HEROSE 06810, Operating Instructions Manual, Page: 13 / 14

Operating instructions
herose.com 13
7.3 Fault table
Fault Cause Remedial action
 Safety valve does
not respond
Covers have not been
removed
 Remove covers
Setting pressure too high 
Replace the safety valve
Back pressure not taken into
account

Replace the safety valve
 Not liftable Pressure below 85% of the
set pressure  Lifting in the range ≥85 % of the set
pressure without aids
 Leak in the seat Foreign bodies between cone
and seat, contaminated
medium  Remove foreign bodies by briefly
lifting / flush the system or replace
the safety valve
Seat damaged 
Replace the safety valve
Cone seal damaged  Replace the safety valve
Safety valve has fluttered  See "Fluttering"

Damage to the
inlet/outlet
Transport damage
 Replace the safety valve
Wrong connecting thread /
tightening torque too high

Replace the safety valve
impermissible forces such as
bending or torsional forces
are being transmitted.
 Install stress-free
 Pressure surges
Safety valve not mounted at
the highest point
 Install the safety valve at the
highest point
water not drained correctly or
at all  Attach water drain according to
regulations

Constantly
blowing off
Spring corroded by
impermissible medium and
broken
 Replace the safety valve
Cone seal damaged 
Replace the safety valve
 Fluttering
Pressure loss in the supply
line >3%

Reduce resistance through chamfer
or radius in the connecting socket;
choose a larger one if necessary
Seals for inlet and outlet
connector too small or not
installed centrally

Change conditions
Safety valves are too
powerful
 choose smaller safety valves
Blow-off pipe too long or
diameter too small

Use a larger nominal diameter or a
back-pressure-compensating
stainless steel bellows. The max.
height is to be specified by the
manufacturer.
Inlet or outlet connector too
small 
Dimensions must be larger than the
nominal inlet or outlet diameter
Back pressure higher than
10% or 15% respectively
 Use back-pressure-compensating
stainless steel bellows. The max.
height is to be specified by the
manufacturer.
 Inadequate
performance
Safety valves dimensioned
incorrectly for the plant
conditions
 Re-dimension and replace the
safety valve
Safety valves not being used
in accordance with the
applicable regulations
 Change conditions