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Construction
The motorized GEMU 428 2/2 way butterfly valve has a low maintenance electrical actuator with a powerful reversible DC motor. The secondary gear in the motor, consisting of a threaded spindle with swivel lever, provides the rotation through 90°. GEMU 428 has an optical position indicator and a manual override.

Features
  • Suitable for inert, corrosive, liquid and gaseous media
  • Insensitive to media with high viscosities
  • Quick on/off operation
  • Electrical position indication by 2 potential-free, adjustable limit switches
  • Opening and closing behaviour is independent of the operating pressure
Advantages
  • Adjustable end positions by means of micro-switches
  • Emergency power supply with 24V DC types through the emergency power supply module type 1570
  • Various seal materials are available to suit the medium
  • Low maintenance

Specifications

Type 428
Nominal Size 15 mm20 mm25 mm32 mm40 mm50 mm
Body Configuration Straight through
Connection Butt Weld Spigots ASME BPE Threaded Sockets DIN ISO 228
Valve Body Material Brass (Butterfly disc brass), MS St. steel investment casting (Butterfly disc st. steel), 1.4581
Seal Material EPDM FPM Silicon Rubber, PSI
Supply Voltages/Frequency 12 V DC 24 V DC 12 V 50/60 Hz 24 V 50/60 Hz 100-250 V 50/60 Hz
Torque Torque 6 Nm, operating time 4 sec; Spur gear; DN 15-25 Torque 15 Nm, operating time 11 sec; Planetary gear; DN 15-50 Torque 6 Nm, operating time 4 sec; Spur gear; DN 15-25 Torque 15 Nm, operating time 11 sec; Planetary gear; DN 15-50
Special Design
K-No. 6410 - Parallel operation K-No. 6597 - With additional potential-free limit switches and connection with 2 Hirschmann sockets DIN 43651 Type N6RFFS11 K-No. 6598 - Connection with 1 Hirschmann socket DIN 43651 Type N6RFFS11 K-No. 6722 - With additional potential-free limit switches and connection with 2 Harting plugs Type HAN 7D K-No. 6812 - Mains and signal galvanically separated, connection with 2 Hirschmann sockets DIN 43651 Type N6RFFS11
Functional Module1 OPEN/CLOSED control with 2 additional potential-free limit switches&PN=AE
Ambient Temperature -10 to +60 ºC
Storage Temperature -20 to +60 ºC
Protection Class to EN 60529 IP 65
Manual Override with Allen key SW3
Note Special designs are available upon request

Working Medium

Working Medium Corrosive, inert, gaseous and liquid media which have no negative impact on the physical and chemical properties of the body, disc and seal material.
Max. Working Pressure 10 bar
Max. Medium Temperature 100 ºC

Turn Range

Nominal Turn Range 90 º
Max. Turn Range 93 º
Min. Setting Range Limit Switch -2 to 12 º
Max. Setting Range Limit Switch 76 to 91 º
  • 1 Overall height 2