Control Functions - GEM 620 Series Installation, Operating And Maintenance Instructions

Installation - Flange connection:
1. Pay attention to clean, undamaged sealing
surfaces on the mating fl anges.
2. Align fl anges carefully before installing them.
3. Centre the seals accurately.
4. Connect the valve fl ange and the piping
fl ange using appropriate sealing material
and matching bolting. Sealing material
and bolts are not included in the scope
of delivery.
5. Use all fl ange holes.
6. Only use connector elements made of
approved materials!
7. Tighten the bolts diagonally!
Observe appropriate regulations for
connections!
After the installation:
Reactivate all safety and protective
G
devices.

10.2 Control functions

The following control functions are available:
Control function 1
Normally closed (NC)
Valve resting position: closed by
spring force. Activation of the actuator
(connector 2) opens the valve. When the
actuator is vented, the valve is closed by
spring force.
Control function 2
Normally open (NO)
Valve resting position: opened by
spring force. Activation of the actuator
(connector 4) closes the valve. When the
actuator is vented, the valve is opened by
spring force.
Control function 3
Double acting (DA)
Valve resting position: no defined normal
position. The valve is opened and closed
by activating the respective control
medium connectors (connector 2: open /
connector 4: close).
Control function
1 (NC)
2 (NO)
3 (DA)
+ = available / - = not available
(for connectors 2 / 4 see photos above)
29 / 40
Vent hole
Connector 2
Control function 1
Connector 4
Connector 2
Control function
2 + 3
Connectors
2 4
+ -
- +
+ +
620