Large diameter turbine gate valve is one of the commonly used shut-off valves, mainly used to connect or cut off the medium in the pipeline, and is not suitable for regulating the flow rate of the medium. Large diameter turbine gate valve is applicable to a wide range of Pressure, temperature and diameter, especially for medium and large diameter pipelines. The large diameter turbine gate valve can reduce the Pressure when the large diameter gate valve is opened, and the bypass valve can also be used in emergency. The large-diameter turbine gate valve meets the requirements of advanced standards at home and abroad, with reliable sealing, excellent performance, and beautiful appearance. The sealing pair is advanced and reasonable, and the sealing surfaces of the gate and valve seat are welded with Stellite cobalt based hard alloy of different hardness. The sealing is reliable, hard, wear-resistant, high temperature resistant, corrosion-resistant, and has good abrasion resistance and long service life. (1) Low fluid resistance. The internal medium channel of the large-diameter turbine gate valve body is straight through, and the flow direction of the medium does not change when passing through the gate valve, so the flow resistance is relatively small. (2) Opening and closing are relatively effortless. By installing the umbrella gear, one person can open the large-diameter gate valve, and the direction of the gate movement is perpendicular to the direction of the medium flow during opening and closing. Compared to globe valves, gate valves require less effort to open and close. (3) The direction of medium flow is generally not restricted. The medium can flow in any direction from both sides of the gate valve, achieving the purpose of connection or disconnection. Easy to install, suitable for pipelines where the flow direction of the medium may change. 1 WCB A105 Cr5Mo ZGCr18Ni9Ti 2wcb A105 Cr5Mo ZGCr18Ni9Ti 3 WCB A105 Cr5Mo ZGCr18Ni9Ti 4wcb 25 Cr5Mo ZGCr18Ni9Ti 5、Valve rod：2Cr13 2Cr13 38CrMoA1、25Cr2MoV 1Cr18Ni9Ti 6. Valve seat: 25 25 304 304 7. Sealing ring: 304, reinforced flexible graphite 8. Filler: Reinforced flexible graphite 9. Valve stem nut: ZCuA110Fe3