止回阀用途广泛,有很多种类,下面说的是供水和热力常用的止回阀:
1、弹簧式:液体由下而上,依靠压力顶起弹簧控制的阀瓣,压力消失后,弹簧力将阀瓣压下,封闭液体倒流。常用于通径较小的止回阀。
2、重力式:和弹簧式相似,依靠阀瓣的自身重力封闭,防止倒流。
3、旋启式:液体在阀体内直通,依靠压力顶开一侧的旋转阀瓣,压力失去后,阀瓣依靠自重回位,反向的液体压力封闭阀瓣。
4.塑料隔膜式: 外壳和隔膜均为塑料.一般外壳为ABS,PE,PP,NYLON, PC.隔膜有硅树脂,氟树脂等。
其它的单向阀(止回阀),如排污的止回阀,人防的防爆阀和液体使用的止回阀的原理是大同小异。
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北京华德先导式溢流阀部分型号:
DB3U10H-1-30B/100G24NZ5L DB3U20H-3-30B/100XW220-50NZ5L
DB3U10H-1-30B/100W220-50NZ4 DB3U20H-3-30B/100XYG24NZ4
DB3U10H-1-30B/100W220-50NZ5 DB3U20H-3-30B/100XYG24NZ5
DB3U10H-1-30B/100W220-50NZ5L DB3U20H-3-30B/100XYG24NZ5L
DB3U10H-1-30B/100XG24NZ4 DB3U20H-3-30B/100XYW220-50NZ4
DB3U10H-1-30B/100XG24NZ5 DB3U20H-3-30B/100XYW220-50NZ5
DB3U10H-1-30B/100XG24NZ5L DB3U20H-3-30B/100XYW220-50NZ5L
DB3U10H-1-30B/100XW220-50NZ4 DB3U20H-3-30B/100YG24NZ4
DB3U10H-1-30B/100XW220-50NZ5 DB3U20H-3-30B/100YG24NZ5
DB3U10H-1-30B/100XW220-50NZ5L DB3U20H-3-30B/100YG24NZ5L
DB3U10H-1-30B/100XYG24NZ4 DB3U20H-3-30B/100YW220-50NZ4
DB3U10H-1-30B/100XYG24NZ5 DB3U20H-3-30B/100YW220-50NZ5
DB3U10H-1-30B/100XYG24NZ5L DB3U20H-3-30B/100YW220-50NZ5L
DB3U10H-1-30B/100XYW220-50NZ4 DB3U20H-3-30B/315G24NZ4
DB3U10H-1-30B/100XYW220-50NZ5 DB3U20H-3-30B/315G24NZ5
DB3U10H-1-30B/100XYW220-50NZ5L DB3U20H-3-30B/315G24NZ5L
DB3U10H-1-30B/100YG24NZ4 DB3U20H-3-30B/315W220-50NZ4
DB3U10H-1-30B/100YG24NZ5 DB3U20H-3-30B/315W220-50NZ5
DB3U10H-1-30B/100YG24NZ5L DB3U20H-3-30B/315W220-50NZ5L
DB3U10H-1-30B/100YW220-50NZ4 DB3U20H-3-30B/315XG24NZ4
DB3U10H-1-30B/100YW220-50NZ5 DB3U20H-3-30B/315XG24NZ5
DB3U10H-1-30B/100YW220-50NZ5L DB3U20H-3-30B/315XG24NZ5L
DB3U10H-1-30B/315G24NZ4 DB3U20H-3-30B/315XW220-50NZ4
DB3U10H-1-30B/315G24NZ5 DB3U20H-3-30B/315XW220-50NZ5
DB3U10H-1-30B/315G24NZ5L DB3U20H-3-30B/315XW220-50NZ5L
DB3U10H-1-30B/315W220-50NZ4 DB3U20H-3-30B/315XYG24NZ4
DB3U10H-1-30B/315W220-50NZ5 DB3U20H-3-30B/315XYG24NZ5
DB3U10H-1-30B/315W220-50NZ5L DB3U20H-3-30B/315XYG24NZ5L
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