ARI Armaturen PRESO EN - Manual (Page 11)

Rev. 0040402000 0410 Page 11
Operating and installation instructions
PRESO
®
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
No flow Flange covers not removed Remove flange covers
Little flow Dirt sieve clogged Clean / replace sieve
Piping system clogged Check piping system
Pressure regulating valve
does not respond, no flow Pressure range too high Reset (point 6.0) or replace the
pressure regulating valve
Stainless steel bellow defective Replace pressure regulating valve
Medium viscous or sticky Use heating jacket
The valves and piping must be
protected against freezing and
solidifying media Use heating jacket !
Valve installed against flow direction Turn the valve into flow direction
Pressure regulating valve
seat leaking Pressure regulating valve flattering Refer to separate point “Flattering”
Medium contaminated; foreign body
between seat and disc Replace pressure regulating valve
Flange broken Damage during transport Replace pressure regulating valve
Flange bolts not evenly tightened Replace pressure regulating valve
Transfer of unacceptable forces, e.g.
bending or torsional forces Install free of tension
Pressure regulating valve
constantly open Spring corroded by medium and broken Replace pressure regulating valve
Spindle guide corroded
Flattering Pressure regulating valve capacity too
high Install smaller pressure regulating
valve
Capacity too low Pressure regulating valve not applied
unsuitable for plant conditions Select and install suitable pressure
regulating valve