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6
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EPDT-002g
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6. Maintenance
6.1 Troubleshooting
Trouble
Cause
Remedy
Fluid does not flow.
1.
Screen [22] is clogged.
2.
Stop valve at inlet and outlet are
shut-off.
1.
Disassemble and clean the screen [22].
2.
Open the stop valve.
3.
Installation direction is wrong.
3.
Confirm the arrow on the product and
install it correctly.
Pressure
loss
is
excessive
1.
Screen [22] is clogged.
2.
Pressure gauge is damaged.
3.
The nominal size is too small for
the actual flow rate.
1.
Disassemble and clean the screen [22].
2.
Replace pressure gauge.
3.
Use strainer with larger nominal size.
［
Figure 1
］
［
Pressure Loss chart
］
Foreign substance is
not removed
1.
Screen [22] is damaged.
1. Disassemble the strainer and change the
screen [22]. In case on-off valve are installed at
either end of the strainer, do not open the valve
immediately since this may result in damage of
the water hammer.
Cover [21] cannot be
removed
upon
changing screen.
1.
The inside of the product is
vacuum.
1. Break the vacuum inside the pipe and
remove cover [21].
Leakage at outside
1.
Gasket, O-ring [24] is damaged.
2.
U-packing [7] is damaged.
1. Replace the gasket and O-ring to new one.
2. The product need to be disassembled and
its part need to be replaced. Please contact us.
6.2 Warning and caution upon inspection
If the strainer is clogged with foreign substances or scale, the fluid passage area will decrease and the fluid
will not flow smoothly. Then it causes damage to the screen and affects the piping system.
Warning
1. Prior to carrying out the maintenance and inspection, make sure that the pressure inside of the strainer
or piping system decrease to the atmospheric pressure. Also, in case the high temperature of fluid is
applied, leave the system cooled down until you can handle them.
*Remaining internal pressure will cause injury or scald.
1.
When cleaning the screen, check the direction and make sure that fluid is not passing. Open the cap which
the fluid is not passing through, remove the screen, and clean with compressed air and cleaning detergent.
*Do not remove the screen by force when screen is stuck on screen case due to scale and rust. (Screen
handle might be damaged).
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