To prevent water damage , the valve must be properly connected to a discharge line which terminates at an adequate drain 为了防止水的破坏,这些阀门必须与排水管道连接,以便能够将水排到适当的排水口。
Elastomeric seals - materials requirements for pipe joint seals used in water and drainage applications - part 1 : vulcanized rubber ; german version en 681 - 1 : 1996 a1 : 1998 a2 : 2002 ac : 2002 弹性密封件.给排水管道连接密封件材料要求.第1部分