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Trouble
Blows at pressure
lower than the set
pressure.
Does not operate
at the set pressure.
Does not stop blowing.
Cause
1. Product specifications are not
consistent with usage condition.
2. Pressure gauge is out of order.
3. The product does not keep the
accuracy of its set pressure.
1. Product specifications are not
consistent with usage condition.
2. Pressure gauge is out of order.
3. Sliding portions of the valve [5] and
valve seat [4] does not move
smoothly
4. There is a back pressure at the
piping of the product outlet.
5. The product does not keep the
accuracy of its set pressure.
1. Scale stuck on contact surface
between valve [5] and valve seat
[4].
2. Sliding portions of the valve [5] and
valve seat [4] does not move
smoothly.
3. The normal working pressure
exceeds the closing pressure.
4. The product is installed at outlet
side of the pressure reducing
valve which is out of order, and the
reduced pressure of the valve is
getting higher than expected.
1. Check the set pressure indication on the
name plate [20]. If the product is not
suitable for the usage condition, replace it
with a proper one.
2. Calibrate the pressure gauge or replace it
with a new one.
3. The set pressure needs to be readjusted.
Please contact us for repair at our factory.
1. Check the set pressure indication on the
name plate [20]. If the product is not
suitable for the usage condition, replace it
with a proper one.
2. Calibrate the pressure gauge or replace it
with a new one.
3. The product needs to be disassembled
and cleaned. Please contact us.
4. Remove the back pressure. In addition,
change the piping layout not to allow
back pressure.
5. Please contact us for repair at our factory.
1. Follow the procedure described in 7.2.2. and
start up the product to remove the scale.
Please contact us for repair at our factory if
the trouble does not stop.
2. The product needs to be disassembled
and cleaned. Please contact us for repair
at our factory.
3. Increase the difference between the
set pressure and normal working
pressure. To readjust the set pressure,
the product is readjusted at our factory.
4. The pressure reducing valve needs to be
repaired. If it is Yoshitake product, please
contact us.
8
Remedy
■EPDT-241■
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