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9.1 Precaution for maintenance
Disassembling and inspections must be performed by a professional or a valve manufacturer.
1. Confirm that no power is supplied before disassembling or maintenance.
* Failure to do so may cause an electric shock.
2. Completely discharge the pressure inside of the product, line and equipment before disassembling or
maintenance and cool down the product till it can be touched with bare hands in the case of
high-temperature fluid.
* Failure to do so may result in injury or burns due to residual pressure.
3. Do not supply electric power to the coil while it is detached from the valve.
* Doing so may result in coil burnout or fire due to an overcurrent.
1. Conduct daily/periodic inspections in order to maintain the optimal performance of the product.
2. Be careful not to drop the product at the time of disassembling, and put the disassembled parts on
soft cloth to avoid scratch and damage.
* Damage on the product or parts may cause malfunction and affect the optimal performance.
3. When replacing parts, make sure the replacement parts are supplied by Yoshitake. And do not
make any alteration to the product.
* Using any part supplied by other than Yoshitake or making any alteration may cause damage to
the product or may result in injury or scalds due to blow-off or malfunction.
4. In the event of failure, close the stop valves and turn off the power before inspection.
5. When any defect is found on the product during the daily/periodic inspections, be sure to contact a
professional and follow its instructions.
6. Be sure to replace the gasket with new one at the time of re-assembling.
* Failure to do so may result in external leakage.
7. After disassembling and re-assembling, perform test working before starting operation again.
8. While disassembling, the fluid leaks from inside of the product. Set a container to collect the fluid.
Completely discharge the fluid inside of the product prior to disassembly.
9.2 Daily and periodic inspections
Conduct daily and periodic inspection/replacement in order to maintain the optimal performance of
the product.
Daily inspection (to be conducted once every operational day.)
Item
Working
conditions
External
leakage
Periodic inspection (to be conducted once every year.)
Item
Seal seat
surfaces of the
body
Seal seat
surface and
sliding surface
of the plunger
How to inspect
Check that the valve
opens when switched
on, and closes when
switched off, using a
pressure gauge.
Inspect the product
visually.
How to inspect
Disassemble the product
and visually inspect
these parts.
Disassemble the product
and visually inspect
these parts.
Warning
Caution
Trouble and remedy
The valve does not
open.
(Fluid does not flow.)
The valve does not
close.
(Fluid flow does not stop.)
See "9.3 Troubleshooting."
Trouble and remedy
If seal seat surface of the body is damaged, replace
the product.
If seal seat surface or sliding surface is damaged,
replace the plunger a'ssy.
10
See "9.3 Troubleshooting."
■EPDT-251b■
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