OSPDN20A-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
8/8
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
TROUBLESHOOTING
Problem
Cause
Solution
Fail to
operate.
Air doesn't
come out.
Supply air.
Air pressure is
too low.
Adjust to standard
pressure level.
Stop in the
mid position.
There is a
foreign object
in the butterfly
valve.
Remove a foreign
object.
Valve is
distorted.
Replace the valve.
Leakage
from
valve seat
Damaged on
valve seat.
Replace the valve.
Replace the valve seat.
Leakage
from
valve stem
Gland packing
is worn or
distorted.
Tighten the gland nut.
Replace the gland
packing.
For more information contact
NIPPON VALVE CONTROLS, INC. for consultation.
