaphragm Material: EPDM, FPM, NBRPTFE/EPDM, PTFE laminated