valve scaler

例句：

1. 1. The valve scaler was used toadjust the flow rate of the oil.
   阀门调节器用于调整油的流量。
2. 2. The valve scaler was responsible for monitoring and controlling thetemperature in the furnace.
   阀门调节器负责监控和控制炉内的温度。
3. 3. The valve scaler was designed to prevent overheatingand ensure safe operation of the machinery.
   阀门调节器设计用来防止过热并确保机械的安全运行。