Effortless operation: The force generated by the medium pressure on the sphere is fully transmitted to the upper and lower bearings, and the sphere will not move relative to each other. The sealing force on both ends of the valve seat is uniform, and the operating torque is low. The movable metal valve seat structure with spring preloading can be applied to high temperature, high pressure, and various medium pipelines. According to customer requirements, it can be designed to be suitable for media containing particles, slurry, etc. Widely applicable to media pipelines such as food, medicine, petroleum, chemical, natural gas, steel, environmental protection, papermaking, etc.