NIBCO High-Performance Butterfly Valve - Manual (Page 7)

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7
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Revised 8/22/2013
7. Maintenance:
7.1 Typical maintenance consists of periodic inspection and exercising (cycling) of the valve to assure proper function.
7.2 Fluid leakage at weep hole near top of valve neck below flange is an indication that the stem packing needs tightened.
Evenly tighten both nuts (8) below valve top flange ¼ turn each until leakage stops. It is important to adjust nuts evenly
and not to over-tighten or premature stem packing wear will occur.
7.3 If repair parts or service information is required, please locate valve Identification Plate (23) and supply following information:
• Valve Figure Number
• Valve Size
• Valve Class
• Manufacture Date Year
• Valve Serial Number
• Type of Actuator
7.4 Three individual repair kits are available for each size valve.
• Stem seal kit including Packing Set (5), Packing Retainer (6), and Lower Seal (19).
• Standard RPTFE Seat (13) 15% glass reinforced PTFE
• Special 25% carbon filled Seat (13) for severe steam service.
7.5 Some individual component parts can be ordered. Contact NIBCO for availability.
Precautions Prior to Valve Removal from Piping or Repair
7.6 Turn off supply pressure to piping in which valve is located. Lock-out & Tag-out per established safety procedure.
7.7 Identify media in piping and determine how to safely drain piping. Use proper personal protection clothing
and supplies as needed.
Removal of Valve from Piping
7.8 Check to confirm piping has been depressurized and drained.
7.9 Actuate valve until in full CLOSED Position.
7.10 Attach appropriate lifting strap or sling to valve neck. Attach other end of strap or sling to secure point capable of
supporting valve weight.
7.11 Disconnect any supply lines (air and electric) to actuator if applicable. Lock-out & Tag-out per established safety procedure.
7.12 Unloosen and remove all cap screws from mating pipe flanges.
7.13 Remove valve from between flanges. Remove old gaskets and clean piping flange seal surfaces of old gasket residue.
7.14 Note that any time the valve is removed from between flanges, it if necessary to re-torque seat retainer cap screws (10).
Installation, Operation and Maintenance Instructions
NIBCO 6822 and 7822 Series High Performance Butterfly Valves