Special eccentric ball valve for chemical engineering and preparation method of special eccentric ball valve

Abstract

The invention relates to a special eccentric ball valve for chemical engineering. The special eccentric ball valve comprises a valve body, an upper valve shaft, an eccentric valve element and a lower valve shaft, wherein the valve body is formed by connecting a middle valve body, a left valve body and a right valve body; the eccentric valve element is supported and fixed in the valve body through a large gland; mounting holes are respectively formed in the top surface and the bottom surface of the middle valve body; the large gland is mounted in the mounting holes; the upper valve shaft and the lower valve shaft respectively penetrate through the large gland and then are connected with the eccentric valve element; an upper bracket and a lower bracket are respectively mounted on the top surface and the bottom surface of the middle valve body; a bottom cover is mounted at the bottom end of the lower bracket; the upper bracket and the lower bracket respectively limit the large gland in the mounting holes; a ceramic sleeve, a filler and a filler gland are mounted in the large gland; a middle valve body sleeve is arranged on the inner wall of the middle valve body; a left valve body sleeve is arranged on the inner wall of the left valve body; a right valve body sleeve is arranged on the inner wall of the right valve body; a valve element bushing and a spherical crown are arranged on the eccentric valve element; and a spherical crown bushing is arranged on the spherical crown. The special eccentric ball valve for chemical engineering can be suitable for various high-temperature and high-corrosion environments, and is long in service life.

Description

technical field [0001] The invention relates to a valve, in particular to a special eccentric ball valve for chemical industry which can be used in harsh environment. [0002] technical background [0003] At present, there are many types of ball valves that cut off the medium in the pipeline, and the eccentric hemispherical valve is one of them. It is suitable for the control and transportation of media such as liquid, gas or slag removal in the pipeline. Its main function is to cut off, Distribute and change the flow speed and direction of the medium. The closing part of the eccentric hemispherical valve is a hemisphere. The sphere rotates around the center line of the valve body to achieve the purpose of opening or closing. It is widely used in steel, hydropower, sugar, paper, Municipal water supply, sewage treatment and other occasions, the effect is also very good. [0004] However, for example, when ball valves are used in sewage treatment, sugar, petrochemical, chemic...

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Problems solved by technology

[0010] Through the inventor's long-term practice research, it is found that although there are fluorine-lined or rubber-lined butterfly valves, fluorine-lined or rubber-lined ball valves, fluorine-lined or rubber-lined globe valves and fluorine-lined or rubber-lined diaphragm valves in the market, due to their The problem of the design structure is that a single liner is used, which is extruded and sealed. It is greatly affected by the medium, and the seal is easily damaged. It cannot adapt to some more difficult environments and has a short service life.

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