The difference between eccentric butterfly valve and ordinary butterfly valve

First, the structure and characteristics of eccentric butterfly valve

The eccentric butterfly valve is optimized for the characteristics of medium flow during design, and its main features include the following aspects:

1. Eccentric structure

Eccentric butterfly valve adopts eccentric structure, so that the valve will first leave the sealing surface at the bottom of the sealing surface when it is opened, and then rotate to the fully open position. This structure can reduce the friction on the sealing surface, reduce the operating force, and also reduce the wear degree between the sealing surface and the bottom sealing surface, thereby improving the service life.

2. Unique sealing structure

The eccentric butterfly valve has a special sealing structure, which adopts a double-layer sealing structure, that is, a combination of metal seal and elastic seal, and works statically under high pressure difference and high temperature. It can achieve a metal seal before the valve is closed and an elastic seal after the valve is closed. This sealing structure makes the eccentric butterfly valve more stable in industrial production and can prevent medium leakage.

3. Reliable operation performance

Eccentric butterfly valves perform well in terms of operating performance. It has good regulating performance, can perform well at large caliber, high pressure difference and high temperature, and can adapt to the flow requirements of different media. In addition, its operating force is relatively small, can achieve remote operation, reduce the operating intensity of workers.

Second, the structure and characteristics of ordinary butterfly valve

Compared with the eccentric butterfly valve, the ordinary butterfly valve adopts a simple design structure, which is suitable for some relatively simple industrial scenes and general civil occasions. Its main features are as follows:

1. Simple structure

The structure of the ordinary butterfly valve is relatively simple, consisting of two symmetrical sealing surfaces and a valve stem. During operation, the valve is opened and closed by rotating the valve stem, and the sealing surface is also sealed by adjusting the relative position of the valve stem.

2. Narrow scope of application

The application range of ordinary butterfly valves is relatively narrow, and can only be applied in some relatively simple industrial occasions and general civil occasions, and is not suitable for use under high pressure difference and high temperature. At the same time, its operation process is also more laborious, and it is not suitable for large caliber.

Third, eccentric butterfly valve and ordinary butterfly valve for different purposes

Because the eccentric butterfly valve has a series of distinct advantages, its application range is relatively wide. The eccentric butterfly valve is mainly used in the manufacturing process of petroleum, chemical industry, metallurgy, electric power, building materials, light industry, medicine and other industries, which can meet the stable working requirements under high pressure difference and high temperature, and is widely used in the adjustment and cut-off of various media flow.

In contrast, the scope of application of ordinary butterfly valves is relatively narrow, mainly used in some relatively simple industrial processes and general civil occasions. Such as sewage treatment, tap water network, air conditioning fans and other small industrial equipment.