... 3,lamp base&welded junction 4,single-track flow Brief introduction1, RF type expansion valve is a traditional thermal expansion valve. ... 2, It is used for regulating the liquid refrigerant's supply qantity in evaporator.3, It is ... , R502, R134A, R404A2, Evaporative temperature: -25 to 15 °C3, Valve port leaage: ≤ 0.1Mpa/10s4,Adjustment range of superheat degree ...