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Operating instructions
Inspection and maintenance intervals
Description
Inspection
Functional testing
External inspection
Internal inspection
Strength test
7.3
Fault table
Fault
Leak at the stem
Leak between body I and
body II
Leaking lateral connections
Body leaking
Diverter valve cannot be
switched over
Recommended intervals
Interval
During start-up
Inspection and maintenance in
accordance with the respective
legal regulations.
In Germany, for example,
according to the Operational
Safety Ordinance
Inspection and maintenance in
accordance with the respective
legal regulations.
In Germany, for example,
according to the Operational
Safety Ordinance
Every 5 years or ≥ 500 loading
cycles
Every 10 years
Cause
Gland nut loose
Packing gland defective
Fit on the stem damaged
Body I loose
Seal damaged
Inadequate seals
Blind plug / bolted-on safety
valves loose
Lateral connections cracked
Discontinuity/gas cavity open
Gland nut overtightened
Thread seized
Lever lock not removed
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Scope
Visual inspection
of the diverter valve for damage
of the valving marking for legibility;
Leak-tightness
at the packing gland;
between body I and body II;
of the valve seat;
at the connections;
at the plug screw;
Test the opening and closing functions
of the diverter valve.
Test the opening and closing functions
of the diverter valve including a visual
inspection.
Function and tightness test including
visual inspection.
Replacement of all sealing elements,
including a function and tightness test as
well as a visual inspection.
Replacement of all sealing elements,
including a function and tightness test as
well as an inspection.
Remedy
Retighten the gland nut
Replace the diverter valve
Replace the diverter valve
Tighten the bolts
Replace the diverter valve
Seal with suitable sealants
Tighten to the specified torques
Replace the diverter valve
Replace the diverter valve
Loosen gland nut
Tightness must still be ensured
Replace the diverter valve
Remove lever lock
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