Casting gate valve is cast gate valve, the general casting of the valve pressure class is relatively low (such as PN16, PN25, PN40, but also high pressure, can be up to 1500Lb, 2500Lb), most of the diameter of DN50 above.Casting valve is cast into the valve, the general casting of the valve pressure class is relatively low (such as PN16, PN25, PN40, but there are also high pressure, can be up to 1500Lb,, 2500Lb), most of the diameter is more than DN50. When the gate valve is opened, the flow path is completely clear when the lift height of the gate is equal to 1:1 of the valve size, but this position cannot be monitored during operation. In actual use, the valve stem is marked by the vertex, that is, the open position, as its full open position.In order to consider the temperature change lock phenomenon, usually in the open to the vertex position, and then back to 1/2-1 turn, as the full open valve position.Therefore, the full open position of the valve is determined by the position of the gate. Stainless steel gate valve, forged steel gate valve, flange gate valve, flange ball valve, two-piece ball valve some gate valve, stem nut is located in the gate, the hand wheel rotation drive stem rotation, and make the gate lift, this kind of valve is called rising stem gate valve or no rising stem gate valve. Zeco casting gate valves are widely used in high temperature and high pressure oil, natural gas and other industrial industries.