Heldon conventional oil separators are manufactured in accordance with AS 2971. They are designed for maximum flow with minimal pressure drop, while effectively removing oil suspended in the refrigerant. Oil removal is achieved using stainless steel screens that have been optimised for both flow and oil removal. A baffle plate allows separated oil to de-aerate while remaining warm and viscous. A stainless steel ball float and precision needle and seat are used to achieve automatic oil return to the compressor crankcase.