Installation Of The Atex Version; Pneumatic Connection; Control Functions - GEM R481 Victoria Operating Instructions Manual

11 Pneumatic connection

5 4
13. Slightly tighten the bolts 4 and nuts 5 diagonally.
14. Fully open the disc and check the alignment of the piping.
15. Tighten the nuts 5 diagonally until the flanges fit tightly on
the body.
Observe the permissible tightening torque of the bolts
(see "Mechanical data").

10.4 Installation of the ATEX version

1. Install the butterfly valve, see chapter "Installation of the
standard version".
2. Connect the earthing cable of the butterfly valve to the
earth terminal of the plant.
3. Test the resistance between the earthing cable and actu-
ator shaft (value <106 Ω, typical value <5 Ω).
GEMÜ R481 Victoria
11 Pneumatic connection

11.1 Control functions

The following control functions are available:
Control function 1
Normally closed (NC)
Butterfly valve resting position: closed by spring force. Activa-
tion of the actuator (connector 2) opens the butterfly valve.
When the actuator is vented, the butterfly valve is closed by
spring force.
Control function 2
Normally open (NO)
Butterfly valve resting position: opened by spring force. Activ-
ation of the actuator (connector 4) closes the butterfly valve.
When the actuator is vented, the butterfly valve is opened by
spring force.
Control function 3
Double acting (DA)
Butterfly valve resting position: undefined. The butterfly valve
is opened and closed by activating the respective control me-
dium connectors (connector 2: open / connector 4: close).
Control function
1 (NC)
2 (NO)
3 (DA)
+ = available / - = not available
(for connectors 2 / 4 see picture in chapter Connecting the
68 / 84
Connectors
2
+ -
- +
+ +
control medium)
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