14
5 FT 70 en
6
INSTALLING AND DETACHING THE
ACTUATOR
6.1
General
Different Metso actuators can be mounted using suitable
brackets and couplings. The valve can be operated, for
example, by actuators of the Quadra-Powr, B1 or E series.
6.2
Installing the Quadra-Powr actuators
6.2.1
General
The Quadra-Powr actuator can be used for ’spring-
to-close’ or ’spring-to-open’ operations, depending
on its installation position. Fig. 20 shows the installa-
tion positions for both options.
6.2.2
Spring to close
The actuator must be free from pressure and the air
supply connection must be open.
Turn the plug closed position. The line at the end of
the stem shows the position.
Clean the stem bore and lubricate it.
Push the actuator carefully onto the valve stem.
Make sure that the installation position is correct.
Avoid forcing it, since this may damage the plug and
seat.
Connect the supply pressure to the actuator.
Increase the pressure slowly until the actuator is per-
pendicular or parallell (depending on the mounting
position) to the flow opening.
Lubricate the actuator mounting screws and fasten
them. Tighten the screws on actuator side first, then
the other ones. See Table 1.
Adjust the valve open and closed limits by means of
the screws on the side of the actuator. Remember to
tighten the locking nuts. See Fig. 20.
Keep your fin-
gers out of the flow bore!
Adjust the closed limit of the actuator to the contact
point using the supply pressures given in Table 5
(applies not to low Cv valves). Select the pressure
according to the flow direction and the operation
mode of the actuator. The pressure relieves the
opening in the ’spring-to-close’ actuators.
6.2.3
Spring to open
Clean the stem bore and lubricate it.
Connect the supply pressure to the actuator. Oper-
ate the actuator until it reaches closed position.
Turn the plug closed position. The line at the end of
the stem shows the position.
Push the actuator carefully onto the valve stem.
Make sure that the installation position is correct.
Avoid forcing it, since this may damage the plug and
seat.
Increase the supply pressure slowly until the actua-
tor is perpendicular or parallell (depending on the
mounting position) to the flow opening.
Lubricate the actuator mounting screws and fasten
them. Tighten the screws on actuator side first, then
the other ones. See Table 1.
Adjust the valve open and closed limits by means of
the screws on the side of the actuator. Remember to
tighten the locking nuts. See Fig. 20.
Keep your fin-
gers out of the flow bore!
Adjust the closed limit of the actuator to the contact
point using the supply pressures given in Table 5
(applies not to low C
v
valves). Select the pressure
according to the flow direction and the operation
mode of the actuator. The pressure relieves the
opening in the ’spring-to-close’ actuators.
CAUTION:
Beware of the plug cutting movement!
NOTE:
Adjust the positioner always after installating the actua-
tor!
Fig.
20
Installation of the Quadra-Powr actuator and
adjustment of the open and closed limits
CAUTION:
Beware of spring forces when using compressed air to
drive the actuator to the correct installation position!
CLOSED limit
OPEN limit
OPEN limit
CLOSED limit
cover
body
SPRING-TO-CLOSE
SPRING-TO-OPEN
Valve behind the actuator
CAUTION:
Beware of spring forces when using compressed air to
drive the actuator to the correct installation position!
NOTE:
If the supply pressure is higher than the values given in
Table 5, the stem of a valve equipped with a ’spring-to-
open’ actuator may be damaged when the valve is closed.
