Flowserve 50165 Nordstrom Figure - Manual (Page 33)


Nordstrom Figure 50165 and 50169 Dynamic Balance Iron Plug Valve FCD NVENIM2006-00 – 09/05
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Problem: Leakage at the Stem
Cause 1: Line pressure is bypassing Stem O-rings.
Solution: Replace Stem O-rings.
Line pressure must be removed from valve before changing Stem O-rings.
1. Make sure there is no internal pressure trapped inside the valve. Operate the valve one complete
quarter-turn cycle, and then place the valve in the full open position.
2. For wrench operated valves – Remove the Retaining Ring and Stop Collar.
3. For gear operated valves – Remove the Position Indicator and Gearing. Remove the Gear Segment
and Segment Key from the Stem.
4. For wrench operated valves – Remove the Gland Bolts and the Gland with Weatherseal.
5. For gear operated valves – Remove the Gland Bolts and the Gland.
6. Remove the existing O-rings and thoroughly clean the Gland.
7. Install the new Stem O-rings.
8. Prepare the Gland for installation.
a) For wrench operated valves – Examine the Stem Weatherseal and replace it if necessary.
b) For wrench and gear operated valves – Apply sealant to the inside diameter of the Gland.
9. Install the Gland.
Apply a thin film of good quality gasket compound to the mating surface of the Body or Gland and
install the Gland. On wrench operated valves the stop lug is to the left when facing the front of the
valve.
10. Lubricate the Gland Bolts with a good quality thread lubricant and install.
11. Tighten the Gland Bolts as described in the section Tightening Cap Screws and Nuts.
12. Install the Stop Collar (remember to position it so the valve will turn clockwise to close and
counterclockwise to open) and the Retaining Ring.
13. Inject sealant.
Problem: Sealant Fitting leakage
Cause: Line pressure bypassing Check Valve.
Solution: Leakage at the Sealant Fitting indicates there is leakage around or through the Check Valve
(located behind the Sealant Fitting). Follow the Steps as listed in Cause 3 of Sealant System Blockage.
Problem: Check Valve leakage
Cause 1: The Check Valve ball is not seating properly.
Solution: Clean or replace the Check Valve. Follow the Steps as listed in Cause 3 of Sealant System
Blockage.