Flat gate valve with compound seal valve seat structure

Abstract

The invention relates to a flat gate valve with a compound seal valve seat structure. The flat gate valve comprises a valve body, a gate segment, a valve cover, a valve seat seal assembly and a valverod; the valve cover is fixedly connected with the valve body; the gate segment is arranged in the valve body and is in seal fit with the valve seat seal assembly; the valve seat seal assembly comprises a valve seat body, a seal pressing ring, a primary seal ring and a secondary seal ring; the seal pressing ring, the primary seal ring and the secondary seal ring are installed on the valve seat body; the seal pressing ring, the primary seal ring and the secondary seal ring are sequentially arranged from a medium channel to the outside; the primary seal ring is compacted in an annular hole of the valve seat body by the seal pressing ring; the bulged end of the seal pressing ring is flush with that of the secondary seal ring; the bulged end of the primary seal is higher than that of the sealpressing ring; and the primary seal ring is made of rubber. Seal is mainly completed by the primary seal ring, and the secondary seal ring and the seal pressing ring immediately seal when the primaryseal ring is damaged, so that the valve continues to work, and the seal property is more reliable; and a rubber ring serves as primary seal, the seal specific pressure is small, and a rubber materialis more wear-resistant, so that the service life of the valve is prolonged.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a flat gate valve with a composite sealing valve seat structure. Background technique [0002] like figure 1 As shown in the figure, the soft sealing valve seat structure of the existing flat gate valve is to press a single rectangular engineering plastic (No. 11) into the valve seat body (No. 41) through external force, and the engineering plastic and the gate (No. 2) form a seal vice, which completes the sealing by its own deformation. The prior art has the following disadvantages: [0003] ①The sealing structure is single, if the sealing material is damaged, the sealing of the valve will be damaged directly; [0004] ② In direct contact with the medium, it is easy to be eroded; [0005] ③ In direct contact with the medium, it is easy to be scratched by impurities in the medium; [0006] ④Easy to wear; [0007] ⑤ The sealing specific pressure is large, and it is not easy t...

AI Technical Summary

Problems solved by technology

[0003] ①The sealing structure is single, if the sealing material is damaged, the sealing of the valve will be directly damaged;

[0004] ② In direct contact with the medium, it is easy to be eroded;

[0005] ③It is in direct contact with the medium and is easily scratched by impurities in the medium;

[0006] ④ easy to wear;

[0007] ⑤ The sealing specific pressure is large, and it is not easy to seal;

[0009] ⑦The friction coefficient of engineering plastics is relatively large, so the opening torque of the valve is relatively large, which leads to an increase in the driving device, thereby increasing the cost of the valve

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