What is the difference between a fixed ball and a floating ball in a ball valve? ?

In a floating ball valve, the ball is floating; under the pressure of the medium, the ball can move to a certain extent and press against the sealing surface at the outlet end, thereby ensuring sealing at that outlet. 　　Floating ball valves are small in size, light in weight, simple in structure, and have good sealing performance. However, all the load exerted by the working medium on the ball is transmitted to the outlet seal, so it is necessary to consider whether the material of the seal can withstand the working load from the medium acting on the ball. 　　Features and performance of floating ball valves: Small size, light weight, simple structure. The ball has the ability to float freely, which helps ensure good sealing ； A ball valve uses a sphere with a circular opening as the closing element; driven by a valve stem, the sphere rotates 0–90 degrees around the center of the stem to carry out the opening and closing action ； It features a compact design and rapid switching; turning it 90 degrees closes the valve and shuts off the fluid in the pipeline ； The diameter of the spherical channel is the same as that of the pipeline, resulting in low flow resistance and high flow capacity ； The valve stem is of a downward-mounted type, which prevents accidents caused by the stem protruding and ensures safe use. 　　The ball of a fixed ball valve is fixed and does not move under pressure. Fixed ball valves are equipped with floating seat valves; under the pressure of the medium, the seat moves, causing the sealing ring to press tightly against the ball in order to ensure a secure seal. Bearings are usually installed on the upper and lower axes of the sphere, resulting in low operating torque; it is suitable for high-pressure and large-diameter valves. 　　Features and Performance of Fixed Ball Valves Fixed ball valves are suitable for use in various pipelines under medium and high pressure, and are used to shut off or connect the fluid flowing through these pipelines. By choosing different materials, they can be utilized with a wide range of fluids such as water, steam, oils, liquefied gas, natural gas, coal gas, nitric acid, acetic acid, oxidizing agents, and urea. They are widely applied in industries such as petrochemicals, power generation, and water management. The common driving methods for fixed ball valves are worm gear drive, manual operation, electric drive, and pneumatic drive. Most fixed ball valves are flanged, but there are also welded fixed ball valves. 　　Simply put, the main difference between a fixed ball valve and a floating ball valve is as follows: a. In a floating ball valve, the spherical valve element rotates freely between two sealing rings located on the valve stem. 　　b. Fixed ball valve – a ball valve in which the ball element is connected to the valve stem and rotates around the center of the stem; it features a floating ball and an elastic, movable sleeve-shaped seat.