1. Unscrew Locknut (piece #55) while holding Bronze Stem Nut (piece #54) or Steel
Bore and Key Bushing. Remove the Stem Nut and Key (piece #52).
2. Lubricate Stem. Run Stem Nut (piece #54) down Stem to verify Acme thread t.
Remove Stem Nut (piece #54) and set aside.
3. Model 3000-8000 may include thrust base assemblies. See Appendix for instructions.
3.2 Mechanical Installation onto the Valve
1. Lower actuator over Stem onto valve ange.
2. Insert the screws through the valve ange into the actuator and engage at least
one full screw diameter deep into the bottom base.
3. Tighten to a preload.
See Appendix for common bolt tightening torques.
NOTE:
Mounting screws are provided only if Emerson supplied the adapter. Verify screws are
through the adapter; engage a minimum of one screw diameter deep into the actuator
base.
4. Screw the Stem Nut (piece #54) onto the Stem until it enters the Drive Sleeve.
5. Place Key (piece #52) in line with the Drive Sleeve Keyway. Insert Key (piece #52).
6. Turn the handwheel in the Open direction to pull the Stem Nut (piece #54) into
the Drive Sleeve until it bottoms out.
NOTE:
Valve will begin to open.
7. Place the Locknut (piece #55) over the Valve Stem. Screw the Locknut
(piece #55) rmly into place against the top of the Stem Nut (piece #54)
using a drift to tighten.
8. Use a number 30 (0.1285) drill bit: drill a hole 3/4 inch (19mm) deep into the
Drive Sleeve assembly threads for the Locknut Lockpin (piece #56).
Use the groove in the Stem Nut Locknut threads as a guide.
9. Install Locknut Lockpin (piece #56) into drilled hole to prevent the
Stem Nut Locknut (piece #55) from working loose and turning.
NOTE:
When installing, the Locknut Lockpin (piece #56) should extend 1/4 inch (6mm) inch
above the Drive Sleeve assembly to allow for easy removal.
CAUTION:
Locknut must be screwed very tightly against stem nut.
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