Daily And Periodic Inspections - Yoshitake DP-200 Series Manual

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 keep 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. After re-assembling, perform test working before starting operation again.
7. 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.
8. When reassembling, connect all the parts securely. Tighten the bolts uniformly in diagonal positions
to prevent uneven tightening.

8.2 Daily and periodic inspections

Conduct daily and periodic inspection/replacement in order to maintain the optimal performance of
the product.
 Daily inspection (once a day)
Item
Working
conditions
Outside
leakage
 Periodic inspection (once a year: Add the following items to the above daily inspection items)
Item
Seal seat
surfaces of the
body and the
diaphragm
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.
Inspect the product
visually.
How to inspect
Disassemble the product
and visually inspect the
parts.
Disassemble the product
and visually inspect the
parts.
Caution
Trouble and remedy
The valve does not
open.
(Fluid does not flow.)
The valve does not
close.
(Fluid flow does not stop.)
See "8.4 Troubleshoothing" on Page 13.
Trouble and remedy
Seal seat surface of the
diaphragm is damaged.
Seal seat surface of the
body is damaged.
Seal seat surface,
sliding surface or both
are damaged.
13
See "8.4 Troubleshoothing"
on Page 13.
Replace the diaphragm
complete set.
Replace the product.
Replace the diaphragm
complete set.
■ EPDT-266c ■