The plug valve, as a widely used valve type in industrial fields, plays an important role in fluid control due to its unique structure and operating method. The main components of the plug valve include the valve body, plug body, and sealing ring, etc. Among them, the plug body is one of the key components of the plug valve, whose unique design allows the plug valve to achieve flow passage conduction and cutoff during opening and closing, thereby controlling the flow of fluid. Below, we will analyze in detail the principle of the conical plug body of the plug valve achieving flow passage conduction and cutoff by rotation.
The working principle of the plug valve
The working principle of the plug valve mainly involves changing the relative position between the plug body and the valve body by rotating the plug body to control the flow of fluid. The structure of the plug valve usually includes a conical plug body, valve body, valve stem, handle, and sealing device, etc. When the plug body is located at the center of the valve body, the flow passage at the top is blocked, and the fluid cannot pass through; when the plug body rotates to the side of the valve body, the fluid passage is opened, and the fluid can flow freely. Therefore, the opening and closing of the plug valve is achieved by the rotation of the plug body.
The structure and function of the conical plug body
The conical plug body in the plug valve is the key component for achieving flow passage conduction and cutoff. The conical plug body is usually made of metal material, with its head designed as a cone, matching the shape of the flow passage inside the valve body. When the plug body rotates, the head of the conical plug body will sequentially contact or detach from the surface of the flow passage inside the valve body, thereby changing the shape and size of the flow passage. This design allows the plug valve to achieve flow passage conduction and cutoff at different positions of the plug body rotation.
The process of achieving flow passage conduction and cutoff
Open flow passage: When the plug body rotates to be completely aligned with the side of the valve body, the head of the conical plug body is completely aligned with the flow passage inside the valve body, opening the fluid passage, and allowing fluid to flow freely. At this time, the plug valve is in the open state.
Cutoff flow passage: As the plug body continues to rotate, the head of the conical plug body gradually detaches from the flow passage inside the valve body, blocking the fluid passage, and the fluid cannot pass through. At this time, the plug valve is in the closed state.
Conclusion
The rotation of the plug valve’s conical plug body achieves the conduction and cutoff of the flow passage. This process not only depends on the relative position change between the plug body and the valve body, but also on the matching of the shape of the conical plug body with the flow passage inside the valve body. By precisely controlling the rotation angle of the plug body, precise control of fluid flow can be achieved, which is widely used in various industrial fields. The plug valve plays an important role in fluid control due to its simple structure, convenient operation, and good sealing performance.