Instruction Manual
D103175X012
GX Valve and Actuator
July 2017
20
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.
5. Use a wrench to unscrew the plug/stem assembly (key 3) from the stem extension (key 40) or from bellows/stem
assembly (key 49) as follows:
a. Insert the wrench onto the stem extension hex flats (see figures 22 and 23).
CAUTION
In the following procedure, take precautions to ensure the valve plug and stem finish are not damaged.
b. Clamp the plug/stem assembly (key 3) and holding it stable, unscrew the stem extension (key 40) or
bellows/stem assembly (key 49). Take precautions to ensure the valve plug and stem finish are not damaged.
Note
There is a stem assembly locking insert (figures 22 and 23, key 48) in the valve plug/stem extension assembly. It is possible this
insert may drop out during stem disassembly. If this is the case, ensure it is retained for reassembly of the valve stem to the stem
extension.
6. Remove the plug/stem assembly (key 3) and bellows/stem assembly (key 49) from the extension bonnet. Remove
the bellows gasket (key 50).
7. Proceed to the Seat Ring Removal section.
Seat Ring / Cage Removal
CAUTION
Use care to avoid damaging the gasket sealing surfaces.
The surface finish of the valve stem (key 3) is critical for making a good packing seal. The seating surfaces of the seat ring
(key 2), cage (key 99), and the valve plug (key 3) are critical for tight shutoff and should therefore also be treated with care
and properly protected.
1. Packing parts can be removed from the bonnet if desired. Replace these parts as described in the section on Packing
Maintenance.
2. Use a seat ring tool made according to the dimensions in figure 5 and table 12 to remove the seat ring (key 2) as
follows:
a. Insert the tool into the valve body. Be certain the tool lugs are engaged in the corresponding recesses in the seat
ring.
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