Control Functions - GEM 536 Installation, Operating And Maintenance Instruction

5. .Completely drain the plant (or plant
component) and let it cool down until
the temperature is below the media
vaporization temperature and scalding
can be ruled out.
6. Correctly decontaminate, rinse and ventilate
the plant or plant component.
Flange connection:
Install the valve in the condition it is
delivered in:
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. Use all fl ange holes.
5. 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).
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

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.
536
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
Connector 2
Control
function 2+ 3
Connector 4
Connector 2
Control function
1 (NC)
2 (NO)
3 (DA)
+ = available / - = not available
(for connectors 2 / 4 see pictures above)
24 / 32
Connectors
2 4
+ -
- +
+ +