Installation, Operation and Maintenance Manual
【
H-A077-E-00
】
3-Way Ball valve Type 23 Electric actuated Type Z 15
～
50mm (½”-2”)
28
16.
Inspection items
Portion to be
inspected
Inspection items
Routine inspection
Periodic inspection
Actuator
- Existence of rust and corrosion on the
appearance.
-Tightening condition of respective
threaded portions. (Loose or not)]
- Existence of rust and corrosion around
the limit switch, and existence of
internal disconnection.
- Existence of rust and corrosion of
terminal board, and existence of
disconnection.
- Existence of abnormality in opening
and closing operating sounds.
- Measurement of insulation resistance
(megger test etc.).
- Measurement of contact resistance
(tester, etc.).
- Presence or absence of disconnection
of internal wiring.
- Presence or absence of disconnection
of external connection.
- Smooth manual operation.
-The screw of the terminal block is
tightened.
Valve
Routine inspection
- Existence of scratches, cracks, deformation, and discoloring.
- Existence of leakage from the valve to the outside.
- Existence of leakage when the right closed or left closed.
17. Troubleshooting
Problem
Cause
Treatment
The Allen wrench
does not turn or
cannot turn
during manual
operation.
The built-in stopper (left open side or
right open side) of the actuator is
functioning.
Rotate the Allen wrench in the opposite
direction.
The Auto/Manual changeover switch is
set to automatic operation (A).
Switch the Auto/Manual changeover
switch to manual operation (M). (Refer
to "
11. Operating procedure
".)
Foreign matter is in the valve.
Remove foreign matter.
Valve torque is increasing due to piping
stress.
Remove the piping stress.
Due to the influence of fluid
(temperature, composition, pressure),
the torque of the valve is increasing.
Check the service condition.
It is not output
when the signal
from the limit
switch is fully
open or fully
closed.
The contact between the limit switch and
the cam is defective.
Remove the signal line connected to the
terminal block and check the resistance
value with a tester or the like.
(Guide: Resistance 0.5
Ω
or less when
the contact is ON)
The limit switch is out of order.
(Poor contact: wear, corrosion, etc.)
Replace the actuator.
- Perform periodic maintenance. (Leakage may develop due to temperature changes or over
periods of prolonged storage, rest or operation.)
