ASAHI AV VALVES Installation, Operation and Maintenance Manual
Butterfly Valve Type 57, 56, 56D Electric Actuated Type S 20
Disassembly procedure
1) Completely discharge fluid from pipes.
2) Fully close the valve by the motor-driven operation or manual
operation.
3) Turn off the power source.
4) Leave the valve slightly opened with a Manual handle. (Refer to
page 17)
5) Loosen the insert bolts and remove them.
6) Remove the body part from piping system.
7) Loosen the bolt (K)[39] or boltnut (P) [39], and remove the actuator.
8) <Nominal size 40-350mm (1 1/2”-14”)>
Remove the stem retainer (A) [8] with screwdriver (+).
9) <Nominal size 40-100mm (1 1/2”-4”)>
Pull out the stem [7] by hand or pliers.
<Nominal size 125-400mm (5”-16”)>
Attach jack, thrust bearing, plate, and pipe to the valve, and thrust the
jack into the stem [7].
Turn the handle of jack to pull out the stem [7].
10) Make the disc [2] fully open.
11) Insert the screw driver (-) between body [1] and seat [3]. Disc [2]
and seat [3] are extruded by using screw driver (-).
12) <Nominal size 40-350mm (1 1/2”-14”)>
Remove the disc [2], seat bush A [183] and seat bush B [184] from
the seat [3].
<Nominal size 400mm (16”)>
Remove the disc [2] from the seat (3)
Assembly Procedure
- Nominal size: 40-350mm (1 1/2”-14”)
1) Before starting assembly, grease (Silicone) should be spread on the O-ring
(C) [6] and O-ring (I) [185].
2) Put the O-ring (C) [6] onto the stem [7]. Put the O-ring (I) [185] onto the
stem bush A [183] and B [184].
3) Grease (Silicone) should be spread on the top and bottom disc [2], the
stem of the seat [3].
4) Put the disc [2], seat bush A [183] and seat bush B [184] onto the seat [3].
“The set of seat - disc” call for combined parts.
5) Put it into the state of open the valve slightly. Insert the set of seat - disc
[3] into the body [1].
Actuator type: SRJ
Actuator type: LTRM, LTMD, LTRH
Manual handle
Position A
Position B
Change lever
Body 󲘀ea󲘡 󲗯󲘢󲘠󲘕 󲗮
󲘀ea󲘡 󲗯󲘢󲘠󲘕 󲗯
Disc
Seat
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