Valve plate of gate valve and method for manufacturing the same

Abstract

The invention provides a valve plate for a gate valve and a manufacture method thereof, belonging to the valve technical field. The invention solves the problems that a sealing material of the valve plate of the prior gate valve is easily separated from the valve plate, and the method for manufacturing the valve plate of the gate vale has technical problems, such as complicated processing process and so on. The valve plate of the gate valve comprises a copper plate and a rubber inclusion coated and fixed outside the copper plate, wherein, the copper plate is provided with a plurality of through holes; the rubber inclusion is formed by a left part and a right part; a plurality of connectors passing through the through holes are arranged between the left part and the right part of the rubber inclusion; the connectors, the left part and the right part of the rubber inclusion are connected into a whole. The method for manufacturing the valve plate comprises the following steps of: a. opening the through holes; b. connecting a choke plug; c. forming, which is to place the copper plate in a mould, add solid rubber in the mould, heat the copper plate and the solid rubber in the mould to make the solid rubber melted into a liquid state, evenly coated on the outer surface of the copper plate and injected in the through holes of the copper plate, so that the valve plate is formed after cooling. The valve plate for the gate valve has the advantages of firm connection, simple structure, large withstood pressure of the gate valve, simple processing process, low manufacturing cost and so on.

Description

technical field [0001] The invention belongs to the technical field of valves, and relates to a valve plate and a manufacturing method thereof, in particular to a valve plate of a gate valve and a manufacturing method thereof. Background technique [0002] Gate valves are widely used in various media pipelines in the industrial field because of their simple structure and reliable sealing performance. However, due to different media, the requirements for gate valves are also different. During the switching process of the gate valve, the most likely to wear is the sealing contact surface between the valve body and the valve plate, which is a key part that affects the sealing performance of the gate valve. The general method of making the valve plate of the gate valve is: apply adhesive on the copper sheet of the valve plate, and then stick the sealing material on it. This method causes the connection between the sealing material and the valve plate is not very firm. Once the g...

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Problems solved by technology

The general method of making the valve plate of the gate valve is: apply adhesive on the copper sheet of the valve plate, and then stick the sealing material on it. This method causes the connection between the sealing material and the valve plate is not very firm. Once the gate valve is used in In places with high pressure and high temperature, the sealing material is easily separated from the valve plate, resulting in leakage of the gate valve

[0003] In order to solve the problem that the sealing contact surface between the valve body and the valve plate is easy to wear, the State Intellectual Property Office of the People's Republic of China has disclosed a patent document of a sealed gate valve (patent number: ZL99249656.X), including the valve body, valve The sealing surfaces of the stem, valve plate, handwheel, valve body and valve plate are all cast curved surfaces, and the cast sealing surface of the valve plate and other outer surfaces are lined with a layer of soft sealing material, which is matched with the cast curved surface of the valve body for sealing

[0004] The defect of the gate valve is that the connection structure between the sealing material and the valve plate is that the sealing material is lined on the valve plate, which leads to a relatively low combination rate between the sealing material and the valve plate. , the sealing material is easy to fall off from the valve plate, resulting in leakage of the gate valve, and such a structure is also easy to cause wear of the sealing material, and this patent does not solve the shortcomings of the existing valve plate manufacturing method of the gate valve

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