Control valve with bellows reverse pressure-bearing sealing structure

Abstract

The invention relates to a control valve with a bellows reverse pressure-bearing sealing structure. The control valve comprises a valve body, wherein a sleeve is arranged in the valve body, the sleeve and the valve body are sealed by a valve body gasket, and the sleeve and a valve cover are sealed by a valve cover gasket; a valve core is installed in the sleeve, the valve core is fixedly connected with a valve rod through a screw thread; one end of a bellows is welded with the valve rod and the valve core; the bellows, the valve rod and the valve core are installed in the locating slot of the valve cover and then are welded and fixed; the valve cover and the valve body are connected together by a gland bush by means of a bolt and a nut; the upper end part of the valve cover is provided with a sealed core plug; and the valve rod and the valve cover are sealed by a filler component. The invention has the advantages that the bellows in the valve cover is fixed with the valve rod by welding, and the other end of the bellows is fixed with the valve cover by welding, thus bearing pressure by utilizing inner parts, achieving good sealing effect, avoiding medium leakage in the valve body, ensuring use safety, simplifying structure and reducing production and maintenance cost.

Description

technical field [0001] The invention relates to a regulating valve, in particular to a regulating valve with a bellows reverse pressure-bearing sealing structure. Background technique [0002] With the development of the economy, the environmental pollution is becoming more and more serious, and human beings have gradually realized the importance of protecting the environment. Therefore, the design process of industrial products must adhere to the principle of environmental protection design, and try to avoid pollution to the environment. As a common product in the industrial field, valves also have to face the problem of how to prevent medium leakage during use, especially for flammable, explosive, and radiation-prone media that must ensure zero leakage. At present, a better sealing method is to use corrugated Tube sealed. The existing corrugated pipe installation is commonly used in the normal installation method, that is, the pressure-bearing form of the bellows is exte...

AI Technical Summary

Problems solved by technology

The existing corrugated pipe installation is commonly used in the normal installation method, that is, the pressure-bearing form of the bellows is external pressure, but this installation method has hidden dangers, and the product structure is also relatively complicated. If the sealing gasket on the bellows is damaged or not compressed, it will cause the medium Leakage, which is likely to have disastrous consequences, seriously pollute the environment and cause huge economic losses

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