ARI Armaturen SAFE-TCP/TCS950 EN - Manual (Page 15)

Rev. 0040401000 2913 Page 2-15
Operating and installation instructions
SAFE, SAFE-P, SAFE-TC, SAFE-TCP/TCS
8.0 Troubleshooting
In the event of malfunction or faulty operating performance check that the installation and
adjustment work has been carried out and completed in accordance with these Operating
Instructions.
If malfunctions cannot be eliminate with the help of the following table
“9.0 troubleshooting table”, the supplier or manufacturer should be consulted.
9.0 Troubleshooting table
-
ATTENTION !
It is essential that the safety regulations are observed when identifying faults.
ATTENTION !
- read point 10.0 and 11.0 prior to dismantling and repair work!
- read point 6.0 before restarting the plant !
Fault Possible cause Corrective measures
Safety valve does not
respond,
no flow Flange covers not removed. Remove flange covers.
Test gag still in place. Remove test gag.
Spring blocked. Remove pipe or screw projecting into
bonnet through inspection connection.
Set pressure too high. Reset (point 7.1) or replace the safety
valve.
Stainless steel bellow defective,
no back-pressure compensation. Replace the safety valve.
Back-pressure not taken into account. Reset (point 7.1) or, if necessary,
replace the safety valve.
The use of a stainless steel bellow to
compensate for back-pressure should
be considered.
Medium viscous or sticky Use bellow / heating jacket. Insert
rupture disc upstream if necessary.
The valves and piping must be
protected against freezing and
solidifying media. Heating !
Stem cannot be lifted. Pressure less than 85% of set
pressure. It must be possible to lift the spindle at
over 85% of the set pressure.
Safety valve seat leaking. Working pressure higher than 90% of
set pressure. Working pressure must be less than
90% of the set pressure.
At low pressures: lever not in neutral
position with closed cap. Press lever into neutral position
(towards bonnet).
Safety valve flattering. Refer to separate point “Flattering”.
Medium contaminated; foreign body
between seat and disc. Raise spindle briefly or, if necessary,
replace safety valve.
Use of a soft sealing disc should be
considered.