Use relays, contactor, button, air switch and travel switch etc low-voltage constitute control circuit called relay contact control circuit.
使用继电器、接触器、按钮、空气开关、行程开关等低压电器构成的控制电路称为继电接触控制电路。
When cold WFI is needed, the cooling mode (fig. 5) is turned on by an air switch, which closes the recirculation valve and opens the cooling water valve. Within seconds cold WFI is available.
当需要冷却注射水时，系统通过一个空气开关打开冷却模式（图5 ），同时关闭了循环水阀门打开了冷却水阀门，只需几秒钟，就可以得到冷却注射水了。
When cold WFI is needed, the cooling mode (fig. 5) is turned on by an air switch, which closes the recirculation valve and opens the cooling water valve. Within seconds cold WFI is available.
当需要冷却注射水时，系统通过一个空气开关打开冷却模式（图5 ），同时关闭了循环水阀门打开了冷却水阀门，只需几秒钟，就可以得到冷却注射水了。
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