Hb/97 Built-In Slam-Shut Valve Troubleshooting - PIETRO FIORENTINI Reflux 819 Use And Maintenance Manual

10.4.5 - HB/97 BUILT-IN SLAM-SHUT VALVE TROUBLESHOOTING

WARNING!
If the built-in slam-shut valve tripped, close the inlet and outlet valves (V1 and V2) of the line before any
other operation and discharge pressure.
Failure
Incorrect release pres-
sure
Impossible to reset
HIGH PRESSURE REGULATOR
EN
Use, maintenance and warning manual
Device
PRESSURE SWITCHES
MODELS
102 - 105
SLAM-SHUT VALVE
HB/97 BUILT-IN SLAM-
SHUT VALVE
PRESSURE SWITCHES MODELS
102 - 105
BYPASS DEVICE
HP2/2
| TROUBLESHOOTING | REV. B
Possible causes
Max. and/or min. pressure
spring incorrect calibration.
Leverages with friction
Springs (11.17) collapsed
Springs (11.17) out of level
Stem (6) locked due to
friction
Stem (6)
locked in shut-off position
Plug (71)
locked due to friction
"U-shaped" ring (63)
damaged
I/DWR ring (64)
damaged
Wrong calibration
spring of max and / or min.
The downstream pressure
is not consistent with the
min and/or max setting of
the slam-shut device
Leverages with friction
Breakage of the
Diaphragm breakage (43)
if a min. pressure spring is
installed.
Manual release
button locked
Filter (11) clogged
Intervention
Repeat calibration by ad-
justing the ring nuts
Clean and lubricate the
linkage and replace the box
if necessary
Replace
Reposition
Clean and lubricate
Clean and lubricate
Clean and lubricate
Replace
Replace
Repeat calibration by ad-
justing the ring nuts
Adjust the downstream
pressure
Clean and lubricate
the levers and if needed
replace the box
Replace
Clean and lubricate
Replace
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