What is the difference between valve-type arresters and tube-type arresters?

Tubular arresters, also known as vented arresters, are capable of interrupting large currents; they are suitable for installation on the incoming lines of substations as well as at certain points along the lines where the insulation is weak. However, due to the inherent structural characteristics of exhaust-type arresters, their spark gaps are exposed to the atmosphere, resulting in unstable electrical performance. So these types of surge arresters are rarely used. Valve-type arresters consist internally of spark gaps and nonlinear resistance elements made of silicon carbide, and they possess excellent protection properties; as a result, they are widely used in circuits and electrical equipment across various voltage levels. Valve-type arresters are further divided into ordinary valve-type arresters and magnetically blown valve-type arresters; the former has a simple shape for its spark gap, and its resistance elements are manufactured using a low-temperature firing process at around 320 degrees ； The latter uses electromagnetic force to drive the arc, thereby enhancing the arc-quenching and current-carrying capabilities of the magnetic blowout gap. Its resistance elements are fired at a high temperature of around 1320 degrees, allowing it to release large amounts of overvoltage energy; as a result, this type of arrester performs better than ordinary valve-type arresters, and is particularly suitable as an overvoltage protection device for ultra-high voltage power stations.