... 4,single-track flow Brief introduction1, RF type expansion valve is a traditional thermal expansion valve.2, It is used for regulating the liquid ... junction.6, The capillry's length of RF type expansion valve is a standard of 1.5 meters.Technical parameters1, ... R22 , R502, R134A, R404A2, Evaporative temperature: -25 to 15 °C3, Valve port leaage: ≤ 0.1Mpa/10s4,Adjustment range of superheat degree ...