172-65254MA-04 (A-COS-10) 22 Apr 2020
19
Troubleshooting
NEVER apply direct heat to the float. The float may explode due to
increased internal pressure, causing accidents leading to serious injury
or damage to property and equipment.
WARNING
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
This product is shipped after stringent checks and inspection and should perform
its intended function for a long period of time without failure. However, should there
be any problem encountered in the operation of the product, consult the
troubleshooting guide below.
Problems are classified as follows:
1. The secondary pressure does not increase.
2. The secondary pressure cannot be adjusted or increases abnormally.
3. Hunting (fluctuation of the secondary pressure) occurs.
4. Chattering (a heavy mechanical noise) occurs.
5. Air leaks from the air trap or condensate is not discharged.
6. Abnormal noises.
Major causes for the above problems are usage under non-specified conditions
(out of specification), insufficient pressure or flow rate, and clogs by dirt and scale.
To ensure performance for a long period of time, it is recommended that the
“Acceptable Operating Range”, “Correct Usage of the A-COS Pressure Reducing
Valve” and “Adjustment” sections be reviewed
.
It is a recommended practice to dismantle and inspect the product once a year for
preventive maintenance purposes. It is especially important to perform an
inspection immediately after the initial run of a new line or before or after equipment
such as a heater is out of service for a long period of time. (Installation, inspection,
maintenance, repairs, disassembly, adjustment and valve opening/closing should
be carried out only by trained maintenance personnel.)
Problem
Symptom
Cause
Remedy
The secondary
pressure does
not rise
The pressure does
not increase
No air is being supplied or
the inlet valve is closed
Check the valves and
piping at the primary side
The entrance to the
screens or strainer is
clogged
Clean or blow down
The secondary
pressure
cannot be
adjusted or
increases
abnormally
Adjustment is
difficult, and set
pressure varies
The pilot screen is clogged Clean
There is insufficient air
flow
Check the flow, replace
the product if necessary
The piston is clogged
with dirt
Clean
Check the piston ring
The piston ring is worn
Replace with a new piston
ring
Continued on the next page
