Valve body of knife type gate valve

Abstract

The invention relates to a valve body of a knife type gate valve. The valve body of the knife type gate valve comprises a valve main body, an opening enabling a flashboard to be inserted into the valve main body conveniently is reserved in the upper end of the valve main body, and two valve walls of the valve main body are both provided with round holes. First ejection blocks are arranged on two sides of the inner side surface of one valve wall, the ends, not connected with the corresponding valve wall, of the first ejection blocks are planes, and the connecting line between the two ejection blocks and the transverse diameter line of the round holes coincide. The valve body of the knife type gate valve is characterized in that second ejection blocks are arranged below the two first ejection blocks respectively and connected with the valve wall where the two first ejection blocks are located, the axial height of the second ejection blocks is larger than that of the first ejection blocks, and a gap bringing convenience to passing of a valve plate is reserved between the second ejection blocks and the other valve wall. The ends, not connected with the corresponding valve wall, of the second ejection blocks are wedge-shaped surfaces, and the axial height of each wedge-shaped surface is gradually decreased from the outer side to the inner side of the wedge-shaped surface. By means of the valve body, the sealing performance of the knife type gate valve is greatly improved. The valve body is particularly suitable for pipelines used for conveying viscous liquid in the paper making industry and the sewage treatment industry.

Description

technical field [0001] The invention relates to a valve body. Specifically, it is the knife-type gate valve body in the pipeline used to transport viscous liquids in the papermaking and sewage treatment industries. Background technique [0002] At present, the valve bodies of knife gate valves in the pipelines used to transport viscous liquids in industries such as papermaking and sewage treatment are traditional valve bodies. This traditional valve body includes a valve body, the valve body is a plate-shaped cavity structure, its lower part is arc-shaped, and its upper end has an opening for the gate plate to be inserted into the valve body. A round hole matching the diameter of the pipeline, the center of the round hole coincides with the center of the circular arc at the lower part of the valve body. There are first jacking blocks on both sides of the inner surface of one of the valve walls in the two valve walls. The end of the first jacking block that is not connected...

AI Technical Summary

Problems solved by technology

However, the distance between the top block and the valve wall on the opposite side is slightly larger than the thickness of the valve plate, which will reduce the sealing effect when the valve is closed

On the other hand, even if the distance between the top block and the valve wall on the opposite side is just equal to the thickness of the valve plate during the production process, as the use time increases, due to the opening and closing of the valve, the distance between the top block and the valve There will be gaps between the plates due to wear, which will reduce the sealing effect

It can be seen that the knife-type gate valve with this valve body has poor sealing performance.

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