Installation, Operation and Maintenance Manual
Butterfly Valves Type 56, 75, 56D, 75D 2
(2) General Operating Instructions
- Using a positive-pressure gas with our plastic piping may pose a dangerous condition due to the repellent
force particular to compressible fluids even when the gas is under similar pressures used for liquids.
Therefore, be sure to take the necessary safety precautions such as covering the piping with protective
material. For inquiries, please contact us. For conducting a leak test on newly installed piping, be
sure to check for leaks under water pressure. If absolutely necessary to use a gas in testing, please
consult your nearest service station beforehand.
- Do not step on or apply excessive weight on valve. (It can be damaged.)
- Do not use the valve in conditions where the fluid may have crystallized.
(The valve will not operate properly.)
- Keep the valve away from excessive heat or fire. (It can be damaged, or destroyed.)
- Always operate the valve within the pressure vs. temperature range.
(The valve can be damaged or deformed by operating beyond the allowable range.)
- Allow sufficient space for maintenance and inspection.
- Select a valve material that is compatible with the media. For chemical resistance information, refer to
“CHEMICAL RESISTANCE ON ASAHI AV VALVE”.
(Some chemicals may damage incompatible valve materials.)
- Keep the valve out of direct sunlight, water and dust. Use cover to shield the valve.
(The valve will not operate properly.)
- Perform periodic maintenance.
(Leakage may develop due to temperature changes or periods of prolonged storage, rest, or operation.)
- Gear Operator Operation; we utilize a self-locking worm
gear design on our manual operators. This design
allows flow control of the valve in intermediate
positions in normal process conditions. In
applications where very high velocity, turbulence flow
or vibration is present and an intermediate setting is
required, it is recommended to install a locking device.
The locking device will prevent the possibility of the
valve drifting in severe condition form it is original
intermediate setting.
Warning
Caution
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