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7
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 valve are given
in the table below and are based on the national standards of the country of manufacture.
Inspection and maintenance intervals
Inspection
Inspection
Functional testing
External inspection
Internal inspection
Strength test
7.3
Fault table
Fault
Leak between bonnet
and lower part
Leak in the seating
Operating instructions
Recommended intervals
Interval
During start-up
Annually
Every 2 years
Every 5 years or ≥ 500
loading cycles
Every 10 years
Cause
Bonnet loose
O-ring damaged
Foreign body
between stem and
seat
Seating damaged
Stem sealing surface
damaged
herose.com
Scope
Visual inspection
of the valve for damage;
of the valving marking for legibility;
Leak-tightness
between bonnet and lower part;
of the valve seat;
Test the opening and
closing functions of the valve.
Test the opening and closing
functions of the 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, leak and pressure test
as well as an inspection.
Remedy
Tighten bonnet.
Replace O-ring.
Remove foreign body / flush the system.
Replace bonnet.
Replace bonnet.
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