Abstract
Abstract At the principal control points of waterworks distribution systems, as well as in turbine penstocks, automatic valves are installed to shut off the flow of water in case of a pipe rupture. It is usual practice to assume the time and closure law of the valve and then to check the maximum surge caused by the valve closure. It is the purpose of this paper to determine the characteristics and the hydraulic design of self-acting shutoff valves in such a manner that the water hammer, even in the worst emergency condition, remains within permissible limits. To reduce the discharge of water after a break, the law of closure is chosen in such a manner that this discharge becomes a minimum. The necessary computations are made by the graphical method of pressure-rise determination as well as by simultaneous or conjugated equations. The author assumes that the reader is familiar with these methods.
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