The spraying experimentations were carried in orchard by using constant pressure controller.

采用恒控制器在果园进行了喷洒实验。

Using constant pressure controlling, stability of liquids pressure in the pipeline could be guarantee and pipeline bursting could be prevented at the same time.

采用恒控制，可确保管道力的稳定性，同时防止管道爆裂。

Adopting constant pressure control devices can improve the stability of liquid pressure in pipeline, reduce the liquid pressure fluctuation which caused by the changing of spraying nozzles number.

采用恒控制装置能提升管道力的稳定性，减少因喷头数量变化引起的力波动。

Experimental result indicated that, using the constant pressure control device, the control error was 0.0167Mpa, the pressure control stability was 98.33%, the downtime to prevent pipeline bursting was 8.04s and the downtime after pipeline burst accidently was 8.88s.

实验结果表明，采用恒控制装置时，控制误差为0.0167Mpa，力控制稳定性达到98.33%，预防管道爆裂的停机时间为8.04秒，管道意外爆裂后的停机时间为8.88秒。