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I. Basic structure of the gate valve: A gate valve is a type of valve that uses the lifting and lowering of a gate to shut off slurry; it features a simple structure, wear resistance, good sealing performance, and easy operation. Its basic structure includes a valve body, gate plate, packing, moving bearings, and manual operating device, etc. II. Why does a gate valve need to be turned half a turn? 1. Both the closing and opening of a gate valve involve the movement of the gate, and to open or close it, it is necessary to rotate it by a certain angle. Turning it half a turn is to ensure the sealing and stability of the valve. 2. Meanwhile, steel materials possess a certain degree of elasticity; rotating them back half a turn is done to prevent exceeding their elastic deformation limit, which could otherwise lead to damage to the screw rod. III. The function of turning half a turn: 1. To ensure the proper opening and closing of the valve. This is because the gate of a gate valve needs to rotate a specific angle in order to open and close, and half a turn is precisely the optimal angle to achieve this. 2. Ensure the valve’s sealing performance. The valve sealing surface makes tight contact with the seat sealing surface; turning it half a turn ensures full contact between the sealing surfaces, thereby achieving sealing of the valve. 3. Prevent valve damage. If the gate valve is not turned half a turn when it is opened or closed, this may cause the gate to get stuck or damaged, thereby affecting the valve’s normal service life. A gate valve is a common type of valve; turning it half a turn ensures its proper opening and closing, thereby improving the valve’s sealing performance and stability. Additionally, since steel materials have a certain degree of elastic deformation, turning the valve half a turn helps to prevent damage to the valve. When using gate valves, attention should be paid to their sealing performance and rotation angle; if there are any issues, they should be repaired or replaced promptly.