... upside of valve reduced, so the pressure difference between both side of diaphragm happen and lead to diaphragm lift to open the main ... : R134a,R22,R407C,R404A/507,air,water and oil.Optional voltage of solenoid coils: A.C.: 24V,36V,110V,220V,380V.D ... .C.:12V,24V,110V,220VType and data ConnectionformModelConnectiondimension(in.)Kv value ...