Use of seals in three parts of the valve

The use of seals in three parts of the valve Seals are also very important parts in the valve. The sealing function of a valve refers to the ability of each sealing part of the valve to prevent leakage of the mechanical sealing medium used in the kettle. It is the most important technical function index of the valve. There are three sealing parts of the valve: the touch place between the opening and closing parts and the two sealing surfaces of the valve seat; the place where the packing cooperates with the mechanical seal of the valve stem and the stuffing box; the joint between the valve body and the valve cover. During this period, the previous leakage is called internal leakage, which is generally referred to as lax closing, which will affect the ability of the valve to cut off the medium. For shut-off valves, internal leakage is not allowed. The leakage in the latter two places is called external leakage, that is, the medium leaks from the inside of the valve to the outside of the valve. Leakage will cause material loss, pollute the environment, and cause accidents in severe cases. Regarding flammable, explosive, toxic or radioactive media, leakage is not allowed, so the valve must have a reliable sealing function.