What does butterfly valve eccentric mean?

Eccentric butterfly valve refers to the situation where the valve stem of the butterfly valve does not coincide with the central axis of the valve body. Butterfly valve is a commonly used valve for controlling fluid. It controls the on-off of fluid and adjusts the flow rate by rotating the valve disc. The eccentricity of the butterfly valve is an important parameter in the design of the butterfly valve, which affects the performance and use effect of the butterfly valve.

The main reason for the eccentric butterfly valve is to reduce the operating torque and improve the sealing performance. When the valve disc does not coincide with the central axis of the valve body, the valve disc will generate an eccentric moment during the process of closing or opening, which will make the valve disc stay in the open or closed position more stably and reduce the operating torque. At the same time, the eccentric design can also increase the contact pressure between the valve disc and the sealing surface, improving the sealing performance and reducing the possibility of leakage.

The eccentric design of the butterfly valve needs to consider the flow characteristics of the fluid and the working conditions of the valve. In the design process, it is necessary to determine the eccentric distance between the valve disc and the central axis of the valve body. This distance is usually determined according to parameters such as fluid flow rate, pressure and temperature. The selection of the eccentric distance needs to comprehensively consider the mechanical characteristics of the fluid and the structural strength of the valve to ensure that the valve can operate normally and have good sealing performance during the working process.

The advantage of the eccentric design of the butterfly valve is that it can reduce the operating torque, improve the sealing performance, and can adapt to the fluid control requirements under different working conditions. However, butterfly valve eccentricity also has some limitations. First, an eccentric design increases the manufacturing cost and complexity of the valve. Secondly, in some working conditions of high temperature, high pressure or corrosive fluid, the eccentric design may be limited, and other measures need to be taken to ensure the performance and reliability of the valve.

In short, butterfly valve eccentricity is a common valve design method, which improves the performance and use effect of the valve by setting the eccentric distance. In practical applications, it is necessary to select a suitable eccentric design scheme according to specific working conditions and requirements to ensure that the valve can work stably and reliably, and has good control and sealing performance.