求翻译：安装减压器时，应首先检查氧气瓶阀门，接头不得有油脂，并略开阀门清除油垢，然后安装减压器。作业人员不得正对氧气瓶阀门出气口。关闭氧气阀门时，必须先松开减压器的活门螺丝。是什么意思？

Install pressure reducer should first check the oxygen bottle valve, may not have grease fittings, grease removal and slightly open the valve, then install the pressure reducer. Operators are not on the oxygen bottle valve outlet. Close the oxygen valve, the valve pressure reducer must first loosen

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When the regulator is installed, you should first check the oxygen cylinder valve, and there shall be no oil, slightly open valve and clear oily dirt, and then install pressure reducer. Workers not being on oxygen cylinder valve to vent. When the oxygen valve is closed, you must first release the un

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