Flowserve Butterfly Valve - Manual (Page 10)

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6.0 MAINTENANCE
6.1 Valve Maintenance Instructions
The Flowserve Butterfly Valve is relatively maintenance free with the exception of
periodic tightening of the Gland Stud Nuts. This tightening should be performed
as soon as any evidence of shaft leakage occurs. The following is a list of some
of the common malfunctions of extended performance Butterfly Valves:
1. Shaft Packing Leakage:
A. Tighten Gland Stud Nuts
B. Replace Gland Packings
2. Leakage between Flange and Valve:
A. Tighten Flange Bolts
B. Replace Flange Gaskets
3. Leakage through Valve Seat:
A. Clean Seat and Retainer Groove
B. Replace Seat Replace Disc and Shaft
4. Excessive Torque:
A. Check alignment of valve actuator and adjust if required
B. Replace bushings if slight galling has occurred on shaft
C. Replace bushings and shaft if galling is excessive
If questions arise on the preceding instructions, contact the factory.