air conditioner expansion valve 1.For R22,R134A,R407A,R507/404A 2. easy to change driving head and valve ... disc 3.Port:7/8 9/8 air conditioner expansion valve ... turn off connecting bolts, it is easy to change driving head and valve disc.l Stable superheat ... anticlockwise one round,reduces superheat 0.3°C. air conditioner expansion valve, for R22,R134A,R407A,R507 ...