STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5020, rev.03 07/2021 - SC/VHS 18
8 MAINTENANCE
Before performing any maintenance operations always wear protective gloves,
clothing, and eyewear.
Before proceeding with any maintenance operation the following instructions
must be respected:
- Disconnect any operating lines providing hydraulic pressure, electric
power, or a control signal to the actuator. Be sure the actuator cannot
suddenly open or close the valve
- Close the hydraulic feed line and make sure that there is no pressure in
the actuator cylinder and the control unit, to ensure safety of maintenance
staff.
Warning: 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.
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.
- 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.
- Check that the signals to the remote control desk are correct.
- Check that the hydraulic supply pressure value is within the required range.
- If there is an filter on the actuator please check the proper functionality.
- Check that the external components of the actuator are in good conditions.
- Check all the paint-coat of the actuator. If some areas are damaged, repair the paint-coat
according to the applicable specification.
- 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.
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