Emerson Fisher GX Instruction Manual page 17

Instruction Manual
February 2009
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).
GX Valve and Actuator
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. Clamp the plug/stem assembly (key 3) and
hold it stable. 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 10.
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 11. Remove all excess lubricant.
f. Clean the body/extension bonnet seating
gasket surface and install the gasket (key 5).
g. Install the extension bonnet and plug/stem
assembly onto the valve body. Install the
body/yoke nuts (key 7) and tighten evenly using a
cross-tightening procedure. See table 4 for torque
requirements.
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.
h. Install the bonnet and actuator yoke onto the
extension bonnet 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.
Assembly of Balanced Trim
(Available in DN 80, 100, and 150 [NPS 3, 4, and 6]
only)
17