Metso VD Series, Installation, Maintenance And Operation Instructions

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8 6 DA 70 en

Mount the spring seats (11) and springs (12).

Mount the diaphragm plate (13) with the stopper
(15) on the top stem (18).

Mount the replaced diaphragm (6).

Insert the replaced O-ring (17).

Mount the stem rod plate (16) and lock washer (33a),
stem nut (33) and tighten.

Mount the upper case (20).

Tighten the long hexagon screws (24, tension bolts)
the hexagon nuts (25) in equal steps until the cases
meet.

Replace the remaining the short hexagon screws
and nuts.
4.3 Replacement diaphragm for VDR,
Air to open
See Fig. 5 and Exploded view.
We recommend that all seals be replaced when the actua-
tor 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).

Remove the short hexagon screws (23, 24, dia-
phragm case bolts) and the hexagon nuts (25).

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).

Remove the diaphragm (6) and the diaphragm plate
(13) with the stopper (15) and O-ring (17) from the
top stem (18).

Replace the U-packing (4) and O-ring (5) in the stem
guide (2).

Mount the stem rod plate, the replaced O-ring (5),
diaphragm (6) and the diaphragm plate (13) with the
stopper (15) the top stem (18). Then, tighten.

Mount the spring seats (11) and springs (12).

Mount the upper case (20).

Tighten the long hexagon screws (24, tension bolts)
the hexagon nuts (25) in equal steps until the cases
meet.

Replace the remaining short hexagon screws and
nuts.
4.4 Operation the handwheel
See Fig. 6 and 7.

Check the current valve position should be 'AUTO'
position (see the stroke indicator, which is open or
close).

Turn over the locking device to release the
handwheel.

Operate the handwheel to be open or close position
--- Manual mode.

Return the stem position to be 'AUTO' position.

Return the locking device to be locked with the
'AUTO' position --- Auto mode.
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 as this could possibly warp the
diaphragm cases.
NOTE:
If actuator is equipped with the handwheel, rotate
handwheel to a neutral 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 stem guide (18)
and dirty particles inside of the stem guide (2) 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.
NOTE:
Lubricate seal space and new O-ring with Unisilikon L250L
or equal silicone grease.
CAUTION:
Do not over tighten as this could possibly warp the
diaphragm cases.
CAUTION:
Don`t operate the handwheel while the locking device
engaged, it can cause damage.