External damage is a common obstacle in the common failure of valve.

External damage due to material defects. The valve manufacturing process is very complex. If valves are cast with voids or inclusions, these defects may increase the likelihood of damage and lead to fluid leakage during use. The main function of valves is to control the flow of fluid. Valve throttling at high pressure, due to the influence of gas, valve throttling position is likely to produce cavitation, resulting in valve damage. Finally, when the valve controls the flow of fluid, the valve will also be subjected to high pressure and will be damaged. As the temperature changes, the amount of gas in the pipe changes. As the temperature rises, the amount of gas increases, increasing the pressure of the gas in the pipe. This can also cause some damage to the valve. If the temperature is too high, exceeding the heat resistance of the valve may cause the valve to break, and may cause the valve to wear faster and cause damage.

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