Ball valve

Abstract

The invention discloses a ball valve, which comprises a valve body, a valve rod and a valve plug, wherein the valve body is internally provided with a vertical valve rod installation channel, the valve plug is arranged inside the valve body, the valve rod is arranged in the valve rod installation channel, one end of the valve rod is connected with the valve plug, the other end of the valve rod isprovided with a handle, and a tetrafluoroethylene gasket is sleeved on the valve rod. The ball valve is characterized in that an annular bulge is arranged on the valve rod along the circumference direction and is provided with an annular groove along the circumference direction, and an O-shaped ring is sleeved in the annular groove. The ball valve is easy to assembly, has better sealing property,and can be suitable for occasions with high sealing property requirement, which is used for conveying dangerous media.

Description

technical field [0001] The invention relates to a valve, in particular to a ball valve. Background technique [0002] The ball valve came out in the 1950s. With the rapid development of science and technology, the continuous improvement of production technology and product structure, it has rapidly developed into a major valve category in just 40 years. In western industrially developed countries, the use of ball valves is increasing year by year. In my country, ball valves are widely used in petroleum refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electric power, municipal, steel and other industries. occupies a pivotal position in the national economy. [0003] China's authorized announcement number is CN2670696Y, and the utility model patent dated January 12, 2005 discloses a ball valve, including a valve body, a valve core, a valve stem and a handle, the valve core is located in the valve body, the valve stem and the valve...

AI Technical Summary

Problems solved by technology

[0003] China's authorized announcement number is CN2670696Y, and the utility model patent dated January 12, 2005 discloses a ball valve, including a valve body, a valve core, a valve stem and a handle, the valve core is located in the valve body, the valve stem and the valve body There is a sealing ring between them, and the inner end of the valve stem is connected with the valve core. The valve body has a cylindrical limiting cylinder at the outer end of the valve stem, and the side of the limiting cylinder is perpendicular to the valve stem. There is a strip-shaped limiting hole in the axial direction, the end of the handle passes through the limiting hole, and is firmly connected with the outer end of the valve stem. The ball valve structure provided by this utility model is adopted, although the valve stem of this kind of ball valve can be increased. Thick, the connecting end of the handle and the valve stem can adopt a cylindrical shape to improve its mechanical strength, which improves the product quality of the ball valve and prolongs the service life. However, because only one sealing ring is set on the valve stem, its sealing effect is relatively weak. Therefore, it cannot be applied to occasions with high sealing requirements and dangerous medium delivery. To sum up, this kind of ball valve mainly has the defects of poor sealing performance, which is easy to cause medium leakage and cannot be applied to occasions with high sealing requirements and dangerous medium delivery. with questions

Images