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All Categories > Industrial Diaphragm Valves > Plastic Diaphragm Valves > GEMU 690 Diaphragm Valve, Plastic  

GEMU 690 Diaphragm Valve, Plastic

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The GEMU 690 2/2 way valve has a low maintenance membrane actuator which can be controlled by inert gases.
Normally Closed, Normally Open and Double Acting control functions are available.
All medium wetted parts and the actuator housing are made of plastic.

  • 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
  • Body and diaphragm sizes have coordinated diameters hence the fitting time is reduced because the pipe and fixing centres remain the same. Spares inventory is also reduced.
  • Optional accessories
    • Electrical position indicator
    • Electrical position indicator with microswitches or proximity switches
    • Mounting bracket according to NAMUR
    • Pneumatic or electro-pneumatic positioner
    • Stroke limiter (DN 65-100: observe marking on actuator cover)

Specifications  · Working Medium




Nominal Size

DN 100
DN 15

DN 20

DN 25

DN 32

DN 40

DN 50

DN 65

DN 80

Body Configuration

Straight through


Flanges ANSI class 125/150 RF length EN 558-2, series 1 ISO 5752, basic series 1 (ex DIN 3202-1, series F1)
Flanges EN 1092/PN10/form B (ex DIN 2501/PN10/form C) length EN 558-1, series 1 ISO 5752, basic series 1 (ex DIN 3202-1, series F1)

Spigots - inch

Spigots DIN for socket welding

Spigots for IR butt welding

Spigots for IR butt welding, BCF

Union ends with DIN insert (IR butt welding)

Union ends with DIN insert (socket)

Union ends with inch insert (socket)

Valve Body Material

Lining PP-H RAL 7032, coloured/Outliner PP reinforced

Lining PP-H, natural/Outliner PP reinforced




Control Function

Double acting
Normally closed

Normally open

Ambient Temperature

Valve body ABS / PVDF: (-20 to 60°C)
Valve body PVC-U / PP: (5 to 60°C)

Control Medium

Max. perm, temperature of control medium: 40°C

Filling Volume

DN 15-25: 0.15 Nl
DN 32-40: 0.35 Nl

DN 50: 1.10 Nl

DN 65-100: 2.50 Nl

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 Medium1

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 The permissible operating pressure depends on the working medium temperature.


·  Control Pressure Characteristic


Stroke Limiters, Seal Adjusters, Optical Position Indicators, and Manual Overrides

 Accessories 600, 687, 690, 695 

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