drop-in check valve

例句：

1. 1. The drop-in check valve is used in the oil pipeline to prevent oil from flowing backwards.
   在石油管道中使用的插管式止回阀，防止油反向流动。
2. 2.The drop-in check valve is a critical component of the safety system in the chemical plant.
   在化工厂的安全系统中，插管式止回阀是一个关键部件。
3. 3. The drop-in check valve is designed to ensure that only fluids with low pressure can enter the system.
   插管式止回阀的设计是为了确保只有具有低压力的流体才能进入系统。