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Transaction of the Japanese Society of Irrigation, Drainage and Reclamation Engineering No. 200, published on Apr. 25, 1999

Reprinted from Transaction of the Japanese Society of Irrigation, Drainage and Reclamation Engineering No. 200

Countermeasure of water hammer in pressure-reducing pipeline system using surge relief valve

	Hitone Inagaki		Research Student of the United Graduate School of Agricultural Sciences, Kagoshima University
	Kunio Ogura		Yokota Mfg. Co., Ltd.
	Noriaki Tsunoda		Crown Engineering Co., Ltd.
	Fumiyoshi Kondo		Faculty of Agriculture, Miyazaki University

Abstract (Original text)
We conducted a field test on a pressure-reducing pipeline system equipped with a new type of automatic control valves for field irrigation, and verified its pressure reducing function, reproducing the results of measurement by simulation using a mathematical model. The simulation of generating status of water hammering pressure brought about by the operation of a diversion device at the end of pipeline revealed that the rapid closeout of the terminal valve propagated pressure wave upstream through the automatic control valves. As a countermeasure for restraining the water hammering pressure, the installation of a surge relief valve was studied. As a result, it was found effective to install the surge relief valve at the end of the pipeline for the downstream side of a pressure-reducing valve (automatic control valve), and it was found effective to additionally install it at the upstream side of a pressure-reducing valve. It was also found that the size of the surge relief valve requires about the same level as the main pipe in terms of diameter.

Key words:

Automatic control valve, Pressure-reducing pipeline system, Surge relief valve, Mathematical model, Simulation

For details of this new type of automatic pressure control valve, please refer to Constant Pressure Valve UFSP type.