6
Cleaning and maintenance
Festo – MPAC-VI-EN – 2017-12a – English
45
6.2
Cleaning the valve terminal
Note
Disinfectants may contain substances which can damage the components in the short
or long term (e.g. sodium hypochlorite).
Avoid using cleaning agents with a sodium hypochlorite basis.
Do not disinfect the valve terminal with UV light.
Note that the IP degree of protection is without addition of cleaning agents.
Cleaning agents can reduce the surface tension.
– To clean the valve terminal, hot cleaning agents up to +80 °C can be used.
In individual cases you should consult the manufacturer of the cleaning agent/
disinfectant regarding its compatibility with the materials of the valve terminal.
Caution
Accidental actuation of the manual override during cleaning
Switch off the pressure supply to the valve terminal
In this way, you avoid an unintended actuation of the manual override from the high-
pressure spray.
Note
Material damage to the valve terminal and seals.
Do not hold a focused or rotating high-pressure spray on the valve terminal,
especially on the seals.
Material damage can occur from incorrect cleaning. Festo recommends maintaining the following para
meters during cleaning:
– Water pressure < 100 bar
– Spray distance > 300 mm
– Flat spray nozzle with spray distribution > 30 °
– Maximum flow rate < 15 l/min
– Maximum water tempe80 °C
– To clean the valve terminal, foam, spray and gel procedures can be used, for example.
Concentration, processing temperature and environmentally friendly use of the cleaning
agent should follow the specifications of the cleaning agent manufacturer (see data
sheet).
Clean the valve terminal as follows:
Switch off the operating and load voltage supply.
Use cleaner with a maximum of 1 % nitric acid and a maximum of 2 % caustic soda.
For valve terminals with exhaust air silencers, make sure that no water can enter the silencers dur
ing cleaning.