Electric control valve structure is simple, only by a few parts, material consumption; small volume and light weight, small installation size, small drive moment, pressure regulating valve, the operation is simple, quick, can only rotate 90 degrees rapid opening and closing; and also has good flow regulating efficacy and sealing properties. The scope of application in the large size, low pressure, electric control valve is the valve leading situation. Electric control valve in a fully open position, the butterfly plate thickness is the only resistance when the medium flows through the valve body, so the pressure drop through the valve is very small, so it has a good flow control characteristics. Electric control ball valve has a seal and metal seal two kinds of metal seal.