HEROSE T118, Operating Instructions Manual

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Operating instructions
herose.com
1 9
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
Recommended intervals
Inspection Interval Scope

Inspection
During start-up

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.

Functional testing
Annually

Test the opening and closing
functions of the valve including a visual
inspection.

External inspection
Every 2 years

Function and tightness test including visual
inspection.

Internal inspection
Every 5 years or ≥ 500
loading cycles

Replacement of all sealing elements,
including a function and tightness test as
well as a visual inspection.

Strength test
Every 10 years

Replacement of all sealing elements,
including a function, leak and pressure test
as well as an inspection.
7.3 Fault table
Fault Cause Remedy

Leak between bonnet
and lower part
Bonnet loose

Tighten bonnet.
O-ring damaged

Replace O-ring.

Leak in the seating
Foreign body
between stem and
seat

Remove foreign body / flush the system.
Seating damaged

Replace bonnet.
Stem sealing surface
damaged

Replace bonnet.