The triple-eccentric butterfly valve refers to a valve with an additional angular offset based on the double-offset structure. The main function of this angular offset is to ensure that, during the opening or closing operation, any point on the sealing surface of the seal ring and valve seat quickly disengages or contacts, resulting in essentially frictionless operation. It can achieve all-metal sealing. As the closing pressure increases, the valve tightens, improving the sealing performance, reducing the opening and closing torque, extending the service life, and allowing for repeated operations. It has strong pressure resistance, high-temperature endurance, a wide range of applicable operating conditions, and can be used for flow control. It is widely used in industries such as petroleum, chemicals, oil storage, metallurgy, and power generation.