... .Stainless base with aluminum shell 4.Forging brass body synchromotor drive SV60 Series Two Way And Three Way Motorized Valve GeneralSV602XX series ... to A (Fig. 1), and when the signal disappears, the valve, with the help of its own spring, returns back to its ... to B (Fig. 3), and when the signal disappears, the valve, with the help of its own spring, returns back to its ...