VPro MA Series User manual

OSYWT225-EN
1/5
Instruction manual
MA
-
SERIES
Butterfly Damper
WT
SP-1474
Please read this manual before installation and use.
GENERAL
Damper body and Disc made by precision processing
ensure reduced leakage from damper seat.
This series can be used at fluid temperatures ranging from -
40 °C to 550 °C.
Manual operation
Lever
Gear
Damper
WT : For Wafer (JIS 5K)
PRODUCT CODE
WT type (Without seat) M A - W T - 2 T G 0 - -
(With SUS316 seat) M A - W T - 2 T G S - -
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
(1) Actuator
MA-
(2) Damper
WT
(3) Manual operation
L : Lever
G : Gear
(4) Sizing code
- : Hyphen
(5) Connection
2 : JIS 5K
(6) Body material
T : SCS13A
(7) Packing material
G : Expansion graphite
(8) Seat material
0 : (Zero) None
S : SUS316
(9) Size [mm]
ex. 80 A ® 080
(10) Option
XM : Heat insulation

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DAMPER SPECIFICATIONS
Water Oil Air, Gas Steam Chemicals Sea water Slurry Negative pressure
Damper type WT (Without seat) WT (With SUS316 seat)
Design 2-way, Wafer 2-way, Wafer
Connection JIS Flanges 5K JIS Flanges 5K
Fluid
Max pressure 20 kPa 20 kPa
Size [mm] 040 to 250 300 to 400 040 to 400
Material Body SCS13A SCS13A
Disc SUS420J2 SUS420J1 SUS410S / SUS420J2
Seat None SUS316
Stem seal Packing Expansion graphite Expansion graphite
PRESSURE & TEMPERATURE RATING
Temperature range : -40 to 600 °C
SEAT LEAKAGE VOLUME
Damper size [mm] Remarks
WT-2TG0 (Without seat) 040 to 050 Less than 2 % of rated Cv.
065 to 400 Less than 1 % of rated Cv.
WT-2TGS (With SUS316 seat) 040 Less than 1 % of rated Cv.
050 Less than 0.5 % of rated Cv.
065 Less than 0.2 % of rated Cv.
080 to 400 Less than 0.1 % of rated Cv.
INHERENT FLOW CHARACTERISTIC
Cv value (%)
D
amper
opening (%)
Range ability 50:1
Max

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INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
MANUAL LEVER DIMENSIONS
Damper size [mm] Lever [mm] Hex bolt
WT L H A
040
050
065
080
100
125
115 36 9 M5×15
150
200
250
145 46 11 M5×15
300 220 52 14 M6×15
350
400 320 55 17 M8×15
GEAR DIMENSIONS
Damper size [mm] Gear handle [mm] Actuator
WT K
040
050
065
080
100
125
150
200
250
300
350
400
150 MAG-F07
HANDLING OF MANUAL LEVER
• The lever handle is removed and shipped.
• The lever mounting direction can be changed in units
of 45 degrees.
• Do not apply excessive torque to the lever.
• Do not strike or extend the lever with a tool.
HANDLING OF GEAR
• The handle wheel of the gear is removed and
shipped.
• Insert the handle into the gear shaft.
• Insert a pin into the hole in the handle.
L
H
A
φK
OPEN SHUT
Handle
Pin
Butterflynut
BoltLever
Stem
OPEN/SHUT
indicator

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INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
HANDLING & STORAGE
HANDLING
Do not drop or throw the product as it may break.
STORAGE
Store away from dust, moisture and direct sunlight.
If possible, store in the original package.
CHECKING
• Check the product code before installation.
• Make sure that the bolts are not loose.
HANDLING OF MANUAL OPERATION
• Be careful about temperature of a lever / handle part,
when using it for the fluid of the high temperature or
low.
• Avoid the operation with bare hands, and make a
protective measure.
• For manual operation, loosen the butterfly nut before
operating. After operation, tighten the butterfly nut to
secure the position.
INSTALLATION
PRECAUTIONS
• Flush the pipeline carefully before installing the
damper. Foreign particles, such as sand or pieces of
welding electrode, will damage the disk and seats.
• For dampers with specified flow direction (WT),
check the arrows on the product before piping.
• Damper is shipped closed. (allows quick piping.)
• Disc interference may also occur when damper 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
• 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 damper is put between two
seats of flanged-end and tightened with long bolts.
• Before bolts are tightened, damper 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.
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.
INSULATION WORK
• For maintenance of gland packing, insulation should
be below the ground part.
• The upper part of the ground plate part is a heat
dissipation part, do not insulate it.
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
Damper size [mm] Torque [Nm]
WT
040
050
065
1
080
100
125
2
150
200
250
300
5
350
400 8
MAINTENANCE
Do the routine maintenance at least once in half a
year.
Inspection items
• Confirm operation of opening and closing.
• Confirm whether screws are loose or not.
• Confirm the fluid temperature or pressure.
• Confirm the leak from damper stem.
• Confirm the bolt tightening torque.
Gland nut
Gland plate
Stem

OSYWT225-EN
Document is subject to change without notice.
NIPPON VALVE CONTROLS, INC.
1-21-19 Meieki minami, Nakamura-ku, Nagoya 450-0003 JAPAN
TEL: [phone] FAX: [phone]
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INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
TROUBLESHOOTING
Problem Cause Solution
Stop in the
mid position.
There is a
foreign object
in the damper.
Remove a foreign
object.
Damper is
distorted.
Replace the damper.
Leakage
from
damper
gland
Gland packing
is worn or
distorted.
Tighten the gland nut.
Replace the gland
packing.
For more information contact
NIPPON VALVE CONTROLS, INC. for consultation.