Three-eccentric center butterfly valve and manufacturing method thereof

Abstract

The invention provides a three-eccentric center butterfly valve and a manufacturing method thereof. The three-eccentric center butterfly valve adopts a design in which a valve base is separated from avalve body, and that is to say that a main valve body, an auxiliary valve body and the valve base are three independent components which can be separately machined, wherein the main valve body and the auxiliary valve body constitute the valve body; the valve base is arranged between the main valve body and the auxiliary valve body, and the main valve body, the auxiliary valve body and the valve base are welded into the complete valve. According to the technical scheme, the manufacturing difficulty and cost of the three-eccentric center butterfly valve are reduced.

Description

technical field [0001] The invention belongs to the technical field of butterfly valves, in particular to a welded surface-sealed triple-eccentric butterfly valve and a manufacturing method thereof. Background technique [0002] As a component used to realize the on-off and flow control of the pipeline system, the butterfly valve has been widely used in many fields such as petroleum, chemical industry, metallurgy, and hydropower. Due to the advantages of compact structure, flexible operation, reliable sealing and adjustable flow, the butterfly valve has been favored by the majority of users. In the choice of large diameter valves, people are more inclined to butterfly valves. Among them, the metal hard seal butterfly valve has been widely used in high temperature, high pressure, wear and corrosion and other working conditions, and its market demand is increasing year by year. [0003] At present, the valve body of large-diameter metal hard-sealed butterfly valves is usuall...

AI Technical Summary

Problems solved by technology

[0003] At present, the valve body of large-diameter metal hard-sealed butterfly valves is usually processed by casting or forging blanks. In the process of blank manufacturing, high mold costs, complicated manufacturing processes and long manufacturing cycles have caused high cost

[0004] In addition, the current large-diameter metal hard-sealed butterfly valve usually adopts the integrated design of the valve body and seat, which has two obvious disadvantages: First, due to the need for internal processing of the seat sealing surface, the manufacturing The cost is also high; second, for the integrated design of the valve body and seat, it is necessary to spray the corresponding material layer on the surface of the valve seat so that the material of the surface of the valve seat and the body of the valve body are different, resulting in a more complicated manufacturing process and resulting in higher manufacturing costs. also higher

[0005] To sum up, the main problem of large-diameter metal hard-sealed butterfly valves is that the manufacturing cost is relatively high, and it is difficult to popularize them in a large area.

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