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A regulator of the air pump switch was developed in order to realize the automation of regulating pressure of the air pump switch.
为了实现气泵开关的自动调压，研制了气泵开关调压机。
Butterfly valve is also called a flap valve, is a simple structure of the regulating valve, but also can be used for low pressure pipeline medium switch control.
蝶阀又叫翻板阀，是一种结构简单的调节阀，同时也可用于低压管道介质的开关控制。
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