In order to study the relationship between the pressure regulating properties and the structural parameters of pressure regulator used in irrigation system, tests on the pressure regulating properties of seven low flow types of pressure regulators integrated with springs were conducted. The relationship between the spring parameters and the preset outlet pressure, and the forces acting on the builtin moving parts were also analyzed. The results showed that pressure regulator with lower preset outlet pressure has higher performance of regulating. The difference between measured critical working pressure and preset outlet pressure increases with the preset outlet pressure and is not equal to a constant of 0.034 MPa. As the preset outlet pressure increases, the spring stiffness constant increases with a larger spring diameter and a shorter spring natural length. Both the initial and maximum spring forces are in positive linear relationship with the preset outlet pressure. As well, when the regulating part moves toward the inlet of the pressure regulator, the ratio of spring force to hydrostatic pressure exerting on the outlet crosssection of the regulating part increases with an average from 57.9% to 66.5%, and the sum of friction force of the sealing part and the deformation force of rubber diaphragm decreases with an average from 39.9% to 31.3%.
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Nelson Irrigation Corporation.Pressure regulator literature[EB/OL].[2010-03-01].http://www.nelsonirrigation.com/products/index.cfm?id=11＆speci-ficquery=1.