Instruction Manual
D103312X012
GX 3-Way Valve and Actuator
July 2017
11
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 and set it on a protective surface to prevent damage. If the bonnet (key 4) together
with the valve stem plug assembly has a tendency to lift with the actuator, ensure it does not drop from the
actuator.
8. Remove the lower stem connector (key 27) and locknut (key 28).
D
For HT constructions,
see figure 12. Remove the stem extension (key 106) and locknut (key 108).
9. Remove the bonnet and the valve plug/stem assembly and set on a protective surface.
10. Remove the valve/yoke gasket (key 5) 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 (key 5) making sure that the
gasket seating surfaces are clean and smooth.
Table 4. Packing Follower Torque
Valve Size
Packing Style
Torque N
S
m (lbf
S
ft)
Packing Style
Torque N
S
m (lbf
S
ft)
DN25 and 40
ENVIRO-SEAL PTFE
10 (7.4)
ENVIRO-SEAL ULF
35 (26)
DN50, 80, and 100
ENVIRO-SEAL PTFE
23 (17)
ENVIRO-SEAL ULF
50 (37)
Apply a general purpose silicone base lubricant.
D
For HT constructions,
see figure 12. Install a new graphite seal ring (key 107). Apply a general purpose silicone
base lubricant.
16. Carefully install the bonnet (key 4) onto the valve stem.
according to figure 7 for ENVIRO-SEAL graphite ULF packing. Place a smooth‐edged pipe over the valve stem and
gently tap each soft packing part into the packing box. Apply anti‐seize lubricant to the threads and install the
packing follower (key 29).
18. Install the locknut (key 28) and lower stem connector (key 27). Install the valve plug/bonnet sub assembly into the
valve body (key 1).