That is the background of balance valve and automatic valves been produced.
水力平衡 装置正是在这种背景下产生的。
Valves may also be automatic, driven by changes in pressure, temperature, or flow.
阀门也可能是自动的，在推动的变化由压力，温度或流量。
Valves may also be automatic, driven by changes in pressure, temperature, or flow.
阀门也可能是自动的，在推动的变化由压力，温度或流量。
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