HEROSE 0681 Series, Руководство по эксплуатации

Страница: 14 / 16

Operating instructions
10
Phone +49 4531 509-0
7.3 Fault table
Fault Cause Remedial action
 Safety valve does
not respond
Covers have not been
removed;

Remove covers.
Test 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
seating
Foreign bodies between cone
and seating, contaminated
medium;  Remove foreign bodies by briefly
lifting / flush the system or replace
the safety valve.
Seating damaged;  Replace the safety valve.
Cone seal damaged;  Replace the safety valve.
Safety valve has chattered;  See "Chattering".
 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.
 Shock waves
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.
System pressure too high  Replace the safety valve.
Seal damaged;

Replace the safety valve.

Chattering
Pressure drop in the inlet line
>3%;
 Reduce resistance through chamfer
or radius in the connecting socket;
choose a larger one if necessary.
 Shorter inlet line.
 Incorrect safety valve; exchange it.
Seals for inlet and outlet
connector too small or not
installed centrally;
 Change conditions.
Safety valves are too powerful;  choose smaller safety valves.
Outlet line 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 3%;
 Use back-pressure-compensating
stainless steel bellows. The max.
height is to be specified by the
manufacturer.
 Inadequate
capacity
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.