A plug valve is a control valve used to regulate the flow and pressure of a fluid. This universal valve has a simple structure, convenient use, wide adjustment range, and a wide range of usage scenarios. The plug valve is composed of a valve body, a valve cover, a valve, and a transmission mechanism. The valve of a plug valve is a cylindrical rotating body that regulates the flow of fluid through rotation. There is usually a V-shaped channel on the circumferential surface of the valve. When the valve rotates, the opening of the V-shaped channel can be aligned or misaligned with the fluid channel to regulate flow. When the valve is fully closed, both sides of the V-shaped channel are completely isolated from the fluid channel, achieving complete closure. The valve body and valve are both made into cylindrical shapes to reduce fluid pressure drop and flow resistance loss. The channel of the valve can be straight or angled, where the flow resistance of the straight channel is smaller, b…