NIBCO High-Performance Butterfly Valve User Manual
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Revised 8/22/2013
Installation, Operation and Maintenance Instructions
NIBCO 6822 and 7822 Series High Performance Butterfly Valves
Manual Gear Operator Adjustment
4.5
Verify cap screws attaching gear operator to the valve are securely tight. Rotate handwheel clockwise until it stops; disc
should be visually centered in the seat. If not, adjustment is necessary. Locate gear operator CLOSED stop set screw.
Unlock adjustment stop set screw by removing outer locking set screw or loosening locking nut. Rotate adjustment stop
set screw counter-clockwise 2 turns. Rotate handwheel until disc is visually centered in the seat. Rotate adjustment stop
set screw clockwise until it stops. Lock adjustment stop set screw by reinstalling outer locking set screw or tightening
locking nut. Rotate handwheel counter-clockwise opening valve. Rotate handwheel clockwise until it stops and check disc
to verify it is visually centered in the seat. If not, repeat adjustment procedure until it is.
4.6
Adjustment of OPEN stop can be achieved by similar adjustment of the OPEN stop set screw. The OPEN stop adjustment
is not critical; ±5° travel is adequate.
Electric Actuator Adjustment
4.7
Verify cap screws attaching the actuator to the valve are securely tight. Remove top cover of actuator exposing electrical
limit switches and cams. Use caution when working on this as electrical connections are exposed causing
potential electric shock hazard. Operate actuator to CLOSED position. Visually inspect the disc to assure it is centered
in the seat. If not, determine if valve in not fully closed or past closed. Unloosen CLOSED stop position cam set screw and
rotate slightly in the desired direction, then retighten set screw. Open valve, then operate valve to closed position. Visually
inspect the disc to assure it is centered in the seat. If not, repeat process until disc is centered in seat.
4.8
Adjustment of OPEN stop can be achieved by similar adjustment of the OPEN stop cam. The OPEN stop adjustment is not
critical; ±5° travel is adequate.
Pneumatic Actuator Adjustment
4.9
Verify cap screws attaching the actuator to the valve are securely tight. Operate actuator to CLOSED position. Visually
inspect the disc to assure it is centered in the seat. If not, adjustment is necessary. Locate actuator CLOSED stop set
screw. Unlock adjustment stop set screw by removing outer locking set screw or loosening locking nut. Rotate adjustment
stop set screw counter-clockwise 2 turns. Rotate valve until disc is visually centered in the seat. Rotate adjustment stop
set screw clockwise until it stops. Lock adjustment stop set screw by reinstalling outer locking set screw or tightening
locking nut. Operate actuator opening valve. Operate actuator CLOSED and check disc to verify it is visually centered in
the seat. If not, repeat adjustment procedure until it is.
4.10
Adjustment of OPEN stop can be achieved by similar adjustment of the OPEN stop set screw. The OPEN stop adjustment
is not critical; ±5° travel is adequate.