Title: +038=320.103-SB005T_08-Energy Valve Reguleringsventil Belimo - Generelle merknader for prosjektering.pdf
To ensure a valve achieves adequate control characteristics and thus a long service life for the HVAC performance device, it must be correctly designed with the correct valve authority Pv. The valve authority is the benchmark for the control characteristics of the valve in combination with the hydronic network. The valve authority is the relation at nominal load between the differential pressure of the fully open valve (∆pv100) at nominal flow and the maximum differential pressure for the closed valve. The higher the valve authority, the bet- ter the control characteristics. The smaller the valve authority, the more the operational behaviour of the valve will deviate from the characteristic curve, i.e. the poorer the volumetric flow control will be. A valve authority of more than 0.5 is desired in everyday practice. Dimensioning of a valve is explained below in six steps.3-way control valves