VAL
S
TEAM
ADCA
Produced in accordance with Sound Engineering Practices of the European PED - Pressure Equipment Directive.
IMI P130.08 E 00.20
24
10. TROUBLESHOOTING
Before applying any corrective measure, refer to section 1 – Safety information.
If the malfunction cannot be solved with the help of the following table, contact VALSTEAM
ADCA or its representative.
Malfunction
Possible cause
Corrective measure
Downstream pressure
rises above the adjusted
set pressure.
Seat and/or plug is worn or damaged.
•
Replace plug and/or seat - see sections
9.2.1, 9.2.2 or 9.3.1.
Foreign matter is stuck between seat
and plug.
•
Remove foreign matter and replace seat
and plug if necessary - see sections 9.2.1,
9.2.2 or 9.3.1.
•
Consider installing a filter upstream of the
regulator.
Bypass valve is leaking.
•
Check, clean and replace the bypass valve
if necessary.
Downstream pressure
does not reach the
required set pressure.
The adjustment spring regulating range
is incorrect.
•
Replace the adjustment spring.
The inlet upstream pressure to
the regulator is too low or there is
insufficient flow rate to meet the
system consumption.
•
Ensure that the upstream pressure to
the regulator is equal or greater than the
required set pressure at minimum and
maximum consumption scenarios.
Foreign matter is blocking the valve or
flow restriction is limiting flow through
the valve.
•
Remove foreign matter and consider
installing a filter upstream of the regulator.
•
Check and solve flow restrictions (e.g. fully
opening a partially open shut-off valve,
cleaning clogged filter elements, etc.).
The regulator is undersized.
•
Check valve sizing and if necessary, install
a different sized regulator.
•
Contact VALSTEAM ADCA.
Leakage between body
and cover or through
the adjustment knob or
screw.
The lower diaphragm (15) is damaged.
•
Replace damaged diaphragms – see
sections 9.2.2 or 9.3.2.
Cover (2) tightening torque is too low.
•
Tighten cover (2) with the recommended
torque – see sections 9.4 – Tightening
torques.
The regulator has a self-relieving
option and the O-ring (13) is damaged.
•
Replace the O-ring (13) - see sections 9.2.2
or 9.3.2.
The regulator is hunting
or chattering.
The flow rate through the regulator is
too low. The regulator is oversized.
•
Check valve sizing and if necessary, install
a smaller regulator.
•
Contact VALSTEAM ADCA.
The reducing ratio is too high.
•
Install a second regulator in series (two-
stage reduction).
•
Contact VALSTEAM ADCA.
The downstream pressure
rises too much when
flow rate reduces to
a static condition (no
consumption).
Flow rate through the regulator is too
high.
•
When occurring during start-up, allow
downstream system to pressurize slowly to
prevent demage to the regulator.
•
Check valve sizing and if necessary, install
a larger regulator or a second regulator in
parallel.
•
Contact VALSTEAM ADCA.
