The typical hydraulic system is cleaned by a single filter in the circuit. Often this filter is located on the inlet line in front of the pump, to protect the pump and downstream components; so used, ...
Excellent filtration has always been a necessity in refrigeration. Whether the refrigerant/oil combinations are CFCs/HCFCs with mineral or alkylbenzene oil, or HFCs with polyolester (POE) lubricant, ...