Instruction Manual
D103175X012
GX Valve and Actuator
July 2017
14
WARNING
If there is evidence of process fluid under pressure leaking from the joint, retighten the valve body/joint nuts and return to
the Warning at the beginning of the Maintenance section to ensure proper steps have been taken to isolate the valve and
relieve process pressure, thus avoiding property damage or personal injury.
5. If no fluid leaks from the joint, loosen the packing follower (key 29) two turns to relieve the packing compression
load.
6. For standard bonnet constructions (figures 18, 19, 20, and 21), remove the body nuts (key 7) completely.
For extension and bellows bonnet constructions (figures 22 and 23), remove the bonnet nuts (key 46) completely.
CAUTION
To avoid property damage, place the actuator yoke on a protective surface, as described in the following procedure.
7. Carefully lift off the actuator yoke and set it on a protective surface to prevent damage.
For standard bonnet constructions, if the bonnet (key 4) together with the valve stem plug assembly has a tendency
to lift with the actuator yoke, ensure it does not drop from the actuator.
For extension and bellows constructions, ensure the bonnet (key 4) does not lift with the actuator yoke.
For DN150 balanced constructions, if the bonnet, guide sleeve, or valve stem assembly have a tendency to lift with
the actuator yoke, ensure they do not drop from the actuator.
CAUTION
For extension and bellows bonnet constructions, lifting the bonnet with the actuator yoke may cause possible damage to
the valve plug and to the bellows.
8. Remove the stem adjustor nut (key 27) and locknut (key 28).
9. For standard bonnet constructions, remove the bonnet and the valve plug/stem assembly and set on a protective
surface.
For extension and bellows bonnet constructions, remove only the bonnet (key 4).
For DN150 balanced constructions, remove the guide sleeve, bonnet, and valve plug stem assembly.
Table 7. Packing Follower Torque
Valve Size Packing Style Torque NSm (lbfSft) Packing Style Torque NSm (lbfSft)
DN15, 20, 25, 40, and 50 ENVIRO-SEAL PTFE 10 (7.4) ENVIRO-SEAL ULF 35 (26)
DN80 and DN100 ENVIRO-SEAL PTFE 23 (17) ENVIRO-SEAL ULF 50 (37)
DN150 ENVIRO-SEAL PTFE 36 (26) ENVIRO-SEAL ULF 68 (50)
10. Remove the valve/yoke gasket (figures 18, 19, 20, and 21 key 5, figures 22 and 23 key 47) and cover the opening
of the valve to protect the gasket surface and prevent foreign matter from getting into the valve cavity.
11. Remove the packing follower (key 29) from the bonnet (key 4).
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.
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