Apart from valves, a great filter plays an essential role for a air compressor as well. Air compressor filters are an important part of your compressed air system. Installing the right type of filters and maintaining them regularly will ensure a consistent supply of clean air to your operations and reduce pressure drop. Filters start at the intake of the compressor and finish at the point of use.Dirty compressor intake filters will reduce compressor efficiency and allow dirt particles to enter the compressor http://www.vimce.net/air-compressor-filter/