Valve leakage is a common issue in industrial piping systems. It may reduce system efficiency, create safety risks, and increase maintenance cost. One common cause is incorrect valve selection. If the valve material, pressure rating, or seal type does not match the fluid and operating condition, leakage may occur earlier than expected. Seal wear is another frequent reason. Over time, valve seats, seals, and packing materials may wear due to repeated operation, pressure changes, or fluid characteristics. Improper installation can also cause leakage. To prevent leakage, customers should choose the right valve type, confirm working conditions, install correctly, and plan regular maintenance.