Connecting The Control Medium; Assembly / Disassembly Of Spare Parts; Disassembly Of Actuator; Replacement Of Seals - GEM 554 Installation, Operating, & Maintenance Instructions

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).
Connector 4
Connector 2
Control function
1 (NC)
2 (NO)
3 (DA)
8 (normally open)
+ = available / - = not available
(for connectors 2 / 4 see picture above)
11.3 Connecting the control
medium
Important:
Connect the control medium
lines tension-free and without any
bends or knots! Use appropriate
connectors according to the
application.
Thread size of the control medium connectors
2 and 4:
Actuator size
B
0, 0K, 1, 1K, 2, 2K, 3, 3L, 4, 4L
554
12
See also chapter 11.1 "Installing the valve"
and chapter 20 "Sectional drawing and
spare parts".
Pictures for assembly of actuator B see
chapter 14 "Inspection and servicing".
12.1
1. Move actuator A to the open position.
2. Actuator size B:
Connectors
2 4
+ -
- +
3. Remove actuator A from valve body 1.
+ +
4. Disconnect actuator A from control
+ +
12.2
Thread
G 1/8
G 1/4
34 / 44
Control function
1 Normally closed (NC)
2 Normally open (NO)
3 Double acting (DA)
Double acting
8
(normally open)
For connectors 2 / 4 see picture on the left
Assembly / disassembly
of spare parts

Disassembly of actuator

Loosen actuator with a pin wrench
(pin size 3 mm).
Actuator sizes 0, 0K, 1, 1K, 2, 2K, 3, 3L,
4, 4L: Loosen union nut a.
medium lines.
Important:
After disassembly, clean all parts
of contamination (do not damage
parts). Check parts for potential
damage, replace if necessary (only
use genuine parts from GEMÜ).

Replacement of seals

Replacement of seat seal: not for
actuator size B.
Important:
Replace gasket 4 during every
actuator disassembly / assembly.
Connectors
2: Control medium (open)
4: Control medium (close)
2: Control medium (open)
4: Control medium (close)
2: Control medium (open)
4: Control medium (close)