Ball valve

Abstract

The invention provides a ball valve simple in structure and having better tightness with extension pipes. The ball valve comprises a valve block, the extension pipes and a valve ball; the extension pipes extending into the valve block are disposed at two ends of a flow path of the valve block; the valve ball is disposed within the valve block; the valve ball is connected with the extension pipes through valve seats in ring shapes; the valve seats are embedded onto the inner peripheries of the ends, extending into the valve block, of the extension pipes; a seal ring is disposed between the periphery of each valve seat and the inner periphery of the corresponding end of the corresponding extension pipe.

Description

technical field [0001] The invention relates to a valve, in particular to a ball valve. Background technique [0002] The ball valve is connected or disconnected by rotating the ball in the valve body. With the rapid development of science and technology, the production process and product structure of ball valves have been continuously improved, and they have rapidly developed into a major valve category. In my country, ball valves are widely used in petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electric power, municipal, steel and other industries, and occupy a pivotal position in the national economy. Especially for welded ball valves, the stability of quality and high performance cannot be achieved by ordinary cast steel ball valves. The service life of fully welded ball valves is much longer than that of cast steel ball valves, so they are more widely used. [0003] In the existing technology, such as ...

AI Technical Summary

Problems solved by technology

Wherein, the valve seat 40 is tightly matched with the extension tube 20, thereby preventing the liquid in the pipeline from flowing out from between the extension tube and the valve seat. However, this requires high-precision machining of the valve seat and the extension tube. If the machining accuracy is low, Then there may be a gap between the valve seat and the extension pipe, so that there will be liquid leakage. In addition, due to wear or corrosion, there may also be a gap between the valve seat and the extension pipe, resulting in leakage.

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