Flowserve 50165 Nordstrom Figure - Manual (Page 31)

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Nordstrom Figure 50165 and 50169 Dynamic Balance Iron Plug Valve FCD NVENIM2006-00 – 09/05
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Cause 4: Plug seized in the Body taper
Solution: Adjust the Plug.
1. If the plug cannot be unseated by sealant injection, remove the Plug Adjusting Screw cover.
2. Turn the Plug Adjusting Screw counterclockwise 1/8 turn.
3. Inject sealant into the valve and move the Plug Adjusting Screw back and forth, until the Plug lifts
off of the Body taper.
4. Once the Plug has lifted off of the body taper, retighten the Plug Adjusting Screw until the valve
becomes difficult to operate.
5. Loosen the Plug Adjusting Screw 1/8 turn.
6. Inject sealant into the valve.
Problem: Cover leakage
Cause 1: Damaged Gasket
Solution: Replace the Gasket. It is recommended that the old Gasket be replaced with new parts
whenever the Cover is removed from the valve.
The valve must be removed from line pressure before removing the Cover.
1. Be sure there is no pressure trapped in internal cavities of the valve (refer to the Introduction).
Operate the valve one complete quarter-turn cycle, and then put the valve in the full open position. If
your valve is equipped with a Relief Fitting, loosen the fitting as a final release for pressure, and then
tighten it.
2. Remove the hex head cap screw, or thin, bolted plate, located on the bottom Cover of the valve. This
exposes the Plug Adjustment Screw, the threads of which have been treated with a thread-locking
compound at the Nordstrom factory.
3. Loosen the Plug Adjustment Screw until there is no mechanical load on it.
4. If the valve is installed vertically, support may be required for the Cover so that the internal parts,
which are secured by the Cover, will not fall out when the Cover Bolts are removed.
5. Loosen and remove the Cover Bolts. Remove the support piece and carefully remove the Cover,
Ball, and Ball Seat.
6. Carefully remove the Gasket and all traces of it from the valve Body.
7. Apply a film of sealant on the entire surface of the large end of the plug.
8. Place the new Gasket onto the Body.
9. Place the Ball on the Plug.
10. Place the Ball Seat and O-rings into the Cover.
11. Place the Cover on the valve.
12. Lubricate the Cover Bolts with a quality thread lubricant.