■
EPDT-193d
■
7
Caution
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
Size
Differential pressure between set and inlet pressures
15-25A
1.0 MPa or less
32-40A
0.6 MPa or less
50A
0.4 MPa or less
8.3 Troubleshooting
Trouble
Cause
Remedy
Leakage detected
at the outlet
1. Foreign substance or scale stuck
on contact surface between the
valve [3] and valve seat [2].
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. Damage on the O ring [5] or on the
contact surface of valve seat [2].
2. The product needs to be disassembled
and its parts need to be replaced.
Please contact us.
3. Excessive vibration applied to the
piping where the product is installed.
3. The product should not be used on device
or equipment that vibrates excessively.
4. The pressure difference between the
set pressure and the normal working
pressure is too small.
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. The pressure momentarily exceeds
the set pressure because of fluid
pulsation.
5. In view of fluid pulsation, the set pressure
needs to be raised (readjusted) or the
normal working pressure needs to be
lowered. To raise (readjust) the set
pressure, please contact us.
6. Fluid flows into the outlet piping.
6. Change the piping layout to keep the fluid
from flowing into the outlet piping.
Blows at a pressure
lower than the set
pressure.
1. The product specifications are not
consistent with the use condition.
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. The pressure gauge is out of
order.
2. Calibrate the pressure gauge or replace it
with a new one.
