Stable sealing gate valve

Abstract

The invention discloses a stable sealing gate valve. The stable sealing gate valve comprises a valve body and a gate plate. An adjusting ejecting table is arranged at one end of the inner wall of the valve body, and a fixing table is arranged at the other end of the inner wall of the valve body. The gate plate is arranged in the valve body through cooperation of the adjusting ejecting table and the fixing table. A compression spring is arranged between the fixing table and the gate plate. Sealing balls are arranged at the upper end and the lower end of the gate plate and evenly arranged on the upper side and the lower side of the gate plate. The end, arranged at the fixing table, of the gate plate is further provided with a sealing ring. The adjusting ejecting table comprises an ejecting rod and a nut. One end of the ejecting rod abuts against the gate plate, and the other end of the ejecting rod extends out of the valve body and is fixed through the nut. A sealing cover is arranged outside the nut. According to the scheme, the state that during vertical or inclined pipeline installing, original similar valve product floating valve bases are pressed through pressure of gate plates or media for a long term is overcome, the failure caused when the floating valve bases are pressed for a long term and do not float is avoided, the phenomenon of the sealing failure of the valve is eradicated, and the reliability of the both-way sealing of the inlet end and the outlet end of the valve is guaranteed.

Description

technical field [0001] The invention relates to a smooth sealing gate valve, which belongs to the technical field of gate valves. Background technique [0002] The gate valve has simple structure and reliable performance, and is widely used in petrochemical, refining, oil and gas, city gas and other flammable and explosive hazardous occasions. In the previous production of valve products, the gap between the casting and the width of the valve body fixing platform 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 tr...

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Problems solved by technology

[0002] The gate valve has simple structure and reliable performance, and is widely used in petrochemical, refining, oil and gas, city gas and other flammable and explosive hazardous occasions. In the previous production of valve products, the gap between the casting and the width of the valve body fixing platform 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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