self-closing valve

例句：

1. 1. The self-closing valve prevents the leakage of gas during operation.
   自闭阀在操作过程中防止气体泄漏。
2. 2. The self-closing valve is designed to automatically close when the pressure drops below a certain level.
   自闭阀设计为当压力降至一定水平以下时自动关闭。
3. 3. The self-closing valve is widely used in industrial applications due to its reliability and ease of maintenance.
   自闭阀因其可靠性和易于维护而广泛应用于工业应用中。