Installation, Operation and Maintenance Manual
Diaphragm Valves Type 15 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.)
-
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.
Nom. Size
mm (inch)
Bonnet tightening
torque value
Nm {kgfcm} [lbinch]
Rubber PTEF
125 (5)
45.0
{459}
[400]
45.0
{459}
[400]
150 (6)
45.0
{459}
[400]
45.0
{459}
[400]
Warning
Caution
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