Electric ball valve structure briefly, only by a small number of parts,materials consumption province; small size, light weight, installation size,small driving torque, pressure regulating valve, simple, quick, just to quicklyrotate 90 ° Open and close. Electric ball valve in the full open position, the butterflyplate thickness is only when the medium flows through the body resistancethrough the valve pressure drop is very small place, it has a better flowcontrol features. There are shells of electric ball valve seals and two sealtype metal sealing. http://www.51orders.com/showroom/Electric-Ball-Valve.htm