The bottom of the risers is provided with a cleaning drainoutlet which can be opened for washing the risers one by one by adding a cleaning agent after a period of use.
在上行管的底部设一清洗排污出口，用过一段时间加入清洗剂，打开 下排污口进行冲洗，一根根清洗。
2
This positions the relief valve below the first check valve, enabling the zone to drain through the relief valve outlet.
在这种位置，安全阀位于第一止回阀下面，使得这个区能够通过安全阀出口排放。
3
A proper drain line connected to the valve outlet and run to a safe place of disposal must be installed.