Installation, Operation and Maintenance Manual
󲷇H-A058-E-12󲷈 Diaphragm Valve, True Union Diaphragm Valve (15-50mm, 1/2”-2”) Pneumatic Actuated Type AI
(2) General operating instructions
- Do not disassemble or modify the actuator.
(If disassembled under tension, internal parts may jump out and this is very dangerous.)
- 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 AV valves in place where they may become submerged water.
- 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
(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.)
- The travel stop may have to be adjusted if media leakage is detected between the upstream & downstream
sides of the valve.
- Bonnet bolt torque should be checked before installation, as they may become loose after long-term
storage. A periodic check of the valve condition as well as bonnet & flange bolt torque should be made
part of preventative maintenance program properly re-tightening the bolts as necessary. It is especially
important to re-tighten all bolts during the first shutdown.
- The actuator of diaphragm valve have draw and exhaust
vent. (The back side) The fluid might spout when the
diaphragm is damaged by the condition. Perform
periodic maintenance.
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