The auto reversing universal changeover switch substitute for the button, and one hole substitute for multi-hole.
自动复位万能转换开关取代按钮，一孔取代多孔。
In the lack of condition for the pressure test, it is not allowed to remove the lead sealing of the reversing valve to adjust the pressure regulating button.
在不具备压力试验条件时，不允许拆掉换向阀的铅封和调整调压弹簧座。
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