Operation; Control Functions - GEM 550 Installation, Operating, & Maintenance Instructions

Installation - Flange connection:
Install the valve in the condition it is
delivered in:
1. Pay attention to clean, undamaged sealing
surfaces on the mating flanges.
2. Align flanges carefully before installing them.
3. Centre the seals accurately.
4. Use all flange holes.
5. Connect the valve flange and the piping
flange using appropriate sealing material
and matching bolting (sealing material
and bolts are not included in the scope
of the delivery).
Tighten the bolts diagonally!
6. Only use connector elements made of
approved materials!
Observe appropriate regulations for
connections!
After the installation:
Reactivate all safety and protective
G
devices.
11.2

Operation

Optical position indicator
Valve open Valve closed
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11.3

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).
Only for control valves: Control function 8
Double acting (normally open):
Valve resting position: opened by spring
force. The valve is opened and closed
by activating the respective control
medium connectors (connector 2: open /
connector 4: close).
550