Before installation, check line of flow through valve so that valve will function properly.
Before installation, check line of flow through valve so that valve will function properly.
安装前，切断通过阀门的流体，以使阀门工作正常。
Before installation, check line of flow through valve so that valve will function properly.
安装前，切断通过阀门的流体，以使阀门工作正常。