Installation, Operation and Maintenance Manual
Butterfly Valves Type 56, 75, 56D, 75D 15
(9) Operating Procedure
- Do not use the valve to fluid containing slurry. (The valve will not operate properly.)
- The installed valve must never be opened or closed when foreign matter such as sand is present in
the pipeline.
- Do not exert excessive force in closing the valve.
- When operating the handle, be sure to do so with your hand. (Using a tool may damage the handle.)
The indicator shows the position of the disc on the top of gear box.
For the full-shut position, the indication shows Shut [S].
For the full-opened position, the indication shows Open [O].
Gear Type (Type 3) 󲷇Butterfly Valve Type 56, 56D: Nominal Size 400mm (16”)󲷈
Gear Type (BVG-2H) 󲷇Butterfly Valve Type 75, 75D: Nominal Size 450-600mm (18”-24”)󲷈
Top Gear Type (RVA-03-UG/ RVA-04-UG) 󲷇Butterfly Valve Type 56, 56D, 75, 75D: Nominal Size 400-600mm (18”-24”)󲷈
Technical Data for Operation of Gear Type (Type 3/ AB1250N)
Nominal Size Stem Torque Diameter of
Handle
Required Operating Force (N)
Body Material PP, PVDF PDCPD PP, PVDF PDCPD
mm inch Nm Nm mm N N
400 16” 760 1300 300 170 290
450 18” 820 1500 400 127 236
500 20” 1150 1800 400 178 286
600 24” 1600 1900 400 248 302
Note: Data mentioned in the table above is reference only.
These data are measured in standard condition and it slightly differs depending on conditions.
Required Operating Force is the data by turning handle with both hands.
Caution
Full shut positio
n
Full open positio
n
Full shut positio
n
Full open positio
n
Full shut positio
n
Full open positio
n
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