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Maintenance and service
7.1
Safety during cleaning
Take note of the specifications in the safety data sheet, the general occupational health and
safety rules and the HEROSE information sheet "Use with oxygen" if degreasers are used for
process-related reasons for the cleaning of bearing parts, unions and other precision parts.
7.2
Maintenance
The maintenance and inspection intervals must be defined by the operating company according to the
operating conditions and the national regulations.
The manufacturer's general recommendations for the maintenance and inspection of the globe valves are
given in the table below and are based on the national standards of the country of manufacture.
Inspection and maintenance intervals
Description
Inspection
Functional testing
External inspection
Internal inspection
Hydraulic test
7.3
Fault table
Fault
Leak at the stem
Ball valve does not
open / close
Operating instructions
Recommended intervals
Interval
During start-up
Annually
Every 2 years
Every 5 years or ≥ 500
loading cycles
Every 10 years
Cause
Gland nut loose
Packing gland defective
Fit on the stem damaged
Seal damaged
Gland nut overtightened
Actuator not working
herose.com
Scope
Visual inspection
of the valve for damage;
of the marking for legibility;
Installation position;
Leak-tightness
at the packing gland;
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.
Function and tightness test
including visual inspection.
Replacement of all sealing
elements, including a function and
tightness test and visual inspection
with check for cracks.
Replacement of all sealing
elements, including a function, leak
and pressure test as well as an
inspection.
Remedy
Retighten the gland nut
Replace the packing gland
Replace the stem
Replace seal
Loosen the gland nut
Tightness must still be ensured
Check energy supply to the
actuator
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