The Working Principle and Structural Characteristics of Butterfly Valves

Butterfly valve, as an important industrial valve, plays a crucial role in fluid control systems in terms of its working principle and structural characteristics. The following is a detailed explanation of the working principle and structural characteristics of butterfly valves.

Working Principle of Butterfly Valve 

The working principle of butterfly valves is based on their unique disc-shaped opening and closing components - butterfly plates. The butterfly plate rotates around its own axis inside the valve body, and achieves valve opening, closing, and flow regulation by changing the area of the fluid channel. Specifically, when the butterfly plate rotates to 0 °, the valve is in a closed state and the fluid channel is completely cut off; When the butterfly plate rotates to 90 °, the valve is fully open, the fluid channel is fully opened, and the fluid can pass smoothly. During the rotation process, the sealing surface between the butterfly plate and the valve seat will produce a certain sealing effect, thereby ensuring the sealing performance of the valve.

The relationship between the opening of butterfly valves and flow rate varies linearly, which gives butterfly valves a unique advantage in flow regulation. In addition, the butterfly valve has a fast opening and closing action and is easy to operate, making it very suitable for situations that require quick cutting or adjustment of flow.

Structural Characteristics of Butterfly Valve   

Simple structure, small size, and light weight: Butterfly valves are composed of a few parts such as valve body, butterfly plate, and valve stem, with a compact structure that is easy to install and maintain. Compared to other types of valves, butterfly valves have significant advantages in volume and weight.

Good fluid control characteristics: When the butterfly valve is fully opened, the thickness of the butterfly plate is the only resistance for the medium to flow through the valve body, resulting in a small pressure drop and good fluid control characteristics. This makes butterfly valves widely used in low-pressure pipeline systems.

Multiple sealing forms: Butterfly valves have various sealing forms, including soft seals and metal hard seals. Soft sealed butterfly valves use elastic materials such as rubber as sealing surfaces, suitable for normal temperature and low pressure environments; Metal hard sealed butterfly valves use metal materials as sealing surfaces and are suitable for high temperature and high pressure environments.

There are various connection methods: The connection methods of butterfly valves  include flange connection, clamp connection, welding connection, and other forms. The appropriate connection method can be selected according to actual working conditions and needs.

Easy to implement automation control: Butterfly valves can be easily combined with various driving devices (such as electric devices, pneumatic devices, etc.) to achieve remote control and automation control. This greatly improves the efficiency and convenience of using butterfly valves.

In summary, butterfly valves play an important role in fluid control systems due to their unique working principles and excellent structural characteristics. Whether used for flow regulation in low-pressure pipeline systems or for medium cutoff and sealing in high-temperature and high-pressure environments, butterfly valves can provide reliable performance and stable operation.

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