Thermal Expansion Valve 1.For R22,R134A,R407A,R507/404A 2. easy to change driving head and valve disc 3.MOP Expansion ValveOperating ... it is turned counterclockwise, superheat will bedecreased. For each turn of the Adjusting Stem, the superheat will bechanged about 4. Set ... orifice you chose is suitable to the TEV of your system before install it. Thermal Expansion Valve for R22 R134A R407C R507/404A ...