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KEYSTONE FIGURE 221/222 BUTTERFLY VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
TROUBLESHOOTING
Symptom
Valve opens only a few degrees and stops
(it will not open to the full angle desired)
Leakage past the flange face
Leakage in the closed position
(leakage in the pipeline)
Excessively high torque
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Probable cause
Improper installation. The valve is improperly aligned Loosen the flange bolts, re-align the valve with flanges, and
1. Flange bolts are not evenly torqued
2. Improper flanges
The disc is not closing fully:
1. Actuator is not properly adjusted
2. Line pressure exceeds the valve's working pressure
1. Obstruction in the pipeline
2. Scale build-up on stem or seat
Solution
re-tighten the flange bolts to correct torque per ANSI requirements
1. Loosen the flange bolts and tighten the flange bolts to the correct
torque per ANSI requirements
2. Refer to "Flange and pipeline compatibility" on page 1
1. Refer to actuator adjustment procedures
2. Reduce line pressure to the valve's working pressure
1. Remove valve from pipeline and remove obstruction
3. Open and close the valve several times. Operate the valve at least
once a month. Check the valve seat for deterioration
4
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