Installation, Operation and Maintenance Manual
Butterfly Valves Type 56, 75, 56D, 75D 12
(6) Specification of limit switch (option)
Nominal Size Type Type Code Protection Grade
400mm (16”) Gear Type TA-200-SB2 IP55
Limit Switch Rating Connection Diagram
(At intermediate opening)
Type Code Rate Voltage
AC125 11 7
AC250 11 7
DC125 0.5 0.1
DC250 0.25 0.04
(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.)
- When installing pipes and valves, ensure that they are not subjected to tension, compression, bending,
impact, or other excessive stress.
- 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.)
- 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.