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                              Simulation of hydraulic transients of pilot pressure relief valve



                                                       YANG Kailin
                                  (State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,
                                 China Institute of Water Resources and Hydropower Research,Beijing  100038,China)


                   Abstract: The pilot operated pressure relief valve is an advanced intelligent hydraulic device against water
                   hammer hazards,which can automatically open or close according to the change of water pressure in water
                   diversion pipeline. This paper establishes the functional relationship between the hydraulic transient flow,
                   water pressure and the opening of the pressure relief valve,puts forward the progressive model of the open⁃
                   ing of the main valve of the pressure relief valve in response to the change of water pressure, and then
                   puts forward the method and program of computer numerical simulation of the action process of the pilot
                   pressure relief valve in response to the change of water pressure. Finally, through a practical engineering
                   example, the ability of the pipeline to bear negative pressure and the influence of the diameter and linear
                   opening and closing time of the pilot pressure relief valve on the hydraulic transients are studied. The re⁃
                                                      t
                   sults show that the pressure relief valve can’ always be fully opened in the process of water hammer,but
                   only partially opened, or even only a small opening, thus affecting the reduction effect of the subsequent
                   sudden increase of the impact water pressure,which should be paid attention to the analysis of water ham⁃
                   mer hazard protection in the future.
                   Keywords:pilot operated;pressure relief valve;hydraulic transient;simulation;water hammer protection

                                                                                   (责任编辑:韩         昆)

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