Metso AS series, Руководство по эксплуатации

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10 4 GV 76 en
6 REMOVAL & MOUNTING THE
ACTUATOR
The actuator is attached to the valve according to the manual
for actuator with body assembly and plug stem adjustment.
Several types of Metso actuators can be used with suitable
clamps. Refer to the model VD spring-diaphragm and VC
double acting cylinder actuator manuals for further informa-
tion on their installation, maintenance and operation.
A. Actuator removal for VD Reverse<air to open, stem
retract> actuator (Fig. 13)

Lift up to the valve plug 100% from the seat ring,
using by specified air pressure.

Loosen the stem lock nut (5**) and socket head
screws (1a**) and hexagon nuts (1b**).

Remove the clamp (1**).

Shut off and disconnect air supply line.

Support actuator with the suitable lifting device.

Remove the yoke nut (3**).

Remove the actuator from the valve body assembly.
B. Actuator replacement (mounting) for VD Reverse<air
to open, stem retract> actuator (Fig. 13)

Mount the new or repaired actuator on top of the
bonnet, using a suitable lifting device.

Insert the yoke nut and tightly fasten the yoke by
turning the yoke nut clockwise using tightening
tools.

Connect air line and accessories.

Lift the top stem (18), using by specified air pressure.

Adjustment stem length after clamping the
clamp (1**) according to rated travel(stroke) as
‘open’ and ‘close’ position as per pressurizing and
depressurizing the lower diaphragm chamber.

Tighten stem socket head screws (1a**) and hexa-
gon nuts (1b**) with stem lock nut (5**).
C. Actuator removal for VD Direct<air to close, stem
extend> actuator (Fig. 13)

Shut off and disconnect the air supply lines and
accessories.

Loosen stem lock nut (5**) and stem socket head
screws (1a**) and hexagon nuts (1b**).

Remove the clamp (1**).

Support actuator with the suitable lifting device.

Remove the yoke nut (3**).

Remove the actuator from the valve body assembly.
Fig. 13 VD Actuator
CAUTION:
Beware of the plug movement!
Do not use air pressure higher than what specified on the
identification plate.
Direct Action actuator
(Air to Close, stem extend)
Reverse Action actuator
(Air to Open, stem retract)
VD Actuator part
1. YOKE 10. LOWER CASE 18 TOP STEM 20. UPPER CASE
21. LIFTING EYE NUT 22. WASHER 23. HEXAGON SCREW 24. HEXAGON SCREW
25. HEXAGON NUT 30. IDENTIFICATION PLATE 32. INDICATOR 32a. ROUND HEAD SCRREW
34. VENT CAP 99. AIR SUPPLY PORT
V-A (Valve-Actuator) Mounting Part (**)
1** CLAMP 1a**SOCKET HEAD SCREW
1b** HEXAGON NUT 3**YOKE NUT (see above VD fig.)
5** STEM LOCK NUT 6** LOCK WASHER