Butterfly valves are classified according to structural form, mainly divided into several different types, each type has its unique characteristics and scope of application. The following is an analysis and summary of the most common types of butterfly valves classified by structural form:
1.Single eccentric butterfly valve (Eccentric Butterfly Valve): Eccentric butterfly valve is one of the most common types of butterfly valve. It has an eccentric shaft design, so that the valve seat and disc contact position away from the centre of the valve shaft, reducing the friction between the disc and the valve seat, reducing the operating torque, and improving the sealing performance.
2. Centric Butterfly Valve: Centric Butterfly Valve is a common type of butterfly valve, the rotational axis of the valve disc coincides with the centre line of the valve seat. It has a simple structure, easy to operate, and is suitable for general fluid control applications.
3. Double Eccentric Butterfly Valve (Double Eccentric Butterfly Valve): Double Eccentric Butterfly Valve is a further improved type on the basis of eccentric butterfly valve. It has two eccentric shafts, respectively, away from the central axis of the valve disc and the central axis of the valve seat, reducing the friction between the valve disc and the valve seat, improving the sealing performance and wear resistance.
4. Three eccentric butterfly valve (Triple Eccentric Butterfly Valve): three eccentric butterfly valve is further improved on the basis of double eccentric butterfly valve type. It has three eccentric shafts, respectively, away from the central axis of the valve disc, the central axis of the valve seat and the central axis of the pipeline, further improving the sealing performance and wear resistance, suitable for high temperature, high pressure and harsh conditions.
Summary
In the classification of butterfly valves according to structural form, the centre-sealed butterfly valve becomes the most basic choice with its simple structure and lower cost, which is suitable for general working conditions. Eccentric butterfly valves, especially double and triple eccentric butterfly valves, are more common in industrial applications with their better sealing performance and scope of application. When selecting butterfly valves, comprehensive consideration should be given to the specific working conditions, media characteristics and operational requirements to ensure that the butterfly valves can operate safely, stably and efficiently.
