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STI S.r.l.
– Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018
– RTQHS
20
8
MAINTENANCE
8.1
Periodic Inspections
Inspect the general conditions at regular intervals: recommended frequency of inspection is one time every
two years but this frequency could be changed depending on the installation and working conditions.
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Check that the actuator operates the valve correctly and with the required operating times. If the actuator
operation is very infrequent, carry out a few opening and closing operations with all the existing controls
(remote control, local control, emergency controls, etc.), if this is allowed by the conditions of the plant.
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Check that the signals to the remote control desk are correct.
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Check that the hydraulic supply pressure value is within the required range.
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If there is an air filter on the actuator, bleed the condense water accumulated in the cup by opening the
drain cock. Disassemble the cup periodically and wash it with soap and water; disassemble the filter: if
this is made up of a sintered cartridge, wash it with nitrate solvent and blow through with air. If the filter is
made of cellulose, it must be replaced when clogged.
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Check that the external components of the actuator are in good conditions.
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Check all the paint-coat of the actuator. If some areas are damaged, repair the paint-coat according to
the applicable specification.
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Check that there is no leak in the hydraulic connections. If necessary tighten the nuts of the pipe-fittings.
Warning
Take care that a build-up of dust or dirt on the actuator can inhibit cooling and
contribute to increase surface temperature. The user should plan and provide
for a periodic cleaning/maintenance program that will maintain the external
surface of the actuator free from excessive layer of dust.
Important
Use only STI original spare parts. STI cannot accept responsibility for any
damages that occur from using spare parts or fastening materials from other
manufacturers.
If STI products (i.e. gasket, o-ring etc) have been on store for longer periods
check these for corrosion or deterioration before using these products.
