3
5. Maintenance
4.1 Precautions for Maintenance
Warning
Completely discharge the internal pressure of the product, piping, and equipment before maintenance
or inspection. If the fluid is hot, cool down the product to a level where you can touch it with bare hands.
* Failure to follow this notice may result in scalds, burn or injury.
Caution
1. Do not disassemble the product unless necessary.
2. Avoid rapid change of temperature and pressure to the product
3. Make sure that the piping is out of operation before dismounting the product from the piping.
5.2 Periodic inspections
Conduct periodic inspections once per month in order to maintain the optimal performance of the product.
Inspection Item:
Valve open/close operation is proper.
Abnormal noise is not be detected.
Outside leakage is not be detected.
In case of any failure, give a proper remedy referring to “6. Troubleshooting.”
6. Troubleshooting
Trouble
Cause
Remedy
No flow
1.
The product is closed.
1. Open the product.
2.
Flange dust caps are not
removed.
2. Remove dust caps on the flanges.
Poor flow
1. The product is not open enough.
1. Fully open the product.
2. Piping is clogged.
2. Clean the piping.
Difficulty in
handwheel
operation
1. The spindle is dry.
1. Grease the spindle.
2. The gland packing is tightened
too much.
2. Slightly loosen the gland with keeping gland
tightness enough.
Spindle
leakage
1. The bellows is damaged.
1. Tighten the gland until tightness is reached.
Replace the product as soon as possible.
Seat
leakage
1. Shutoff is not correct.
1. Tighten the handwheel by hand without
using a tool.
2. The valve seat or valve is
damaged.
2. Replace the product with a new one.
3. Foreign substances are stuck
between the valve and valve seat.
3. Clean the product. Install a strainer at the
inlet side of the product.
For any troubles other than above, please contact us.
