Metso L12 Series, Installation Maintenance And Operating Instructions

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12 2 L12 71 en

The open or closed positions of the actuator can be
identified either by using compressed air, see Fig. 23,
or by checking the position of the pointer at the end
of the drive shaft. The actuator is closed if the direc-
tion of the slot in the coupling plate is transverse to
the direction of the actuator's main line.

Mount the actuator to the valve bracket with four
screws. The tightening screw of the bushing should
be loosened before mounting, to allow the shaft to
fit easily into the actuator.

The actuator construction allows axial movement of
the drive shaft to compensate the valve shaft move-
ment due to e.g. thermal expansion. Check, before
the screw is tightened, that the drive shaft is in the
upper position of its axial movement, which is its
normal position (the mounting position shown in
Fig. 21). Checking is important, as the actuator shaft
drops down slightly when the screw is tightened.
The drive shaft axial movement can be observed and
measured before attachment to a valve. The actuator
drive shaft is in the upper position when its upper
surface conforms to Table 9 (see Fig. 21).

The drive shaft will automatically find its correct posi-
tion if the installation tool H061904 (see Fig. 21) is
used. The installation tool is attached instead of the
coupling plate using M4 screws with the drive shaft in
lower position (before the valve is installed). Tighten
the nut of the tool in such a way that the tool pulls the
drive shaft to the uppermost position. The position
may be checked from the side of the tool.

Install the actuator on the valve and attach the valve
mounting screws loosely by hand. Then tighten the
tightening screw (I) according to Table 9. The
required torque is also marked on a plate close to the
drive shaft on the actuator housing. The installation
tool is removed, and the coupling plate is reat-
tached. Finally, tighten the valve mounting screws.

Check the axial position of the drive shaft. The shaft
position may not be at the upper or lower position X
given in Table 9, or close to those values. Remount
the actuator if the position is not correct.
The valve may malfunction if the tightening of
the connection has been carried out improperly.

Finally, the extreme rotation positions of the valve
are adjusted with the adjustment screws at the ends
of the actuator. The location of the screws for adjust-
ing the close and open positions of the valve are
marked on the actuator housing (see Fig. 22). See
Section 6.5.
Fig. 20. Cone bushing installation
Fig. 21 Tightening of the cone bushing
Fig. 22. Keyway positions on the actuator
Loctite 225 or
similar
Key
X
Installation tool
H061904
DIN keyways at bushing
split
ANSI keyways in the
middle of bushing
ACTUATOR IN CLOSED POSITION
Fig. 23. Actuator connections
Table 9 Mounting faces, tightening screws and drive
shaft clearances
Size Mounting Thread Key Nm
~X
upper pos.
(mm)
~X
lower pos.
(mm)
EC/EJ05 F05 M12 6 25 4.0 1
EC/EJ07 F07 M16 8 50 1.5 -2
EC/EJ10 F10 M20 10 100 2.5 -2
EC/EJ12 F12 M24 14 200 3.5 -2
EC/EJ14 F14 M36 19 700 4.5 -2
Closing pressure
Stop screw for
open position
Stop screw for
closed position
Opening
pressure