Instruction Manual
D103175X012
GX Valve and Actuator
April 2011
19
3. Remove the seat ring (key 2) from the valve body.
4. Inspect parts for wear or damage that would prevent proper operation of the valve body.
5. Replace trim parts as necessary.
Valve Trim Assembly
Assembly of Unbalanced Trim
Refer to figures 12, 18, 19, 20, 21, 22, 23, and 25.
1. Before installing the new seat ring / cage, thoroughly clean the threads in the valve body port. Apply suitable
lubricant to the threads and to the 60q surface of the new seat ring (key 4). Screw the seat ring into the valve body.
Using the seat ring tool, tighten the seat ring and torque according to the values in table 9. Remove all excess
lubricant after tightening.
2. For standard bonnet constructions, perform the following. (Proceed to step 3 for extension and bellows bonnets.)
a. Clean the body/yoke gasket seating surfaces and install a new body/yoke gasket (key 5).
b. Remove any protective tape or covering from the valve plug/stem assembly.
c. Insert the valve plug/stem assembly into the seat ring.
CAUTION
If the packing is to be reused and was not removed from the bonnet, perform the following step carefully to avoid
damaging the packing with the stem threads.
d. Install bonnet and actuator yoke onto the valve body by completing the assembly according to steps 15 to 27 of
the section Replacing Packing, omitting step 16 if new packing is not being installed.
3. For extension and bellows bonnet constructions, perform the following.
a. For bellows bonnet constructions, clean the extension bonnet/bellows gasket seating surfaces and install a new
bellows gasket (key 50).
b. Remove any protective tape or covering from the valve plug/stem assembly (key 3). Then insert the plug/stem
assembly (key 3) through the extension bonnet bushing (key 41).
c. Remove any protective tape or covering from the stem extension (key 40) or the bellows stem assembly (key
49). Screw the plug/stem assembly (key 3) into the stem extension or bellows/stem assembly. Note: Do not
apply lubricant to the threads of the plug/stem assembly (key 3) or the bellows/stem assembly (key 49).
Note
Ensure the stem assembly locking insert (figures 22 and 23, key 48) has been first inserted in the bottom of the threaded hole in
the stem extension.
CAUTION
In the following procedure, take precautions to ensure the valve plug and stem finish are not damaged.
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