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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 in order to avoid scratch and damage.
* Failure to follow this notice may prevent the product from functioning properly.
3. When repairing, do not use the parts other than the dedicated parts manufactured by Yoshitake. Do
not modify the product.
* Failure to follow this notice may cause damage to the product, or may result in scalds or injury due
to blow-off or malfunction.
4. In the event of troubles, close the stop valves and turn off the power before inspection.
* Failure to follow this notice may result in bodily injury.
5. If any defect is found on the product during the daily/periodic inspections, be sure to contact the local
distributer and follow its instructions.
6. Be sure to replace the gasket with new one at the time of reassembly of the product.
* Failure to follow this notice may cause leakage of the fluid.
7. After 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. When reassembling, connect all the parts securely. Tighten the bolts uniformly in diagonal positions
to prevent uneven tightening.
8.1 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
Check that the valve
conditions
opens when switched
on, and closes when
switched off.
Outside
Inspect the product
leakage
visually.
Periodic inspection (to be conducted once every year.)
Item
Seal seat
Disassemble the product
surfaces of the
and visually inspect the
body and the
parts.
valve element
Seal seat
Disassemble the product
surface and
and visually inspect the
sliding surface
parts.
of the plunger
Sliding
Disassemble the product
movement of
and inspect movement
the piston ring
of the valve complete
set.
How to inspect
How to inspect
Caution
Trouble and remedy
The valve does not
open.
(Fluid does not flow.)
The valve does not
close.
(Fluid flow does not stop.)
See "8.3 Troubleshoothing."
Trouble and remedy
Seal seat surface of the
valve is damaged.
Seal seat surface of the
body is damaged.
Seal seat surface,
sliding surface or both
are damaged.
The piston ring is
damaged.
The piston ring cannot
be detached from the
valve.
14
See "8.3 Troubleshoothing."
Replace the valve
complete set.
Replace the product.
Replace the valve
complete set.
Replace the valve
complete set.
Replace the valve
complete set.
■EPDT-247i■
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