... control automatically by the superheat degree of refrigerant.5, It has two connecting format, including lamp base and welded junction.6, ... of RF type expansion valve is a standard of 1.5 meters.Technical parameters1, Refrigerant: R22 , R502, R134A, R404A2, Evaporative temperature: ... ≤ 0.1Mpa/10s4,Adjustment range of superheat degree: 3.5 °C 5, Maximum test pressure: 1.8 Mpa6, Maximum working pressure: ...