ARI Armaturen ARI REYCO RL969 EN - Manual (Page 13)

Rev. 0040404000 4113 Page 2-13
Operating and installation instructions
ARI-REYCO R / RL Series
9.0 Troubleshooting table
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 75% of set
pressure. It must be possible to lift the spindle at
over 75% 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.
Flange broken. Damage during transport. Replace safety valve.
Flange bolts not evenly tightened. Replace safety valve.
Transfer of forces such as bending or
torsional forces. Install free of tension.
Pressure surges. Safety valve not installed at highest
point. Install safety valve at highest point.
Valve drainage inadequate or not fitted. Install drainage system a required by
regulations.
Valve constantly blows off. Spring corroded by medium and
broken.
Replace safety valve.
In the case of vapour, select open cap
or bonnet if possible.