ASAHI AV VALVES Installation, Operation and Maintenance Manual
Butterfly Valve Type 57, 56, 56D Electric Actuated Type S 11
(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.)
- The installed valve must never be opened or closed when foreign matter such as sand is present
in the pipeline.
- 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
- 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.
Connected flange or pipe
Interference of the Disc