Note: Check marks on valve before installation to see if the certificate of acceptance conforms with the requirements of application . Clean up dirt from the valve after it been checked .

注：安装前必须核对阀门上标志、合格证是否符合使用要求，核实后清除污物。

youdao

Note: Check marks on valve before installation to see if the certificate of acceptance conforms with the requirements of application . Clean up dirt from the valve after it been checked .

注：安装前必须核对阀门上标志、合格证是否符合使用要求，核实后清除污物。

youdao