由于车辆停止工作后尿素泵和管路路中任残留有液体存在，欧曼尿素泵换向阀，所以车辆关闭点火开关后都需执行清空工作****结晶或*。目前多半尿素泵在清空环节设计或多或少都有缺陷。拿博世6.5系统来说，采用膜片电机以9赫兹的频率工作来进行抽空，廊坊欧曼尿素泵，当电机铁芯底部橡胶圈损坏后就会出现吸住不能往复运动，欧曼尿素泵计量阀，此外还经常出现单向膜片密封不严导致电机没有吸力等等，这些都会引起清空不*而造成结晶堵塞。

博世2.2尿素泵电机

博世2.2尿素喷嘴 202V27120-0008，欧曼尿素泵尿素箱，612640130089潍柴博世号 尿素喷嘴

派格丽尿素泵计量阀 尿素喷嘴 广西三立尿素泵计量阀 尿素喷嘴

博世6.5尿素泵 回抽电机 电磁回抽泵

博世2.0尿素喷嘴J0100-1205580，0445023019.

拿天纳克系统来说，天纳克的尿素泵液路是一个环形，尿素泵在启动后即刻开始运转让尿素液来散热喷嘴，所以当您屏蔽了尿素系统工作就会让喷嘴处于孤立无援的境地，只能在高温环境下坐以待毙。长时间不运转的尿素泵和管路因残留在内部的液体水分蒸发就会结晶堵死

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