Enhancing Efficiency: In-Depth Analysis of Butterfly Valve Structure

I. Basic structure of butterfly valve

Butterfly valve is mainly composed of valve body, valve disc (or butterfly plate), valve shaft, bearing, sealing device, operating mechanism and some auxiliary parts. These components work together to ensure that the butterfly valve can open and close smoothly and realize the function of fluid control.

‌Valve body‌: Provide support and protection for the entire butterfly valve, usually a cylindrical channel with a smooth interior to reduce fluid resistance.

‌Valve disc‌: The key component of the butterfly valve, shaped like a disc, rotates around the valve shaft. Its rotation angle determines the degree of opening of the valve.

‌Valve shaft‌: Connects the operating mechanism and the valve disc, responsible for transmitting power to rotate the valve disc.

‌Bearing‌: Ensures that the valve shaft can rotate smoothly and reduces friction and wear.

‌Sealing device‌: Ensures the sealing performance of the butterfly valve in the closed state, usually made of elastic materials such as rubber or polytetrafluoroethylene.

‌Operating mechanism‌: Used to control the rotation of the valve disc, which can be manual, electric, pneumatic and other forms.

II. Working principle of butterfly valve

The working principle of butterfly valve is based on the rotation of valve disc. When the operating mechanism drives the valve shaft to rotate, the valve disc rotates accordingly, thereby changing the degree of opening of the fluid channel. When the valve disc rotates 90°, the valve is in a fully open state; when it rotates to 0°, the valve is completely closed. By adjusting the rotation angle of the valve disc, the medium flow rate can be flexibly controlled.

III. Classification and characteristics of butterfly valves

Butterfly valves can be divided into concentric butterfly valves, single eccentric butterfly valves, double eccentric butterfly valves and triple eccentric butterfly valves according to their structural characteristics. Each type has its unique design features and scope of application.

‌Concentric butterfly valve‌: The valve stem axis, the center of the butterfly plate, and the center of the body are in the same position. The structure is simple but the sealing performance is poor. It is suitable for low pressure and normal temperature occasions.

‌Single eccentric butterfly valve‌: The valve stem axis deviates from the center of the butterfly plate, which reduces the extrusion and scratching between the butterfly plate and the valve seat, improves the sealing performance, but there is still scratching.

‌Double eccentric butterfly valve‌: On the basis of single eccentric, the valve stem axis also deviates from the center of the body, further reducing the extrusion and scratching between the butterfly plate and the valve seat, improving the sealing performance and service life. It is the most widely used butterfly valve type at present.

‌Triple eccentric butterfly valve‌: On the basis of double eccentric, the conical axis of the valve plate sealing surface is deviated from the cylindrical axis of the body, realizing torsion sealing, fundamentally changing the sealing structure, improving the sealing performance, and suitable for high temperature and high pressure occasions.

IV. Key measures to improve the efficiency of butterfly valve use

‌Reasonable selection‌: Select the appropriate butterfly valve type, specification and material according to the nature of the medium, working pressure, working temperature, flow requirements, etc.

‌Correct installation‌: Install in strict accordance with the technical requirements and installation specifications of the valve to ensure that the sealing surface, connecting flange and other key parts of the valve are correctly connected.

‌Regular maintenance‌: Develop a detailed maintenance plan, including cleaning, lubrication, checking the sealing performance, replacing worn parts, etc., to ensure the long-term stable operation of the butterfly valve.

‌Optimize operation‌: Operators should reasonably control the opening and closing speed and force of the valve according to the characteristics and working conditions of the valve, and avoid frequent rapid opening and closing and excessive force operation.

‌Adopt advanced technology‌: Such as intelligent valve positioner, wireless sensor technology, etc., to achieve more accurate flow control and real-time monitoring of the working status of the valve.

As an important fluid control device, the internal structure and working principle of the butterfly valve are crucial to improving the efficiency of use. By deeply understanding the structural characteristics and working principle of the butterfly valve, and taking corresponding measures for reasonable selection, correct installation, regular maintenance, optimized operation and the use of advanced technology, we can give full play to the performance advantages of the butterfly valve and ensure that it can work stably and reliably under various working conditions.