... junction 4,single-track flow Brief introduction1, RF type expansion valve is a traditional thermal expansion valve.2, It is used ... junction.6, The capillry's length of RF type expansion valve is a standard of 1.5 meters.Technical parameters1, Refrigerant: R22 , R502, ... 1Mpa/10s4,Adjustment range of superheat degree: 3.5 °C 5, Maximum test pressure: 1.8 Mpa6, Maximum working pressure: low-pressure ...