Instruction Manual
D103312X012
GX 3-Way Valve and Actuator
August 2011
11
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 NSm(lbfS ft) Packing Style Torque NSm(lbfSft)
DN25 and 40 PTFE 10 (7.4) ULF 35 (26)
DN50, 80, and 100 PTFE 23 (17) ULF 50 (37)
15. Install a new O-ring (key 81) in the groove on the bottom of the side-port common bonnet (key 4). See figure 9.
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.
17. Install the new packing and the metal packing box parts according to figure 7 for PTFE packing and according to
figure 7 for 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
valvebody(key1).
D For HT constructions, see figure 12. Install the locknut (key 108) and stem extension (key 106). Install the valve
plug/bonnet sub assembly into the valve body (key 1).
19. Mount the actuator onto the valve and install the body nuts (figure 8 key 7), but tighten them only finger-tight.
20. For fail-down constructions, connect a separate air supply to the lower diaphragm casing air supply connection (as
shown in figure 11) and apply sufficient air pressure to raise the actuator rod (key 22) to the travel stop. Proceed to
the next step.
For fail-up constructions, proceed to the next step.
21. Tighten the valve body nuts (key 7) evenly using a cross-tightening procedure. See table 3 for torque
requirements.
D For HT constructions, see figure 12. Ensure the valve body nuts (key 7) are tightened at the valve body (key 1)
and at the top of the yoke extension (key 105).
22. Thread the lower stem connector (key 27) up to match the gap setting between the actuator rod and stem
adjustor nut specified in table 2. Thread the locknut (key 28) up against the stem locknut and tighten to a torque of
48 NSm(35lbfSft) for 10mm stems or 175 NSm (129 lbfSft) for 14mm stems.
D For HT constructions see figure 12. With the valve plug/stem (key 3) on the lower seat, thread the stem
extension (key 106) up to match the gap setting between the actuator rod and stem extension specified in
(36 strony)
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