HEROSE 06C01 Instrucciones De Servicio página 27

Operating instructions
7.3 Fault table
Fault
Safety valve does not
respond
Not liftable
Leak in the seating
Damage to the in-
let/outlet
Shock waves
Constantly blowing off
Chattering
Inadequate capacity
Cause
Covers have not been removed
Test pressure too high
Back pressure not taken into account
Pressure below 85 % of the set pres-
sure
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 transmit-
ted
Safety valve not mounted at the high-
est 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 ac-
cordance with the applicable regula-
tions
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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 regula-
tions.
 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 stain-
less 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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