-6-
■EPDT-310■
7. Maintenance
Most of problems with the product are caused by foreign substances and scale in the piping.
A phenomenon similar to valve failure could occur due to the failure of the pressure gauge,
leakage or insufficient tightening of the stop valve in the by-pass line, clogging of the strainer,
and other causes. Check the above possible causes and take a proper remedy and preventive
measures specified in “7.2 Troubleshooting”.
7.1 Warning and inspection for maintenance and inspection
Warning
1. Conduct periodic inspection to maintain functions and performance of the product.
* General users should ask experts (staff of facility management/engineering companies, etc.) to
perform periodic inspection.
2. When conducting disassembly or inspection, be sure to discharge inner pressure of the product, piping
and equipment, and cool down the body of the product until it can be touched by bare hands. Do not
touch it with bare hand directly till it is cooled completely.
* Failure to follow this notice may result in scalds or injury due to the residual pressure. Also, it may
make the surroundings dirty.
Caution
1. Completely discharge the fluid inside of the product and piping before leaving the product not operated
for a long time or at the time of regular inspection.
* Failure to follow this notice may cause malfunction due to occurrence of foreign substance or scale
inside of the piping.
2. After leaving the product not operated for a long period, perform periodic inspection before start-up of
operation.
7.1.1 Consumable parts and replacement term
For consumable parts, service life differs according to frequency of usage or usage
condition. Rough indication of replacement term is as follows (parts number in the chart
indicates number in “7.3 Fig.3 Exploded view”):
Parts name
Parts number
Replacement term
Gasket
3
3 years
7.1.2 Regular inspection items and period to maintain function and performance
Regular inspection items and period are as follows:
Inspection items
Inspection period
Leakage check (visual check) with
conducting open and closing operation
More than once a year
Leakage check (visual check) from leak
detection port (see Fig.6)
More than once a year
Leakage check (visual check) from
position indicator (see Fig.1)
More than once a year
