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1. Before applying higher pressure fluid to the product, check that no problems have occurred in the
equipment on the piping.
* Failure to follow this notice may damage the equipment.
2. Completely discharge fluid from the product and piping before leaving the product not operated for a long
time.
* Failure to follow this notice may cause foreign substances and scale inside of the piping and may result
in malfunction of the product.
3. If the product is not operated for a long time, perform test working before starting operation.
8.1 Daily inspection
Check the following items while the system is in operation.
• Leakage from between the cap [13] and the O ring [22]. (AL-140TML, AL-150TML, AL-150TR)
• Corrosion or crack on the product
• Leakage from the product under normal working pressure (check it visually and aurally).
• Leakage from the joint between the product and piping, and between the spring case and the valve
seat.
* Please contact us if any abnormal condition is observed.
8.2 Regular inspection (once per 6 months)
1.
Check that there is no loose piping at inlet and outlet side of the product. In addition, check that the
cap [13] is fastened securely.
2.
Check the operation of the product by raising fluid pressure to the set pressure.
For the AL-150TML and the AL-140TML (closed type with a lever), check the operation, by lifting up
the lever, while differential pressure between the set and inlet pressures is within the range of table 1.
* Please contact us if any abnormal condition is observed.
Table 1. The differential Pressure in which the blow-off inspection by lever operation is possible
8.3 Troubleshooting
Trouble
Leakage detected
at the outlet
Blows at a pressure
lower than the set
pressure.
Size
Differential pressure between set and inlet pressures
15-25A
32-40A
50A
Cause
1. Foreign substance or scale stuck
on contact surface between the
valve [3] and valve seat [2].
2. Damage on the O ring [5] or on the
contact surface of valve seat [2].
3. Excessive vibration applied to the
piping where the product is installed.
4. The 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. The product specifications are not
consistent with the use condition.
2. The pressure gauge is out of
order.
Caution
1.0 MPa or less
0.6 MPa or less
0.4 MPa or less
1. Follow the procedure described in 8.2.2. to
operate the product and eliminate the foreign
substance and scale.
Please contact us if the trouble does not stop.
2. The product needs to be disassembled
and its parts need to be replaced.
Please contact us.
3. The product should not be used on device
or equipment that vibrates excessively.
4. The set pressure needs to be readjusted.
For AL-150TR, readjust the set pressure
by handle (See 8.4). For the other models,
please contact us.
5. In view of fluid pulsation, the set pressure
needs to be raised (readjusted) or the
normal working pressure needs to be
lowered.
pressure, please contact us.
6. Change the piping layout to keep the fluid
from flowing into the outlet piping.
1. Check the set pressure indication on the
name plate. 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.
7
Remedy
To raise (readjust) the set
E PDT-193d
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