A plug body with a through hole is used as a valve for the opening and closing member. The plug body rotates with the valve stem to achieve the opening and closing action. The small unfilled plug valve is also known as the plug valve "Cock". The plug body of the plug valve is mostly a cone (also has a cylinder), and cooperates with the conical hole surface of the valve body to form a seal pair. The plug valve is the earliest type of valve, which has a simple structure, quick switch and low fluid resistance. The ordinary plug valve is sealed by the direct contact between the finished metal plug body and the valve body, so the sealing performance is poor, the opening and closing force is large, and it is easy to wear, and can usually only be used for low pressure (not higher than 1 MPa) and small. Caliber (less than 100 mm).
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