low-speed needle valve

例句：

1. 1.The low-speed needle valve is used in the oil pump to prevent backflow.
   低速针型阀门用于油泵中以防止回流。
2. 2. The engineer carefully adjusted the low-speed needle valve to ensure smooth operation.
   工程师仔细调整了低速针型阀门，以确保操作顺畅。
3. 3. During maintenance, the technician replaced the old low-speed needle valve with a new one.
   在维护期间，技术人员用一个新的低速针型阀门替换了旧的。