Metso VD Series, Installation, Maintenance And Operation Instructions

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14 6 DA 70 en

Loose and remove the short hexagon screws (23, 24,
diaphragm case bolts) and the hexagon nuts (25).

Loose and remove the the long hexagon screws (24,
tension bolts) and the hexagon nuts (25). in cross
steps to release spring tension gradually.

Remove the upper case (20).

Loose the stem nut (33) and remove the lock washer
(33a).

Remove the stem rod plate (16) with inserted o-ring
(17) from top stem (18).

Remove the diaphragm (6) and diaphragm plate (13)
and stopper (15) from the top stem (18).

Remove the spring seats (11) and springs (12).

Mount the stem rod plate (16) with inserted o-ring
(17) on the top stem (18).

Mount the the diaphragm (6) and diaphragm plate
(13).

Mount the the stopper (15) on the top stem (18).

Mount the lock washer (33a) and stem nut (33) and
tighten.

Mount the spring seats (11) and springs (12).

Mount the upper case (20).

Replace and tighten the long hexagon screws (24,
tension bolts) and hexagon nuts (25) in equal steps
until the cases meet.

Replace and tighten the remaining the short hexa-
gon screws and nuts.

Mount the vent cap (34) on the upper case (20) for
prevent go water, dirty particles into the actuator.

To connect the related instrument fitting and tub-
ings on the bottom side of lower case (10).
4.7.2 Change of the actuator action: VDR, Air
to open --> VDD, Air to close

See Fig. 5 and Exploded view.

We recommend that all seals be replaced when the
actuator has been dismantled for servicing.

The actuator must be depressurized and the supply
air pipes disconnected.

Detach the actuator.

Check that the actuator has been depressurized, and
remove air tubing from the lower case (10).

Loose and remove the short hexagon screws (23, 24,
diaphragm case bolts) and the hexagon nuts (25).

Loose and remove the the long hexagon screws (24,
tension bolts) and the hexagon nuts (25). in cross
steps to release spring tension gradually.

Remove the upper case (20).

Remove the spring seats (11) and springs (12).

Loose the stem nut (33) and remove the lock washer
(33a).

Remove the stopper (15) and the diaphragm plate
(13) and diaphragm (6) from the top stem (18).

Remove the stem rod plate (16) with inserted o-ring
(17) from top stem (18).

Mount the spring seats (11) and springs (12) on the
lower case (10).

Mount the the stopper (15) on the top stem (18).

Mount the diaphragm plate (13) and the diaphragm
(6).

Mount the stem rod plate (16) with inserted o-ring
(17) on the top stem (18).

Mount the lock washer (33a) and stem nut (33) and
tighten.

Mount the upper case (20).

Replace and tighten the long hexagon screws (24,
tension bolts) and hexagon nuts (25) in equal steps
until the cases meet.

Replace and tighten the remaining the short
CAUTION:
Diaphragm case is under spring tension and is equip-
ped with the long hexagon screws (24, tension bolts)
which must be removal last.
CAUTION:
Checking whether scratched on the top stem (18) and
dirty particles inside of the case and the diaphragm
and o-rings before reassembling.
NOTE:
Set the springs so that the coil ends are located toward
the actuator stem center, this will be assures best perfor-
mance of the actuator.
CAUTION:
Do not over tighten the hexagon screws as this could
possibly warp the diaphragm and cases, see torque
values on the table 6.
NOTE:
If actuator is equipped with the handwheel, rotate
handwheel to a 'AUTO' position.
CAUTION:
Diaphragm case is under spring tension and is equip-
ped with the long hexagon screws (24, tension bolts)
which must be removal last.
CAUTION:
Checking whether scratched on the top stem (18) and
dirty particles inside of the case and the diaphragm
and o-rings before reassembling.
NOTE:
Set the springs so that the coil ends are located toward
the actuator stem center, this will be assures best perfor-
mance of the actuator.