Instruction Manual
D103175X012
GX Valve and Actuator
April 2011
17
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.
For DN 150 (NPS 6), loosen the packing follower 90_ of rotation.
26. For air‐to‐open, release the actuator pressure.
27. For air‐to‐open, ensure the vent (key 21) is installed into the upper diaphragm casing (see figure 18 or 19).
For air‐to‐close, ensure the vent (key 21) is installed into the actuator yoke air supply connection (see figure 20 or
21).
Valve Trim Maintenance
Key numbers in this section refer to figures 18, 19, 20, 21, 22, and 23.
Valve Trim Disassembly
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 12 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 11. 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 the 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. Remove the body nuts (key 7) completely and carefully lift 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.
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