Clean pumps. Check valves for silt and sand.
清洁泵体，检查阀门是否附着有泥沙。
In larger systems, such as those employing long transfer lines or piping, check the flow charts and piping diagrams for the identification of valves and written cleaning procedures.
在一些更大的系统中，例如那些使用很长的传送带或管道系统，应该对流程图和鉴定阀门的管道系统图和书面的清洗程序进行检查。
Take apart all valves along the pipeline for washing before installation, check whether valve handles are flexible. The valves can be installed after passing the pressure test.
管路上的各种阀门在安装前要拆开清洗，检查阀柄是否灵活，并经试压不漏后方可安装。
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