FB_SV/EV
04 / 2014
Use a heating jacket!
Fault RemedyPossible cause
Remove flange and threaded protection
caps
Icing incurred when blowing out
Either replace or readjust safety /
relief valve
The setting pressure is too high / too low
Regular brief venting or heating /cooling of
the safety / relief valve
Viscous / sticky / hardening medium
Replace safety / relief valvebellow designe (161) faulty, no longer
compensates counter pressure
Remove spindle blocking screw (149)
Safety / relief valve doesn’t respond
It must be possible to briefly vent the
safety/relief valve over ≥ 85% of response
pressure
Pressure below ≤ 85% of response
pressure
Can’t be vented
The operating pressure must be
≤ 90% of response pressure
The operating pressure is
≥ 90% of response pressure
Brief venting of safety / relief valve,
replace if necessary
Contamination between seating (001 / 003)
and disc (060)
Safety / relief valve seating leaky
Risk of caustic burning, burning and / or
poisoning
Use smaller safety / relief valveover-dimensioned safety / relief valve
Use larger valveSafety / relief valve too small
Injuries caused by fluid residues
Flutter
Opening pressure too high
Spindle blocking screw (149) not removed
Flange and threaded protection caps have
not been removed
Establish which fluid is in the safety /
relief valve before it is dismantled
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