The vertical axis represents products already installed, while the horizontal axis represents products that you are attempting to install.
纵轴表示已安装的产品，横轴表示准备安装的产品。
NIBCO Iron Body Check Valves may be installed in both horizontal and vertical lines with upward flow or in any intermediate position.
尼伯科铸铁阀体止回阀可以安装在水平管线或流向朝上的垂直管线中的任何位置上。
It may be installed in either vertical or horizontal position.
既可以安装在垂直位置，也可以安装在水平位置。
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