Instruction Manual
D103312X012
GX 3-Way Valve and Actuator
August 2011
10
Note
The following step also provides additional assurance that the valve body fluid pressure has been relieved.
2. For fail-up constructions, as shown in figure 8:
a. Connect a separate air supply to the air supply connection on the upper casing (shown in figure 8) and apply
sufficient air pressure to move the plug/stem to mid-travel.
b. Remove the stem connector nut half (key 23), stem connector bolt half (key 24), and travel indicator (key 26).
c. Shut off the air pressure and disconnect the air supply to the upper casing.
3. Valve body nuts (key 7) attach the actuator yoke (key 8) to the valve body (key 1). Loosen these nuts approximately
3mm (1/8 inch).
D For HT constructions, see figure 12. Nuts (key 7) attach the yoke extension (key 105) to the valve body (key 1).
Loosen these nuts approximately 3mm (1/8 inch). It is not necessary to loosen the nuts which attach the
actuator yoke (key 8) to the yoke extension.
4. Then loosen the valve-to-yoke gasketed joint by either rocking the actuator yoke or prying between the valve and
yoke. Work the prying tool around the yoke until it loosens.
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.
5. If no fluid leaks from the joint, loosen the packing follower (key 29) two turns to relieve the packing compression
load.
6. Remove the body nuts (key 7) 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 and set it on a protective surface to prevent damage. If the bonnet (key 4) together
with the valve stem plug assembly has a tendency to lift with the actuator, ensure it does not drop from the
actuator.
8. Remove the lower stem connector (key 27) and locknut (key 28).
D For HT constructions, see figure 12. Remove the stem extension (key 106) and locknut (key 108).
9. Remove the bonnet and the valve plug/stem assembly and set on a protective surface.
10. Remove the valve/yoke gasket (key 5) 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).
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