wash-out valve

例句：

1. 1. The engineers were working on the new washing-out valve design.
   工程师们正在研究新的倒流阀设计。
2. 2.The old valve was a wash-out valve, which made it difficult to operate.
   旧阀门是一个倒流阀，这使得操作变得困难。
3. 3. The engineers replaced the old wash-out valve with a new one that could better control the flow of water.
   工程师们用一个新的可以更好地控制水流的倒流阀替换了旧的。