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7.1 Daily inspection
Check the following items while the system is in operation.
• Corrosion or crack on the product
• Leakage from the product under normal working pressure (check it visually and aurally).
• Leakage from connection between the product and piping.
* Please contact us if any abnormal condition is observed.
7.2 Monthly inspection (once a month)
1.
Check that there is no loose piping at inlet and outlet sides of the product.
2.
Check that the operation of the product by making fluid pressure 75% or more of set pressure and
lifting the lever.
* Please contact us if any abnormal condition is observed.
7.3 Troubleshooting
Trouble
Fluid leakage at
outlet side can be
confirmed by
sound*.
* The product has allowable valve seat leakage and does not close completely (valve seat leakage cannot be
zero).
Cause
1. Scale stuck on contact surface
between valve [5] and valve seat
[4].
2. Damage on contact surface
between valve [5] and valve seat [4].
3. Excessive vibration is applied to
the product and leads to
malfunction.
4. Pressure difference between the
set pressure and the normal
working pressure is too small.
5. The pressure momentarily exceeds
the set pressure because of fluid
pulsation.
6. Fluid flows into the outlet piping.
1. Follow the procedure described in 7.2.2. and
start up the product to remove the scale.
If the trouble does not stop, please contact
us for repair at our factory.
2. The product needs to be disassembled
and its parts need to be replaced.
Please contact us for repair at our factory.
3. The product cannot be used on device or
equipment that vibrates excessively.
4. The pressure difference needs to be
enlarged. To readjust the set pressure, the
product is readjusted at our factory.
5. In view of fluid pulsation, the set pressure
needs to be raised (readjusted) or the
normal working pressure needs to be
lowered. To readjust the set pressure, the
product is readjusted at our factory.
6. Change the piping layout to keep the fluid
from flowing into the outlet piping.
7
Remedy
■EPDT-241■
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