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7.3
Fault table
Fault
Safety valve does
not respond
Not liftable
Leak in the seating
Damage to the
inlet/outlet
Shock waves
Constantly blowing
off
Chattering
Inadequate
capacity
Operating instructions
Cause
Covers have not been
removed;
Test pressure too high;
Back pressure not taken into
account;
Pressure below 85% of the set
pressure;
Foreign bodies between cone
and seating, contaminated
medium;
Seating damaged;
Cone seal damaged;
Safety valve has chattered;
Transport damage;
Wrong connecting thread /
tightening torque too high;
Impermissible forces such as
bending or torsional forces are
being transmitted;
Safety valve not mounted at
the highest point;
water not drained correctly or
at all;
Spring corroded by
impermissible medium and
broken;
System pressure too high
Seal damaged;
Pressure drop in the inlet line
>3%;
Seals for inlet and outlet
connector too small or not
installed centrally;
Safety valves are too powerful;
Outlet line too long or diameter
too small;
Inlet or outlet connector too
small;
Back pressure higher than 3%;
Safety valves dimensioned
incorrectly for the plant
conditions;
Safety valves not being used in
accordance with the applicable
regulations;
herose.com
Remedy
Remove covers.
Replace the safety valve.
Replace the safety valve.
Lifting in the range ≥85 % of the set
pressure without aids.
Remove foreign bodies by briefly
lifting / flush the system or replace the
safety valve.
Replace the safety valve.
Replace the safety valve.
See "Chattering".
Replace the safety valve.
Replace the safety valve.
Install stress-free.
Install the safety valve at the highest
point.
Attach water drain according to
regulations.
Replace the safety valve.
Replace the safety valve.
Replace the safety valve.
Reduce resistance through chamfer or
radius in the connecting socket;
choose a larger one if necessary.
Shorter inlet line.
Incorrect safety valve; exchange it.
Change conditions.
choose smaller safety valves.
Use a larger nominal diameter or a
back-pressure-compensating
stainless steel bellows. The max.
height is to be specified by the
manufacturer.
Dimensions must be larger than the
nominal inlet or outlet diameter.
Use back-pressure-compensating
stainless steel bellows. The max.
height is to be specified by the
manufacturer.
Re-dimension and replace the safety
valve.
Change conditions.
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