5 FT 70 en
15
6.3
Installing the B1C series actuators
Turn the valve to the closed position and drive actu-
ator piston to the extreme outward position.
Clean the stem bore.
Place a coupling over the stem, when applicable.
Note the correct position. The line at the end of the
stem indicates the direction of the flow bore.
Lubricate the stem and stem bore. Fasten the
bracket loosely to the valve.
Slip the actuator carefully onto the stem. Avoid forc-
ing it since this may damage the plug and seats. We
recommend mounting the actuator so that the cylin-
der is pointing upwards.
Position the actuator parallel or vertical to the pipeline
as accurately as possible. Lubricate the actuator mount-
ing screws and then fasten all screws.
Adjust the plug open and closed positions by means
of the actuator stop screws located at both ends, Fig.
22. An accurate open position can be seen in the
body flow bore. Check that the yellow arrow on the
actuator indicates the plug flow opening position.
Keep fingers out of the flow bore!
Adjust the closed limit of the actuator to the contact
point using the supply pressures given in Table 6
(applies not to low C
v
valves).
Check the stop screw thread tightness. The threads
must be sealed using an appropriate non-hardening
sealant, e.g Loctite 225.
Check that the actuator is functioning correctly.
Drive the actuator piston to both cylinder ends and
check the plug position and its movement with
respect to the actuator (close: clockwise; open: coun-
terclockwise). The valve should be closed when the
piston is in the extreme outward position.
If necessary, change the position of the actuator
pointing cover to correctly indicate the valve open/
closed position.
Table 5
Supply pressures for adjusting the closed limit,
Quadra-Powr actuators
Valve size
Actuator
Spring
Supply pressure, bar
Spring-to-
close
Spring-to-
open
DN25
QP 1
C
0.8
3.4
2
B
0.8
2.3
2
C
1.3
3.2
DN40
1
C
0.7
3.4
2
B
0.7
2.3
2
C
1.2
3.2
DN50
2
B
0.5
2.6
2
C
1.0
3.5
2
D
1.4
4.0
3
B
0.8
2.3
3
C
1.3
3.1
3
D
1.7
3.9
DN80
3
C
1.0
3.5
3
D
1.4
4.2
4
B
0.8
2.2
4
C
1.3
3.1
4
D
1.9
3.7
DN100
4
C
0.8
3.5
4
D
1.3
4.2
5
B
0.7
2.3
5
C
1.2
3.1
5
D
1.8
3.8
DN150
5
B
0.6
2.4
5
C
1.1
3.2
5
D
1.7
3.9
Note: This table is not applicable to low Cv valves
CAUTION:
Beware of plug cutting movement!
Fig. 21
Bracket mounted on valve.
stem
bracket with
ISO 5211
mounting face
Fig. 22
Adjusting the open and closed position
stop screw for
CLOSED position
stop screw for
OPEN position
