7-3. Disassembly and Reassembly of the Actuator
This section gives instructions on disassembly and reassembly of the actuator.
If you need to disassemble and reassemble the valve for periodic inspection, troubleshooting,
or other circumstances, refer to the instructions.
7-3-1. Disassembly of the actuator
Disassembly procedure
This section describes the procedure for disassembling the actuator.
Figure 7-5, Figure 7-6
(1) Marking and parts protection
Step Procedure
1 Place matching marks on the spring holder at the top of the actuator and lift stopper,
cylinder, and yoke boss for cylinder assembly.
2 Wrap plastic tape around the threads of the rod to protect the sealing parts and the
guide bushing.
(2) Removing the slide screw rotation lock
Step Procedure
1 Remove the hex bolt (No. 50) and hex nut (No. 51) that hold the slide screw rotation
lock (No. 49).
2 Remove the slide screw rotation lock (No. 49).
(3) Removing the spring holder
Step Procedure
1 Loosen and remove the hex nuts (No. 2) and eyenuts (No.1) at the top of the actuator.
2 Lift the spring holder (No. 17) straight up to remove it.
(4) Removing the lift stopper and spring unit
Step Procedure
1 Loosen and remove the long and short hex staybolts, Nos. 4 and 9 (two each) that con-
nect the lift stopper (No. 20) and the cylinder (No. 21).
2 Lift the lift stopper (No. 20) straight up to remove it.
3 Attach eyebolts to the screw holes (M12 × 2) of the spring flange (No. 59) at the top of
the spring unit, and lift the spring unit (about 120 kg) upward with a crane.
4 At this point, remove the tape liner (No. 7) and O-ring (No. 8) that seal the piston (No.
57).
7-5
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