Building valves - copper alloy stopvalves for potable water supply in buildings - tests and requirements 建筑物阀门.建筑物内饮水供水用的铜合金断流阀.试验和要求
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Filters should be installed with by - pass and block valves to permit by - passing the filter during element changes if the stream cannot be shut down to allow element changes 假如在更换滤芯时不能关闭液流,就应该在过滤器上安装旁通阀和断流阀,以便在更换滤芯期间使液流从旁路绕过过滤器。