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Transaction of the Japanese Society of Irrigation, Drainage and Reclamation Engineering No. 203, published on Oct. 25, 1999

Reprinted from Transaction of the Japanese Society of Irrigation, Drainage and Reclamation Engineering No. 203

Simulation of discharge check system of pipeline using variable constant flow valve

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

Abstract (Original text)
It is becoming more difficult to provide adequate distribution of water, because the water pipeline systems are covering increasingly wider areas. Therefore, a mechanism is needed that will control pipeline systems to maintain constant pressure and discharge. To solve this problem, a variable constant-flow valve has been developed that is capable of controlling and changing pipeline discharge. The performance of the valve has been tested to verify its function. The operating mechanism of the variable constant-flow valve is based on the equation of motion. A mathematical model of the valve was created, and the test results were simulated to check its basic functions.
Also, for assuming high-pressure closed pipelines, a simulation was conducted to check how the distribution of flow is affected when one junction in a pipeline is dominant and controls the flow through the entire pipeline system. In addition, the valve's performance was verified by placing it at an upstream junction and changing the pipeline pressure from up- and down-stream on the valve. This test confirmed that the valve maintained a constant, regardless of any pressure fluctuations, and that the discharge check system functioned properly.

Key words:

Variable constant flow valve, Pipeline, Discharge check system, Mathematical model, Simulation

For details of this variable constant flow valve, please refer to Constant Flow Regulator Valve UF series.