产品描述用途：700X具有300×缓闭式逆止阀功能。于抽水机停止运转前，可***关闭主阀至约90%，再停止抽水机运转，其余10%再行关闭，可完全防止水锤和水击现象产生。公称通径DN（mm）尺寸（mm）LDD1F1H1H25205115851302503303221013510013526034040210145110150280380502401651251552853956527518514516530041080290200160175310430100370220180195340500125400250210220380540150455285240230410580200550340295260440660250745405355300460720300800460410340480755350830520470420515820400860580525440550880450860640585460580910500950705650490630950)