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８． Maintenance Procedure
８．１ Troubleshooting
Problem
Pressure does not
rise to desired
level.
Reduced pressure
exceeds prescribed
level.
External leakage
Abnormal noise is
heard.
※Foreign matter and scales in pipe may cause most of problems of pressure
reducing valve. Be careful sufficiently to foreign matter in pipe.
※Phenomenon alike valve trouble may happen by fault of pressure gauge,
fluid leakage from by-pass valve, forgetting to close the by-pass valve,
clogging strainer, and etc. First, check the said particulars before
above troubleshooting.
Causes
1. Incorrect pressure is being
used.
2. The conductor pipe⑮ is clogged
with foreign matter.
3. Nominal size is too small for
these specifications.
4. Incorrect adjustment.
5. Strainer is clogged.
6. Pressure gauge malfunction.
1. Foreign matter is embedded in
the valve ④ and/or valve seat
③, or else scratches exist.
3. By-pass valve is leaking.
Diaphragm⑨ is broken.
1. Nominal size is too large for
these specifications.
2. Pressure reduction ratio is
too large.
3. Air problem is caused.(Liquid
use)
4. An abrupt OPEN/CLOSE valve is
located too close to the
pressure reducing valve.
-12-
1. Correct the pressure being used.
(Refer to the "Specifications".)
2. Disassemble and clean the conductor
pipe.
3. Replace with the correct nominal
sized item.
4. Re-adjust according to the
adjustment procedure.
(Refer to the "Adjustment
Procedure".)
5. Disassemble and clean.
6. Replace the pressure gauge.
1. Disassemble and clean. If
scratches exist, replace them.
3. Repair or replace the valve.
Replace Diaphragm⑨
1. Replace with the correct nominal
sized item.
2. Use a two-stage reduction.
(Refer to the " Specifications" .)
3. Install a trap.
4. Allow as much distance as
possible between the valves.
Solutions
■EPDT-096b■
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