During the installation of automatic butterfly valves, the sealing surface problem is one of the common faults, which directly affects the performance and reliability of the valve. Damage to the sealing surface or the presence of impurities is the main cause of leakage. Before the valve is installed, if the inner cavity of the valve is not thoroughly cleaned, the impurities on the sealing ring and the butterfly plate will interfere with the flatness of the sealing surface when the valve is closed, causing leakage. In addition, the aging or damage of the sealing material is also a factor that cannot be ignored. Commonly used sealing materials such as rubber and polytetrafluoroethylene may gradually lose elasticity, crack or break after long-term use or erosion by chemical media, significantly reducing the sealing performance. Improper operation can also cause uneven force on the sealing surface. For example, applying too much external force or closing the valve with excessive force may cause the sealing surface to deform and affect its sealing effect.
Difficulty in opening and closing the valve is another common problem, which is usually caused by looseness or damage to the connection between the valve stem and the butterfly plate, which will cause the valve stem to be unable to effectively drive the butterfly plate to rotate, affecting the normal opening and closing of the valve. The bending or deformation of the valve stem is often caused by collision during transportation or uneven force during installation. In addition, if the medium pressure is too high and exceeds the bearing capacity of the valve, it may cause excessive pressure on the internal seals and structural components, which may cause deformation or damage and affect the operation of the valve. The presence of foreign matter inside the valve is also a common factor that causes difficulty in opening and closing. Impurities, particles or corrosive substances in the medium may enter the valve during installation and hinder the normal movement of the butterfly plate.
Excessive operating torque is also an important issue that needs to be paid attention to during installation and use. Excessive friction between the valve stem and the packing may be caused by the packing gland being too tight or the packing being aged or damaged. The aging of the packing will not only reduce its sealing performance, but also affect the lubrication performance and increase the friction between the valve stem and the packing. Excessive friction between the butterfly plate and the valve body may be caused by factors such as inappropriate matching clearance between the butterfly plate and the valve body or excessive roughness of the butterfly plate surface. Improper installation of the valve will lead to uneven force and increase the operating torque. For example, if the valve body is installed non-concentrically with the pipeline, the valve stem will be subject to additional resistance during rotation, further increasing the difficulty of operation.
In addition, the vibration and noise problems of the valve will also affect the normal operation of the automatic butterfly valve. Too fast a medium flow rate may cause impact and turbulence, which in turn exerts a large impact force on the butterfly plate, causing vibration and noise of the valve. If the valve is not installed firmly and there is a gap between it and the pipeline or other equipment, resonance will occur when the medium flows, further exacerbating the generation of vibration and noise. Uneven gaps between the butterfly plate and the valve body will also cause uneven forces on the butterfly plate during rotation, causing vibration and noise. In addition, improper operation, such as opening or closing the valve too quickly, will cause sudden changes in the flow of the medium, resulting in impact and noise.
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