Flat gate valve sealing structure

Abstract

The invention discloses a flat gate valve sealing structure, which comprises a valve body and a gate plate, wherein a support table is arranged at one end of the inner wall of the valve body; a guide rail is arranged at the other end of the inner wall of the valve body; the gate plate is arranged in the valve body in cooperation with the guide rail through the support table; and the gate plate is further provided with a sealing ring. The support table and the guide rail are arranged in the valve body, and are used together, so that the valve can cling to the sealing ring surface of the gate plate under the action of pressure in the opening and closing processes of the valve so as to be sealed completely; the gate plate and the medium gravity are supported by the support table, so that the situation that floating valve seats of original valve products of the same type adopted in vertical or inclined pipelines and the like are compressed by the gate plate and medium pressure for a long time is eliminated, failure caused by non-floating of the floating valve seat which is compressed for a long time is avoided, the phenomenon of sealing failure of the valve is avoided, and bilateral reliable sealing of the inlet and outlet ends of the valve is ensured.

Description

technical field [0001] The invention relates to a flat gate valve sealing structure and belongs to the technical field of flat gate valves. Background technique [0002] The slab gate valve has simple structure and reliable performance. It is widely used in petrochemical, refining, oil and gas, city gas and other flammable and explosive hazardous occasions. The gap between the casting and the width of the guide rail groove of the valve body produced in the past is relatively large. In the process of opening and closing, the valve stem is not only affected by the pressure of the medium, but also by the gravity of the gate and the medium. When the valve is installed in a vertical pipeline or installed on the side of a horizontal pipeline, the opening and closing of the valve will be increased during the opening and closing process. The torque also accelerates the wear between the valve stem and the valve stem nut transmission pair, and even causes premature failure of the tran...

AI Technical Summary

Problems solved by technology

[0002] The slab gate valve has simple structure and reliable performance. It is widely used in petrochemical, refining, oil and gas, city gas and other flammable and explosive hazardous occasions. The gap between the casting and the width of the guide rail groove of the valve body produced in the past is relatively large. In the process of opening and closing, the valve stem is not only affected by the pressure of the medium, but also by the gravity of the gate and the medium. When the valve is installed in a vertical pipeline or installed on the side of a horizontal pipeline, the opening and closing of the valve will be increased during the opening and closing process. The torque also accelerates the wear between the valve stem and the stem nut transmission pair, and even causes premature failure of the transmission pair, so it needs to be improved

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