Instruction Manual
D103312X012
GX 3-Way Valve and Actuator
August 2011
13
7. 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.
8. 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.
9. If no fluid leaks from the joint, loosen the packing follower (key 29) two turns to relieve the packing compression
load.
10. 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.
11. 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.
12. 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).
13. Remove the bonnet and the valve plug/stem assembly and set on a protective surface.
14. 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.
15. Remove the packing follower (key 29) from the bonnet (key 4).
16. 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.
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.
17. 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.
18. Remove the covering protecting the valve cavity and install a new valve/yoke gasket (key 5) making sure that the
gasket seating surfaces are clean and smooth.
(36 pagine)
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