如果需要计量，产品直接或通过进料装置（旋转阀或螺旋喂料器）进入管道，悬浮在气流中，并根据粒径和密度以相对较高的速度输送。输送的产品通过旋转气闸连续地或通过阀门间歇地从接收容器中排出。疏相或稀相真空输送系统通常使用容积式抽风机来提供真空（高达 50%），将物料通过管道输送到接收容器，然后在接收容器中过滤和分离空气和产品。还可以使用较低产能的基于风扇的系统。
应用
疏相真空系统特别适用于将低到中等产能的物料，从多个点到单个目的地的中等距离输送。它们用途广泛且适应性强，并且工作压力低，允许使用更便宜的管道和配件。这种方法经常用于中央真空清洗系统，或从多个筒仓和其他需要真空管网状网络将产品输送到单个收集点的应用中抽取产品。技术规格
| 输送率： | < 10 吨/小时。 |
| 输送距离： | 长达 100 米 |
| 空气动力： | 容积式（罗茨型）抽风机或风扇 |
| 工作压力： | <50% 真空 |
| 空气比： | 低到中等 |
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