Character of Steady Distribution at Orifice Type Division Works using Disk Valve

• Published in: Transactions of The Japanese Society of Irrigation, Drainage and Reclamation Engineering Vol. 1997; no. 187; pp. 123 - 131,a3
• Main Authors: INAGAKI, Hitone, KUNITAKE, Masato
• Format: Journal Article
• Language: English; Japanese
• Published: The Japanese Society of Irrigation, Drainage and Rural Engineering 1997
• Subjects: Constant flow offtake regulator; Disk valve; Diversion accuracy; Float valve; Orifice; Overflow gate
• ISSN: 0387-2335; 1884-7234
• DOI: 10.11408/jsidre1965.1997.123

In a medium and small-scale pipeline system, float valves like a disk valve actuated automatically by water pressure tend to be installed at a diversion works or a relay tank, for accomplish demand-oriented water control. However, a means for adding a flow control mechanism to a float type diversion works is the subject to be solved since a float valve effects only decompression. As a constant flow offtake regulator for a float valve type diversion works using a disk valve, the hydraulic diversion functions of three kinds of regulators like an overflow gate, an orifice gate and an overflow/orifice gate were examined, and the diversion accuracy was theoretically verified. Further, after the diversion function was confirmed comparing with experimental values, the mathematical model had been built based on a concrete constant flow diversion works, and the diversion accuracy was analyzed by carrying out the simulation under various conditions. As the result, it has become clear that, also at the float valve type diversion works having only a pressure reduce function, practically enough diversion accuracy can be obtained without affection from the change of the flow condition at the upstream of the pipeline, by combining an orifice gate with the diversion works for adjusting the amount of the flow.