Improved flat gate valve

Abstract

The invention relates to the field of flat gate valves, in particular to an improved flat gate valve. A valve seat is placed in a valve body; a valve plate is tightly matched with the valve seat; one end of a valve rod is connected with a gate plate, and other end of the valve rod is connected with an operating mechanism; a valve cover is fixedly connected with the valve body; the bottom of the cavity of the valve body is provided with a drain hole; tungsten carbide alloy protrusions are sprayed on sealed areas or / and guide areas on two sides of the gate plate; the appearance of the gate plate is an automatic positioning and guide structure; and the bottom end part of the gate plate is provided with an arc groove structure. The improved flat gate valve has the advantages that: a real hardsealed flat gate valve is realized through the tungsten carbide protrusions and can resist abrasion, scratch and scour of all granules except diamond, and the service life of the valve is prolonged. Compared with total spraying, the spraying cost is saved by 75 percent. Because the whole convex surface is made of a material (tungsten carbide), the grinding process becomes easier compared with a large plane inlaid by two materials.

Description

[technical field] [0001] The invention relates to the technical field of slab gate valves, in particular to an improved slab gate valve. [Background technique] [0002] The existing slab gate valve includes a valve body, a valve seat, a valve stem, a gate plate, a valve cover and an operating mechanism. It is connected with the gate plate, and its other end is connected with the operating mechanism, and the valve cover is fixedly connected with the valve body. When the gate is partially opened, the valve seat and the gate will withstand the strong washing of the high-pressure throttling medium. If the existing soft seal structure is used, the soft seal material of the valve seat is partially exposed to the medium and is quickly washed out of the pit by the medium, so that the sealing performance of the valve will be invalid after one opening. In addition, the existing gate and valve seat are also easily worn under the strong erosion of the high-pressure throttling medium, ...

AI Technical Summary

Problems solved by technology

If the existing soft sealing structure is used, the soft sealing material of the valve seat is partially exposed to the medium and is quickly washed out of the pit by the medium, so that the sealing performance will be invalid after the valve is opened once.

In addition, the existing gate and valve seat are easily worn under the strong erosion of the high-pressure throttling medium, which leads to defects such as reduced valve sealing performance and shortened service life.

[0003] In addition, the existing slab gate valve does not have a dust-proof structure for the valve seat, and the following defects will occur: small impurities in the medium will enter the bottom of the valve seat, causing the spring to fail and cause the valve to leak, and the operating torque of the valve will follow the impurities. The increase gradually increases, and finally the valve cannot be opened and closed normally, and the DBB function cannot be realized.

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