Instruction Manual
D103175X012
GX Valve and Actuator
April 2011
15
6.
For standard bonnet constructions (figures 18, 19, 20, and 21)
, remove the body nuts (key 7) completely.
For extension and bellows bonnet constructions (figures 22 and 23)
, remove the bonnet nuts (key 46) completely.
CAUTION
To avoid property damage, place the actuator yoke on a protective surface, as described in the following procedure.
7. Carefully lift off the actuator yoke and set it on a protective surface to prevent damage.
For standard bonnet constructions
, if the bonnet (key 4) together with the valve stem plug assembly has a
tendency to lift with the actuator yoke, ensure it does not drop from the actuator.
For extension and bellows constructions
, ensure the bonnet (key 4) does not lift with the actuator yoke.
For DN150 balanced constructions,
if the bonnet, guide sleeve, or valve stem assembly have a tendency to lift with
the actuator yoke, ensure they do not drop from the actuator.
CAUTION
For extension and bellows bonnet constructions, lifting the bonnet with the actuator yoke may cause possible damage to
the valve plug and to the bellows.
8. Remove the stem adjustor nut (key 27) and locknut (key 28).
9.
For standard bonnet constructions
, remove the bonnet and the valve plug/stem assembly and set on a protective
surface.
For extension and bellows bonnet constructions
, remove only the bonnet (key 4).
For DN150 balanced constructions
, remove the guide sleeve, bonnet, and valve plug stem assembly.
Table 8. Packing Follower Torque
Valve Size
Packing Style
Torque N
S
m (lbf
S
ft)
Packing Style
Torque N
S
m (lbf
S
ft)
DN15, 20, 25, 40, and 50
PTFE
10 (7.4)
ULF
35 (26)
DN80 and 100
PTFE
23 (17)
ULF
50 (37)
DN150
PTFE
36 (26)
ULF
68 (50)
10. Remove the valve/yoke gasket (figures 18, 19, 20, and 21 key 5, figures 22 and 23 key 47) and cover the opening
of the valve to protect the gasket surface and prevent foreign matter from getting into the valve cavity.
11. Remove the packing follower (key 29) from the bonnet (key 4).
12. Remove the Belleville spring pack (key 34) and packing spacer (key 30) from the bonnet (key 4). Carefully push out
the remaining packing box parts from the bonnet (key 4) using a rounded rod or other tool which will not scratch
the packing box wall. Clean the packing box and the metal packing box parts.
CAUTION
Inspect the valve stem, threads and packing box surfaces for any sharp edges that might cut the packing. Scratches or burrs
could cause packing box leakage or damage the new packing.
13. Inspect the valve stem, threads and packing box surfaces for any sharp edges that might cut the packing.
Scratches or burrs could cause packing box leakage or damage the new packing. If the surface condition cannot be
improved by light sanding, replace the damaged parts.
14. Remove the covering protecting the valve cavity and install a new valve/yoke gasket (figures 18, 19, 20, and 21
key 5, figures 22 and 23 key 47) making sure that the gasket seating surfaces are clean and smooth.
