Instruction Manual

Instruction Manual
D103175X012
GX Valve and Actuator
August 2011
22
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 60 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 8. 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.
d. Clamptheplug/stemassembly(key3)andholditstable. Using a box spanner tool tighten the plug/stem
assembly (key 3) into the stem extension (key 40) or into the bellows/stem assembly (key 49) according to the
stem extension torque requirements listed in table 9. Take precautions to ensure the valve plug and stem finish
are not damaged.
e. For bellows bonnet constructions, apply suitable lubricant to the threads and to the bottom surface of the
bellows nut (key 51). Screw the bellows nut into the extension bonnet. Using the bellows nut tool, a lathe or
boring mill, tighten the bellows nut or torque according to the values in table 10. Remove all excess lubricant.