●
Flange shape
Use a flange which can secure a large contacting area with a gasket.
Good example
Flange
Welded
portion
Pipe
Welded
portion
gasket
Bad example
(As the contacting
area with a gasket is
small, there is a fear of
leakage.)
●
Flange connection
Tighten the flange with bolts.
Tightening torque differs by pipe size. Tighten at a torque that is within the range
specified in the table below.
Pipe size
Torque [Unit : N·m (kgf·cm)]
50A
37 to 47 (378 to 480)
80A
26 to 36 (265 to 367)
100A
32 to 42 (327 to 429)
150A
64 to 74 (653 to 755)
(The value in parentheses indicates the reference value.)
Handling precautions
•
Tighten bolts so that they are uniformly tightened. If leakage does not
stop after tightening bolts, gradually tighten the bolts more a little at a
time.
•
Tighten bolts within the specified tightening torque.
Otherwise, the bolts may be damaged.
•
Do not forcibly insert into the narrow space between the flange faces.
Doing so might cause leakage or damage.
•
Six of the 8 bolts on MVF080/100/150 models require the use of a spacer
to ensure that the are correctly aligned around the pipe connection unit
(wafer) and that they match up properly with the holes in the pipe flanges.
●
Diameter of gasket
A gasket is required for flange connection.
Refer to the table below for the inside diameter of gasket.
Pipe size
Inside diameter of gasket (Reference value)
50A
61 mm
80A
90 mm
100A
115 mm
150A
167 mm
Handling precautions
•
If the inside diameter of the gasket is too small, it might disturb the flow
straightening condition inside of this device and cause inaccuracies.
•
If the inside diameter is too large, it might cause leakage.
11
Chapter 3. INSTALLATION, MOUNTING, WIRING
