(3) Attaching the accessories
Attach the accessories in their original position.
(4) Inspection after reassembly
•
Send the specified control signals and air pressure to the positioner or the actuator. Check
the air pipes and their joints for leakage.
•
Change the control signal to check if the valve operates properly in accordance with the
signal.
•
Check seat leakage to confirm that the performance meets the specification.
•
Carry out a pressure shell test for the valve body to confirm that fluid does not leak from
between the valve and bonnet and from the gland.
•
For models with a handwheel, turn the handwheel to check that the valve opens and closes
smoothly. Then, turn the handwheel so that the pointer indicates AUTO, and check that
the valve opens and closes smoothly in accordance with input signals.
6-4. Removing the Side Handwheel from the Actuator
Removal procedure
Check the size of the actuator and disassemble the side handwheel from the actuator, referring
to
Figure 6-15.
(1) Before disassembly
Check that the pointer on the side handwheel main unit is in the AUTO position.
(2) Removal from the actuator stem
Loosen the bolts and nuts that hold the levers. Remove the levers from the boss of the
connector.
(3) Removing the side handwheel from the actuator
Remove the bolts that connect the yoke to the side handwheel main unit, and remove the
side handwheel from the actuator.
6-13
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