Parallel gate valve

Abstract

The invention relates to a parallel gate valve comprising a valve body, a valve cover, a valve seat, a valve rod and a valve plate assembly, wherein the valve cover is arranged on the top of the valve body; the upper part of the valve body is provided with an upper cavity, and the lower part of the same is provided with a flow passage; the valve seat is arranged in the flow passage and provided with a valve plate groove matched with the valve plate assembly; the valve plate assembly is arranged in the valve plate groove; the valve rod penetrates through the upper cavity from the valve cover; the valve rod and the valve cover are sealed by utilizing a sealing structure; and the lower end of the valve rod is connected with the upper part of the valve plate assembly. The parallel gate valve is characterized in that the valve plate assembly comprises a left valve plate, a right valve plate, a middle spring, a valve plate sleeve, an upper fixing ring and a lower fixing ring, wherein the left valve plate and the right valve plate are symmetrically arranged; the abutted surface of the left valve plate and the right valve plate is provided with a spring cavity; and the middle spring is arranged in the spring cavity. The invention has the advantages of ingenious, compact and reasonable structure, long service life, better sealing effect and low manufacture and maintenance cost, and can not generate the top opened phenomenon of the valve plate assembly when the valve plate assembly is opened, thereby preventing the drag mark phenomena of the valve plate assembly and the valve seat.

Description

technical field [0001] The invention relates to a valve, in particular to a parallel gate valve suitable for high temperature and high pressure environment. Background technique [0002] The gate valve is a valve commonly used in the pipeline system, which is used to connect or cut off the medium in the pipeline system. The opening and closing part of the gate valve is the valve plate. At present, the gate valve with relatively mature technology in China is the wedge gate valve. When the wedge gate valve works in a high temperature and high pressure environment, it is prone to jamming. Therefore, the gate valves used in high temperature and high pressure environments at home and abroad generally choose parallel gate valves, such as high temperature and high pressure vent gate valves used in oil refining and hydrogenation units and high temperature in power stations. High-pressure steam switch gate valves are all imported parallel gate valves. An intermediate spring is loa...

AI Technical Summary

Problems solved by technology

However, most of the two valve plates and the valve plate sleeves of the current parallel gate valve are fitted with steps. Open at a certain angle, in an inverted figure-eight shape, when the valve plate assembly is closed down, it will cut the valve plate and seat downwards, resulting in strain on the valve plate and seat

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