Description:? 1, selected materials, in line with domestic and international standards, high overall quality of the material. ? 2, in line with the requirements of domestic and foreign advanced standards, reliable sealing, excellent performance, attractive appearance. ? 3, Sealing pair advanced and reasonable, gate and seat sealing surface with different hardness Stellite (Stellite) cobalt-based alloy cladding made of reliable sealing, high hardness, wear resistance, high temperature resistance corrosion, anti-abrasion performance and long life. ? 4, stem quenched and surface nitriding treatment, good corrosion resistance, scratch resistance and abrasion resistance. ? 5, the use of flexible wedge gate structure, medium and large caliber set of thrust bearings, friction force is small, and with a striking hand wheel, open and close with ease. Widely used in petrochemical, power plants and other oil products, steam piping for lifting device to connect or disconnect the pipeline medium. ? 6, can be a variety of standard pipe flanges and flange sealing surface forms to meet various project needs and user requirements.