The gate valve opening and closing part is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve is used as a cut-off medium. When it is fully opened, the entire flow channel is straight, and the pressure loss of the medium is minimal. According to the form of the sealing element, gate valves are often divided into several different types, such as: wedge gate valve, flat gate valve, parallel double-disc gate valve, wedge double-disc gate valve, etc. Gate valves are usually suitable for working conditions where frequent opening and closing is not required and the gate is kept fully open or fully closed. It is not suitable for use as a regulator or throttling. Different materials can be used for various media such as water, steam, oil, nitric acid, acetic acid, oxidizing media, urea, etc. The drive devices include handwheel, bevel gear, electric, pneumatic, etc.