OSPDN20A-EN
6/8
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
HANDLING & STORAGE
HANDLING
Proper care in handling the valve should be taken to
prevent damage. Do not drop or throw it.
STORAGE
• Store the valve in the protected area from dust,
moisture, and direct sunlight.
If possible, should be kept in the original packaging.
• Do not remove a dust proof cap until the piping.
CHECKING
• Check the product code before installation.
• Confirm that there is no screw loose or part
deformation.
INSTALLATION
PRECAUTIONS
• Before installing, clean pipe and valve ends. Make
sure they are free of dirt, dust and etc.
• DN valve is shipped closed. (TACDN is closed with a
manual unit. Without a manual is open.)
• The butterfly valve should be piped upstream of the
elbow. When piping downstream from the elbow,
considered a straight line that is at least five times the
length of the pipe.
• The valve stem should be mounted perpendicular to
the flow for biased fluid.
• Disc interference may also occur when valve is
installed in pipeline with smaller than normal inside
diameter such as thick wall pipe, or lining pipe.
Suitable corrective measurement must be taken
(taper boring the pipe or pipe liner, etc.)
PIPING FLANGES
• DN valve has a flow direction. Install the valve
accordingly.
• Gasket should be selected appropriately to suit the
fluid, pressure and temperature. Use spring washer to
prevent from decreasing surface pressure gasket
when the temperature change happens frequently.
• Wafer type butterfly valve is put between two seats of
flanged-end and tightened with long bolts.
• Before bolts are tightened, valve should be centered
within the bolts to prevent possible disc interference or
damage by contact with the pipe or flange.
• Tighten all bolts using crossover method to load the
joint evenly.
• If a plastic flange used, do not over-tighten the bolts,
as this may deform the flange and cause leakage.
ENVIRONMENT
• Do not install in place where corrosive gas is present
or where vibration is heavy (0.5 G or more).
• When radiant heat causes the surface temperature of
the control unit to exceed 50 °C, provide an
appropriate shielding plate.
• If there is a possibility that the fluid and drive part
freeze, please take measures to prevent freezing.
• For single-acting type, prevent water and dust from
coming into air exit.
POSITIONING
Should be positioned through 90° upward from
horizontal. Provide space around the product to allow
manual operation, inspection and replacement work.
CAUTIONS FOR MAINTENANCE
Do not keep warm for maintenance of the valve gland.
TIGHTEN THE GLAND NUTS
• Check that there is no leakage from the gland
packing.
• If it leakage, tighten gland nuts by alternately.
Do not over-tighten the gland nuts.
Recommended torques [Nm]
Valve size [mm] Torque
080 3.5
100 to 150 7
200 to 300 14
Fast
Slow
Fast
Slow
Gland nut
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