Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/41998
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Type: Journal article
Title: In-line check valves for water hammer control
Author: Karney, B.
Simpson, A.
Citation: Journal of Hydraulic Research, 2007; 45(4):547-554
Publisher: Int Assn Hydraulic Research
Issue Date: 2007
ISSN: 0022-1686
1814-2079
Statement of
Responsibility: 
Bryan W. Karney and Angus R. Simpson
Abstract: This study systematically explores the relatively neglected surge protection strategy of installing an in-line check valve at an intermediate point within a pipeline. The in-line check valve is selected to isolate part of the system from a high-pressure source of fluid subsequent to a low-pressure water hammer event, in this way greatly reducing or eliminating any return surge. A typical application involving a pipeline with an isolated high point within its profile is numerically investigated. The low pressure transient event first opens an air-vacuum valve at the line’s high point. However, the violent expulsion and collapse of this air cavity is thereafter avoided, and thus the resulting water hammer pressures dramatically reduced, by an in-line check valve installed between the high point and the downstream reservoir. The effectiveness of the surge protection is shown to depend on hydraulics and topology of the line (particularly the position of the high point), on the position of the check valve, and on both the hydraulic and mechanical properties of the check valve. Although the check valve only protects the lower (normally upstream) portion of the line from the return surge, the transient response of the remainder of the line can sometimes be improved through installing either a bypass around the check valve or by perforating the check valve’s working element. The role and function of any pressure-relieving function at the valve is also numerically investigated and is shown to be a compromise between upstream and downstream protection.
Rights: ©2007 International Association of Hydraulic Engineering and Research
RMID: 0020072338
DOI: 10.1080/00221686.2007.9521790
Appears in Collections:Civil and Environmental Engineering publications
Environment Institute publications

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