OSYEX225-EN
Document is subject to change without notice.
NIPPON VALVE CONTROLS, INC.
1-21-19 Meieki minami, Nakamura-ku, Nagoya 450-0003 JAPAN
TEL: 81-52-582-6435 FAX: 81-52-582-6439
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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.
CHECKING
Check the product code before installation.
INSTALLATION
PRECAUTIONS
• Flush the pipeline carefully before installing the
valve. Foreign particles, such as sand or pieces of
welding electrode, will damage the ball and seats.
• For valves with specified flow direction (AE / EG) or
with ST / SC option, check the arrows on the product
before piping.
• When the flow path is subjected to a high pressure
from arrow, it may leak slightly to the low pressure
port. (TE / EL / TV)
PIPING
• Using a pipe with too long a thread will damage the
valve.
• If sealing tape or sealant gets inside the valve, the
valve seat leaks or malfunctions.
• To prevent the valve from being damaged by stress,
always hang a wrench on the end of the valve on the
side where the pipe is to be connected when
screwing in the pipe or when unscrewing it after
correcting the angle. (Fig a and b)
Do not apply excessive force to the valve with a pipe
wrench or the like.
• Refer to the recommended tightening torque table
and do not apply excessive torque.
Size [mm] Torque [Nm]
008 to 010 15 to 20
015 25 to 35
020 40 to 50
025 50 to 60
032 60 to 80
040 75 to 85
050 90 to 110
ENVIRONMENT
If there is a possibility that the fluid and drive part
freeze, please take measures to prevent freezing.
POSITIONING
Should be positioned through 90° upward from
horizontal. Provide space around the product to
allow manual operation, inspection and replacement
work.
MAINTENANCE
Do the routine maintenance at least once in half a
year.
Inspection items
• Confirm operation of opening and closing.
• Confirm the fluid temperature or pressure.
• Confirm the leak from valve stem.
TROUBLESHOOTING
Problem Cause Solution
Stop in the
mid position.
• Biting of
valve seat.
• The scale
has adhered
to the valve
ball.
Remove a foreign
object.
Leakage
from
valve body
• Valve cap
get loose.
• Valve body
is damaged.
Replace the valve.
Leakage
from
valve seat
Seat is worn
or damaged.
Leakage
from
valve stem
Stem packing
is worn or
distorted.
For more information contact
NIPPON VALVE CONTROLS, INC. for consultation.
a b
