Author(s)

0. Giustolisi, M. Mastrorilli & F. Porcaro

Abstract

A water hammer protection device in lifting systems, especially in low pressure ones, has been experimentally studied by Giustolisi et al/'^. Water hammer, in the experimental tests of the analyzed device, is caused by a fast interception of the water flow by means of a spherical valve located just downstream of the hy- draulic system pump. Such a device comprises a generic check valve and a con- centrated head loss located at one end of a bypass; the latter must be installed between the upstream reservoir and the delivery pipe of the hydraulic system, downstream of the section in which the water flow cut-off has been generated, with the valve close to the reservoir. The valve allows water to flow from the res

Keywords