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You can read off the pressure in the filter vessel using the manometer or pressure gauge. If the pressure is too high, you can vent the filter vessel using the relief valve.
If you fail to do so, the pressure may become too great and the filter vessel may burst or even, in extreme cases, explode.
If the manometer gauge indicates that there is more than 1.1 bar in the filter vessel, the filter must be vented using the relief vent valve.