GEMU 648 Diaphragm Valve

Code: GEMU 648
  • Easy Installation
  • Motorised
  • Diagnostic Capabilities

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The GEMU 648 2/2-way diaphragm valve has a motorized linear actuator. The motor has a plastic housing and is designed for DC and AC operating voltages. The integrated gear translates the rotary motor movement into a linear movement. The actuator is available as an on/off version or with an integrated positioner and additional process controller. The membrane keypad and the backlit display are at the front of the unit and easily accessible. The integrated electronic system enables easy setting of actuating speed, control parameters and other functions.


  • Suitable for inert and corrosive liquid and gaseous media
  • OPEN/CLOSE function or CONTROL version
  • Actuating speed and control parameters easily adjustable
  • Optimized initialisation and valve control
  • Parameterisation during operation
  • Torque limitation
  • Electronic limitation of opening and closing stroke
  • Positioner and process controller are synchronized with each other
  • Optional integrated emergency power supply module with selectable safety position
  • Setting of functions via display


  • Can be combined with virtually all GEMU diaphragm valve bodies
  • 2-colour LEDs with good visibility for indication of end position and travel direction
  • Extensive integrated diagnostic functions
  • Simple commissioning and versatile operating facilities- Membrane keypad at the front of the unit- PC connection with Internet browser- Fieldbus interfaces, e.g. Profibus DP- interface for connecting a Bluetooth module or industrial modem

Technical details

  • Connection: Spigot
  • Actuator: Motorized
  • Body material: 1.4408, PFA lined; 1.4408, investment casting; 1.4435, forged body; 1.4435, investment casting; ABS; EN-GJL-250; EN-GJS-400-18-LT (GGG 40.3), PFA lined; EN-GJS-400-18-LT (GGG 40.3), PP lined; EN-GJS-400-18-LT, hard rubber lined; EN-GJS-500-7, PFA lined; EN-GJS-500-7, PP lined; PP; PP inliner / outliner; PVC; PVDF
  • Conformities: ; FDA; TA Luft (German Clean Air Act)
  • Max. operating pressure: 10 bar
  • Max. media temperature: 150 ° C
  • Nominal sizes: DN 15 (1/2”); DN 20 (3/4”); DN 25 (1”); DN 32 (1 1/4”); DN 40 (1 1/2”); DN 50 (2”); DN 65 (2 1/2”); DN 80 (3”); DN 100 (4”)
  • Control valve

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Title Size
648 Datasheet 505 KB

Additional information

Weight 0.09 kg