What is the core function of a gate valve

　　Gate valve is a type of valve that uses a lifting gate to achieve pipeline connection and disconnection. Its core function is to act as a shut-off valve, used to fully open or completely close the flow of medium in the pipeline. Gate valves do not have the function of regulating flow and are mainly suitable for situations that do not require frequent operation and require minimal flow resistance.

1、 Realize complete cutting off of the medium

The core function of a gate valve is to achieve reliable medium cut-off in pipelines. When the gate is completely lowered and pressed onto the valve seat, it can effectively block the flow of various media such as water, oil, steam, gas, etc., and has good sealing performance. In the fully open state, the gate completely exits the flow channel, allowing the medium to pass unobstructed with almost zero flow resistance and minimal pressure loss. This feature makes gate valves particularly suitable for long-distance pipelines that are sensitive to pressure loss, such as main water pipes and oil pipelines.

2、 Suitable for large-diameter pipelines

Another core function of gate valves is to be suitable for large-diameter pipelines. Compared to other types of shut-off valves such as globe valves and ball valves, gate valves have a relatively simple structure, easy manufacturing, and lower cost under large-diameter conditions. Therefore, in large-diameter pipelines above DN200, gate valves are commonly used as shut-off valves, widely used in urban water supply main pipes, sewage treatment plant inlet and outlet pipes, industrial circulating water systems, and other occasions.

3、 Bidirectional sealing function

Gate valves have good bidirectional sealing ability, which means that regardless of which direction the medium flows in, the gate valve can reliably cut off. This feature allows gate valves to be installed without special attention to the flow direction of the medium, with flexible installation direction, reducing the possibility of installation errors. The advantage of gate valves is particularly evident in pipelines that require bidirectional flow or may have a change in flow direction.

4、 Tolerate harsh working conditions

Gate valves are suitable for harsh working conditions such as high temperature and high pressure. Cast steel gate valves can withstand high temperature steam, stainless steel gate valves can be used for corrosive media, and hard sealed gate valves can be used for applications containing granular media. Gate valves play an important role in cutting off steam pipelines in thermal power plants, high-temperature oil pipelines in petrochemicals, and tailings transportation pipelines in mines.

summary

The core function of a gate valve can be summarized in one sentence: to provide a nearly zero resistance medium channel when fully open, and to achieve reliable medium cutoff when fully closed. It is not suitable for regulating flow or frequent opening and closing, but in working conditions such as large diameter, long distance, high pressure, and high temperature, gate valves are an irreplaceable choice for shut-off valves. When selecting, attention should be paid to selecting suitable materials based on the characteristics of the medium. Open stem gate valves are easy to observe the switch status, while concealed stem gate valves are suitable for installation in situations with limited space.