... ,lamp base&welded junction 4,single-track flow Brief introduction1, RF type expansion valve is a traditional thermal expansion valve.2 ... base and welded junction.6, The capillry's length of RF type expansion valve is a standard of 1.5 meters ... .512.311000RFW22-4.53.512.310600RFW22-5.06.522.919800 RF type expansion valve