The fluorine lined valve factory explains the working principle of the three eccentric metal sealed butterfly valve

Fluorine lined valve factory Explain the working principle of the three eccentric metal sealed butterfly valve

A typical three eccentric metal sealed butterfly valve has two eccentricities on the valve stem and valve plate, and the sealing surfaces of the valve plate and valve seat are in the shape of an inclined truncated cone (this is the third eccentricity of the so-called three eccentricities). When the valve is closed, the valve plate is pushed forward due to eccentricity, and there is no friction between the valve plate and the valve seat during the closing process. The valve plate is directly pressed against the valve seat, ensuring the service life of the valve; In addition, due to the elasticity of the sealing ring of this valve (whether installed on the valve seat or valve plate), Fluorine lined DC globe valve Moreover, there is a small gap between the protrusion inside the elastic ring and the elastic ring, which can cause slight displacement of the elastic ring; clamp-on Fluorine-lined Butterfly Valve When the valve is closed, the elastic sealing ring can automatically move to a position with more uniform force under the action of the closing force; In addition, with a small amount of deformation of the elastic ring, the sealing ring at the valve seat is uniformly stressed, achieving a good sealing state.

Performance changes of butterfly valves with different eccentric structures

As the eccentricity of the valve plate increases and the thickness of the valve plate also increases, the resistance of fluid flowing through the three eccentric butterfly valve increases; As the eccentricity of the butterfly valve increases, PTFE lined valve The performance of valves also undergoes significant changes. From the comparison of four different structures of butterfly valves, it can be seen that the three eccentric butterfly valve can generate a significant pressure drop and can be used as a regulating valve; The pressure drop of fluid flowing through the valve increases with the increase of eccentricity; But compared with some other non butterfly valves, the pressure drop of the three eccentric butterfly valve is still relatively small. As the eccentricity of the butterfly valve changes, the sealing performance of the valve seat also changes, and the three eccentric butterfly valve has good sealing performance of the valve seat. As the number of eccentricities increases, the torque required for opening and closing the valve decreases, so the torque required for opening and closing the three eccentric butterfly valve is much smaller than other types of butterfly valves. With the change of eccentricity, the temperature and pressure rating range and applicable temperature range of the butterfly valve will also vary greatly. The applicable temperature and pressure rating range of the three eccentric butterfly valve is incomparable to other types of butterfly valves.

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