ASAHI AV VALVES Installation, Operation and Maintenance Manual
Butterfly Valve Type 57, 56, 56D Electric Actuated Type S 12
In case of the thick wall of the connection part (flange and pipe) is too thick, shave the flange or the pipe inside in order to
avoid the contact of pipe and disc. If inside diameter of the connection part is larger than size D, shaving is not necessity.
Unit: mm (inch)
Nominal size Diameter D
40 (1 1/2”) 31 (1.22”)
50 (2”) 43 (1.69”)
65 (2 1/2”) 57 (2.25”)
80 (3”) 67 (2.64”)
100 (4”) 91 (3.59”)
125 (5”) 115 (4.53”)
150 (6”) 137 (5.40”)
200 (8”) 179 (7.05”)
250 (10”) 231 (9.10”)
300 (12”) 280 (11.03”)
350 (14”) 333 (13.12”)
400 (16”) 370 (14.57”)
Torque wrench Spanner wrench
Bolt, Nut, Washer (For many flanges specification)
Procedure
1) Leave the valve slightly opened by manual handle. (Refer to page17)
* Don’t make the disc protrude from the seat.
(If not, the disc may be hurt.)
2) Set the valve to piping system.
3) Insert washers and bolts from the pipe side, insert washers and nuts from the
valve side, then temporarily tighten them by hand.
4) Using a torque wrench, tighten the bolts and nuts gradually to the specified
torque in a diagonal manner (Refer to fig.1)
* Avoid excessive tightening. (The valve can be damaged.)
Necessary items
Manual Han󲿧l󲿨
Actuator type: SRJ
Actuator type: LTRM
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