Instruction Manual
D103175X012
GX Valve and Actuator
July 2017
15
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 (figures 18, 19, 20, and 21
key 5, figures 22 and 23 key 47) making sure that the gasket seating surfaces are clean and smooth.
For DN150 balanced constructions, two gaskets are required; one between the valve body and guide sleeve, and
the other between the guide sleeve and bonnet. Ensure the gasket seating surfaces are clean and smooth for both
gaskets.
15. Carefully install the bonnet (key 4) onto the valve stem.
16. Install the new packing and the metal packing box parts according to figure 15 for ENVIRO-SEAL PTFE packing and
according to figure 16 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).
17. Install the locknut (key 28) and stem adjustor nut (key 27).
For standard bonnet constructions, install the valve plug/bonnet sub assembly into the valve body (key 1).
18. Mount the actuator onto the valve and install the body nuts (figures 18, 19, 20, 21 key 7, figures 22 and 23 key
46), but tighten them only finger‐tight.
19. For air‐to‐open, connect a separate air supply to the lower diaphragm casing air supply connection (as shown in
figure 18 or 19) and apply sufficient air pressure to raise the actuator rod (key 22) to the travel stop. Proceed to the
next step.
For air‐to‐close, proceed to the next step.
20. For standard bonnet constructions, tighten the body nuts (key 7) evenly using a cross‐tightening procedure. See
table 4 for torque requirements.
For extension and bellows bonnet constructions, tighten the bonnet nuts (key 46) evenly using a cross‐tightening
procedure. See table 5 for torque requirements.
21. Thread the stem lock adjustor (key 27) up until it is the rated travel distance specified in table 3 from the actuator
rod (key 22). Thread the locknut (key 28) up against the stem locknut and tighten to the torque specified in table 6.
22. Stroke the actuator rod until it contacts the stem adjuster nut (key 27) 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.
23. Align the pointer of the travel indicator (key 26) with the appropriate mark on the travel scale.
24. Tighten the stem connector cap screws (key 25) to 35 N•m (26 lbf•ft).
Table 8. Seat Ring / Cage Torque Requirements
VALVE SIZE TORQUE
DN NPS NSm lbfSft
15, 20, 25 1/2, 3/4, 1 170 124
40 1‐1/2 320 234
50 2 460 337
80 3 1020 747
100 4 1520 1113
150 6 3400 2500
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