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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)

GEMU 690 Diaphragm Valve, Plastic

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Actuator Dimensions

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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


 width= 690 Data sheet

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

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