也谈热水供暖系统中的堵塞问题

Pipeline blocking in water heating systems

应用水压图分析了３个实例，说明在同程式系统中如有倒流现象，管道必有异物堵塞；有倒流必定有强流，堵塞部位在倒流与强流之间。若倒流在强流之后，则异物堵塞在供水管道，反之，则异物堵塞在回水管道。

Illustrates with a pressure diagram analysis of three examples that if backflow occurs in the reversed return system, always coincident with a strong flow, there must exist a solid blockage in the pipeline. A backflow occurring downstream of the strong flow indicates the solid blockage in the water supply pipe. Otherwise, the solid blockage must be in the return pipe.