Magnetic check valve uses magnetic attraction to return the valve plate to its seat rather than spring pressure. A conventional check valve requires an increase in pressure to force the valve plate off its seat thus causing an increase in pressure drop. The Magnetic check Valve has a decreasing force to move it away from its seat. The further it travels the more the magnetic attraction diminishes resulting in a decrease in pressure drop. it can be installed in discharge, liquid and suction lines where it is necessary to ensure fluid flow only occurs in one direction. The valves are suitable for use with HCFC, HFC and CO2 refrigerants along with their associated oils.