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4.2
Cleaning or replacing the plug
1. Unscrew the coupling nut and remove the
actuator from the valve.
2. Unscrew the control line (7).
3. Unscrew the screws (6.2). Remove the
bottom diaphragm case together with the
operating diaphragm (6.1) and dia-
phragm plate.
4. For valve sizes DN 15 to 25, unscrew
the guide nipple of the plug assembly (3)
using a socket wrench (order no.
1280-3001) or a self-made wrench
made from a Gedore screwdriver bit (IN
19-19), for example, by drilling a 17
mm hole with a 17 mm diameter into the
19 mm hexagon bit (Fig. 4). Then pull
out the guide nipple.
For valve sizes DN 32 to 50, unscrew
the stopper first. Then pull out the plug
assembly.
5. Thoroughly clean the seat and plug.
Check the control line and screw fitting
for any blockages. Should the plug be
damaged, replace the entire plug assem-
bly with a new one.
6. To reassemble, proceed in reverse order.
Observe the tightening torques specified
in the table in Fig. 2.
Fig. 4 · Socket wrench
17
SW 19
4.3
Replacing the diaphragm
1. Unscrew the coupling nut and remove the
actuator from the valve.
2. Unscrew the control line (7).
3. Unscrew the screws (6.2). Remove the
bottom diaphragm case together with the
operating diaphragm (6.1) and dia-
phragm plate.
4. Replace the diaphragm together with the
diaphragm plates with new ones.
5. To reassemble, proceed in reverse order.
Observe the tightening torques specified
in the table in Fig. 2. Prior to reattaching
the actuator, make sure that the dia-
phragm has been inserted properly in the
ring groove.
5
Nameplate
1
3
1
Configuration ID
2
Type designation
3
Model number
4
Date of manufacture
In the other fields:
K
or C
VS
V
Upper differential pressure in bar or psi
Flow set point range in m³/h
Max. perm. temperature in °C or °F
Max. perm. differential pressure Δp
Nominal pressure PN or ANSI Class
Fig. 5 · Labeling
Nameplate
2
4
9
EB 3135-1 EN
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