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8.3 Periodic replacement of parts
Caution
8.4 Troubleshooting
Trouble
1. Strainer installed at the inlet side of the
The valve
product is clogged.
does not
2. Plunger a'ssy is stuck with foreign
open.
substances in the piping.
(Fluid does
3. The pilot port gets stuck with foreign
not flow.)
substances.
4. Fluid pressure exceeds the specified
working pressure.
5. Fluid viscosity exceeds 20 cSt.
6. No electric conduction (trouble with
electric circuit).
7. Wires of coil not bound proper for the
applied voltage.
8. Voltage fluctuates widely.
9. Coil specifications do not match with the
applied voltage.
10. Coil burned out with abnormal
temperature rise caused by use in high
ambient temperature condition or in
insulated condition, etc.
11. Coil burned out due to excess current.
1. Plunger a'ssy or the diaphragm is stuck
The valve
with foreign substances or get damaged.
does not
close.
2. Plunger a'ssy is stuck with foreign
(Fluid flow
substances in the piping.
does not
stop.)
3. Inlet/outlet of the product is installed in
the opposite direction of the fluid flow.
4. Bypass stop valve is kept open.
5. The differential pressure is less than 0.1
MPa when the coil is set sideways.
6. The bleed port (on the body) is
obstructed.
7. The spring pin (on the cover) is
obstructed.
8. Electricity is kept conducted.
1. There is a constricted part of piping just
The
in front of the inlet of the product.
product
2. Gas is commingled in the liquid.
vibrates.
(When the applied fluid is liquid.)
Replace the following parts when the time below comes in order to maintain the
optimal performance of the product.
For replacement parts, replacement time differs according to frequency or condition
of use. Standard times for replacement are shown in the table below.
Part replacement
Part
Diaphragm complete set*
Coil
* marked parts are replaced as diaphragm complete set.
Cause
Time for replacement
Per 150,000 actuations
Per 4 years
1. Clean the strainer.
2. Disassemble the product and remove foreign
substances. Make sure that the sliding action
is smooth.
3. Replace the diaphragm complete set with a
new one.
4. Adjust the fluid pressure to the appropriate
level.
5. Adjust the fluid viscosity to the appropriate
level.
6. Check the power supply and voltage.
7. Wire the coil properly for the applied voltage.
If the trouble still exists, replace the coil with a
new one.
8. Adjust the electric circuit to regulate the
voltage within the allowable fluctuation.
9. Replace the coil with a new one proper for
the applied voltage.
10. Use the product in ambient temperature lower
than that indicated in "2. Specifications."
Additionally, do not insulate the coil. Under
such condition, replace the coil with a new one.
11. Replace the coil. Make sure that the applied
voltage is within the allowed range of voltage
fluctuation.
1. Disassemble the product and remove foreign
substances.
Replace the diaphragm complete set with a
new one if any damage is observed.
2. Disassemble the product and remove foreign
substances. Make sure that the sliding action
is smooth.
3. Reinstall the product correctly.
4. Close the bypass stop valve.
5. Adjust the differential pressure to be 0.1 MPa
or more. If the minimum differential pressure
is not obtained, install the product to a
horizontal piping with the coil faced upward.
6. See 3 in "8.6 Reassembly" on Page 15.
7. Replace the cover complete set with a new
one.
8. Check the power supply.
1. See 19 and 20 in 6.3 "Precaution for
installation" on Page 10.
2. Avoid commingling of gas.
14
Remedy
■ EPDT-266c ■
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