If into the dryer compressed airflow and pressure beyond design range, separation effect will decline, liquid water would be through the separator make dryer out of compressed air pressure rise.
Frozen type airdryer by lowering the temperature of compressed air to close to the freezing point of water, that extra water vapor condense into liquid water, thus and flow separation.
The above two kinds of devices can be in a dryer the flow of compressed air cooling to constant temperature and avoid a cold and led to excessive condensing liquid produce.