needle valve spring

例句：

1. 1. The new pump has a needle valve spring that can be adjusted to control the flow of water.
   新泵有一个可调节的针阀弹簧，可以控制水流。
2. 2.The needle valve spring is responsible for maintaining the proper pressure in the system.
   针阀弹簧负责维持系统内适当的压力。
3. 3.The engineer replaced the old needle valve spring with a new one to improve efficiency.
   工程师用一个新的针阀弹簧替换了旧的，以提高效率。