Instruction Manual
D103312X012
GX 3-Way Valve and Actuator
August 2011
14
19. 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.
20. Carefully install the bonnet (key 4) onto the valve stem.
21. 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).
22. Install the locknut (key 28) and lower stem connector (key 27). Ensure they are aligned with the mark made on the
stem disassembly and tighten. Install the valve plug/bonnet sub assembly into the valve body (key 1).
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).
23. Mount the actuator onto the valve and install the body nuts (figure 8 key 7), but tighten them only finger-tight.
24. 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).
25. Push the valve plug/stem to the valve seat. Thread the lower stem connector (key 27) and the locknut (key 28) to
the previously marked position 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) and the locknut (key 108) to the previously marked position and tighten to a torque of 48
N•m (35 lbf•ft) for the 10mm stems or 175 N•m (129 lbf•ft) for 14mm stems.
26. Stroke the actuator rod until it contacts the lower stem connector (key 27) or stem extension (key 106, figure 12)
and install the stem connector halves and travel indicator (keys 23, 24, and 26) with the cap screws (key 25). Install
the stem connector halves in the proper orientation so that when looking at the inside of the stem connector
halves, the flats are down and the beveled surfaces are up.
27. Align the pointer of the travel indicator (key 26) with the appropriate mark on the travel scale.
28. Tighten the stem connector cap screws (key 25) to 35 Nm(26lbfft).
29. Tighten the packing follower (key 29) to the torque specified in table 4.
Alternately, the packing follower can be tightened by the following method:
a. Tighten the packing follower until the Belleville springs are compressed 100% (or completely flat), as detected by
a rapid increase in nut torque.
b. Loosen the packing follower 60_ of rotation.
30. Ensure that the electgric actuator maximum thrust output does not exceed the values in table 5.
Table 5. GX 3-Way Electric Actuator Maximum Allowable Thrust
VALVE SIZE
STEM DIAMETER TRAVEL
STEM MATERIAL
MAXIMUM THRUST
FORACTUATORTRAVELUPANDDOWN
mm mm N lbf
DN25-DN40
(NPS 1 to 1-1/2)
10 19 316L SST 6900 1550
DN50 (NPS 2) 14 19 316L SST 14000 3150
DN80-DN100
(NPS 3 to 4)
14 38 316L SST 14000 3150
(36 pages)
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