4 GV 76 en
11
D. Actuator replacement (mounting) for VD Direct<air
to close, stem extend> actuator (Fig. 13)
Mount the new or repaired actuator on top of the
bonnet, using a suitable lifting device to setting.
Insert the yoke nut and tightly fasten the yoke by
turning the yoke nut clockwise using tightening
tools.
Connect air line and accessories.
Down the top stem (18), using by specified air pres-
sure.
Adjust stem length after clamping the clamp (1**)
according to rated travel (stroke) as ‘open’ and ‘close’
position as per pressurizing and depressurizing the
upper diaphragm chamber.
Tighten stem socket head screws (1a**) and hexa-
gon nuts (1b**) with stem lock nut (5**).
E. Actuator removal for VC actuator (Fig. 14)
Shut off and disconnect the air supply lines and
accessories.
Loosen the plug stem locknut and the 4 socket head
screws (26a) on the clamp (26).
Remove the clamp (26).
Support the actuator with the suitable lifting device.
Remove the hexagon screws from the valve bonnet.
Remove the actuator from the valve body assembly.
F. Actuator replacement (mounting)for VC actuator
(Fig. 14)
Mount the new or repaired actuator on top of the
valve bonnet, using a suitable lifting device.
Insert the hexagon screws and tightly fasten the
yoke by turning the hexagon screws clockwise using
tightening tools.
Connect air line with actuator.
Down the top stem (18), by using specified air
pressure.
Adjust stem length after clamping the clamp (26)
according to rated travel (stroke) as ‘open’ and ‘close’
position as per pressurizing and depressurizing the
both side of cylinder chambers.
Tighten the 4 socket head screws (26a) on the clamp
(26) and the lower stem locknut.
Fig. 14
VC Actuator
CAUTION:
Avoid to turn the valve plug and stem when plug is on
seat ring to prevent the seating line from being damaged.
VC, without volume chamber
VC, with volume chamber
VC Actuator part
1. YOKE
1A. HEXAGON SCREW
1B. WASHER
18 TOP STEM
21. LIFTING EYE NUT
30. IDENTIFICATION PLATE
30A. RIVET
32. INDICATOR
32A. ROUND HEAD SCRREW
60. TOP COVER
61. BOTTOM COVER
66A. TIE ROD
66C. HEXAGON SCREW
66D. WASHER
V-A (Valve-Actuator) Mounting Part (**)
1b** HEXAGON NUT
5** STEM LOCK NUT
6** LOCK WASHER
26** CLAMP
26a**SOCKET HEAD SCREW
26b** INDICATOR ARROW
