Series 774x double check valve assemblies are designed to prevent the reverse flow of polluted water from entering the potable water system 系列747双止回阀总成用于防止污水回流进入饮用水系统中。
2.
Series 774 double check valve assemblies are designed to prevent the reverse flow of polluted water from entering into the potable water system 系列747双止回阀总成用于防止污水回流进入饮用水系统中。
3.
Series 774xdcda double check detector assemblies are designed to prevent the reverse flow of polluted water from entering the potable water supply 系列747xdcda双止回阀检测器总成用于防止污水回流进入饮用水系统中。
