Installation, Operation and Maintenance Manual
Butterfly Valves Type 75, 75D Electric Actuated Type S 8
(7) Installation procedure
- When suspending and supporting a valve, take care and do not stand under a suspended valve.
- Be sure to conduct a safety check on all hand and power tools to be used before beginning work.
- Wear protective gloves and safety goggles as fluid remain in the valve even if the pipeline is empty.
(You may be injured.)
- When installing a pipe support by means of a U-band or something similar, take care not to over-tighten.
(Excessive force may damage the pipe.)
- Do not install the valve with the disc fully closed. (The disc may pinch into the seat, resulting in a high
operating torque and preventing the valve from operating properly.)
- When installing pipes and valves, ensure that they are not subjected to tension, compression, bending,
impact, or other excessive stress.
- Use flat faced flanges for connection to AV Valves.
- Ensure that the mating flanges are of the same standards.
- The gasket is unnecessary.
(The seat carries out the role of the gasket.)
- The valve disc is in the position indicated by solid lines in
figure to the right prior to shipment from the factory. If the
valve is opened or closed after unpacking, it must be reset in
this position before installation. Failure to do so will result
in damage to the surface of the valve seat during handling
and installation.
- Care must be used during piping installation to ensure that the pipes or flanges are properly aligned so
that the valve disc does not contact them in any setting. Misalignment as in figure below will result in
damage to the valve.
In the case of thick of the connection part (flange and pipe) is too thick the flange or the pipe inside order to avoid the
contact of pipe and disk. If inside diameter of the connection part is larger than size D, shaving is not necessity.
Unit: mm (inch)
Nominal size Diameter D
450 (18”) 422 (16.61”)
500 (20”) 472 (18.58”)
600 (24”) 572 (22.52”)
Interference of the Disc
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