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7.2.1
Inspection and maintenance intervals
Description
Inspection
Functional testing
External inspection
Internal inspection
Hydraulic testing
1
Applies only to industrial valves.
7.3
Fault table
Fault
Leak at the spindle
Leak between bonnet
and body
Leak in the seat
Valve does not open /
close
1
Applies only to industrial valves.
Operating instructions
Recommended intervals
Interval
During start-up
annually
Every 2 years
Every 5 years
Every 10 years
Cause
Gland nut loose
Gland packing defective
Fit on the spindle damaged
Bonnet loose
1
Seal damaged
Foreign bodies between
closing body and seat
1
Seat damaged
Sealing surface of closing
1
body damaged
Gland nut overtightened
1
Thread seized
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Scope
Visual inspection
of the valves for damage;
of the marking for legibility;
Installation position;
Leak-tightness
at the gland packing;
between bonnet and body;
of the valve seat;
Test of the opening and closing
function of the valve.
Test of the opening and closing
function of the valve(s), including
visual inspection.
Check of function and leak-
tightness including visual check.
Replacement of all sealing
1
elements
, including a function and
leak test as well as a visual
inspection.
Replacement of all sealing
1
elements
, including a function,
leak and pressure test as well as
an inspection.
Remedial action
Retighten the gland nut
Replace the gland packing
1
Replace the spindle
Retighten the bonnet screws
1
Replace the seal
Remove foreign body / flush the
system
1
Replace the body
Replace closing body
Loosen the gland nut
Tightness must still be ensured
1
Replace bonnet
Replace closing body
1
1
1
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