Instruction Manual
Instruction Manual
D103175X012
GX Valve and Actuator
August 2011
19
27. Tighten the stem connector cap screws (key 25) to 35 Nm(26lbfft).
28. Tighten the packing follower (key 29) to the torque specified in table 7.
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. For DN 15 through DN 100 (NPS 1/2 through 4), loosen the packing follower 60_ of rotation.
29. Ensure that the electric actuator maximum thrust output does not exceed the values in table 11.
Valve Trim Maintenance
Key numbers in this section refer to figures 18, 19, 20, 21, 22, and 23.
Valve Trim D isassembly
1. Remove the actuator and bonnet assembly as described in the Replacing Packing section (steps 1 through 10).
D For standard bonnet constructions (figures 18, 19, 20, 21, and 25), proceed to the Seat Ring / Cage Removal
section.
D For extension bonnet constructions (figure 22), proceed to step 3.
D For bellows bonnet constructions (figure 23), proceed to step 2.
2. For bellows bonnet constructions (figure 23), use a bellows nut tool made according to the dimensions in figure 26
and table 13 to remove the bellows nut (key 51) as follows:
a. Insert the bellows nut tool into the extension bonnet (key 39). Be certain the tool lugs are engaged in the
corresponding recesses in the bellows nut.
b. Use a torque gun or driver having sufficient torque capabilities according to table 10. Connect the gun to a
socket that snugly fits the hex head on the bellows nut tool.
c. Insert the socket onto the hex head of the bellows nut tool.
WARNING
Be careful to hold t he torque gun, attached socket, and tool at right angles to the bellows nut when applying torque. Tilting
the gun and socket while applying torque may cause the lugs on the bellows nut tool to suddenly disengage from the lugs
on the bellows nut thus causing possible damage to the bellows nut and possible personal injury.
d. Remove the bellows nut (key 51).
3. For both extension and bellows bonnet constructions: Body nuts (key 7) attach the extension bonnet (key 39) to the
valve body (key 1). Loosen these nuts approximately 3mm (1/8 inch). Then loosen the extension bonnet-to-body
gasketed joint by either rocking the extension bonnet or prying between the body and extension bonnet. Work the
prying tool around the extension bonnet until it loosens.
4. Removethebodynuts(key7)completelyandcarefullylift the extension bonnet (key 39), and valve plug/stem
extension assembly (key 3, 40 and 48) or plug/bellows/stem extension assembly (key 3, 49 and 48) from the top of
the valve body.