3 Mounting and installation
Festo – P.BE-MPA-E N – 1309f – English 61
When exhausting large-volume actuators or if the exhaust performance is too small, back pressures
can build up in t he valve terminal exhaust ducts. The back pressures can lead to pneumatic actuation of
other valves, especially with unswitched 3/2-directional control valves that are normally closed.
To avoid back pressures:
• Optimise the pressurisation and ventilation ca pacity of the valve terminal, for example, by using
larger diameter tubing or an additional compressed air supply via pneumatic air supply plates with
exhausting via silencers or exhaust port covers.
• Separate the exhaust ducts, if nece ssary, by using pressure zo nes ( section 2.4.7).
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