Installing Ec And Ej Actuators - Metso Neles L4 Series Intallation, Maintenance And Operating Instructions

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
If a bushing is required between the actuator shaft
bore and the valve shaft, mount it first in the actua-
tor shaft bore.

The valve keyway is on the side opposite the flat side
of the disc. The actuator shaft bore has two keyways
set 90° apart.

For double-acting cylinder actuator, B1C, and spring-
return cylinder actuator, B1J (spring-to-close),
choose the keyway which establishes the piston in
its upper position (at the top end of the cylinder)
when the valve is closed.
In the spring-return cylinder actuator B1JA (spring-
to-open), choose the keyway which establishes the
piston in its lower position when the valve is open.

Check visually that the actuator is correctly posi-
tioned relative to the valve. Tighten all the fastening
screws as tightly as possible.

Adjust the stop screws to the closed position (see
Section 6.7).

The opening angle in a control valve can be limited
by a stop screw to 80°. The opening angle of a shut-
off valve is 90°.

When a shaft extension is required, the sizing of the
shaft extension must be discussed with the valve
manufacturer.
6.5

Installing EC and EJ actuators

The actuator is attached to a bracket via an ISO 5211 stand-
ard mounting interface. The actuator is adapted to the
valve shaft with a separate bushing. The bushing (II + II) is a
two-piece cone-shaped bushing, which is tightened firmly
with a tightening screw (I) around the valve shaft.

The bushing and the tightening screw are inserted
to actuator drive shaft according to Fig. 22. Cylindri-
cal pins (III) are inserted in the bushing slots, and
these must be directed into the corresponding slots
in the actuator during tightening. Before the installa-
tion of the bushing and the tightening screw, impu-
rities such as old threadlocking material have to be
removed from the threads of the tightening screw,
and Loctite 225 or similar. Threadlock have to be
carefully applied to the threads, as shown in Fig. 22.
The tightening screw can be turned from inside the
actuator shaft using a suitable hex key, Fig. 23.

Prior to installation, the correct keyway position of
the valve has to be checked. The bushing has four
keyways, two of which are intended for valves with
DIN key and two for valve shafts with ANSI key. The
DIN keyway is located in the split between the bush-
ing halves, and the ANSI keyway is located in the
middle of the half bushing. Fig. 24 shows the keyway
position when the actuator is in a closed position.

The open or closed positions of the actuator can be
identified either by using compressed air, see Fig. 25,
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.
Loctite 225 or
similar
Fig. 22. Cone bushing installation
Fig. 23 Tightening of the cone bushing
DIN keyways at bushing
split
ACTUATOR IN CLOSED POSITION
Fig. 24. Keyway positions on the actuator
Stop screw for
closed position
Opening
pressure
Fig. 25. Actuator connections
13
Key
Installation tool
H061904
ANSI keyways in the
middle of bushing
Closing pressure
Stop screw for
open position