Experiment on mechanical properties of Venturi constant air volume valves

Designs an experimental table for mechanical properties of Venturi constant air volume valves. Based on the experimental data, analyses the relationship among the flow resistance around a spool, the spool position and the flow rate. Elaborates the variation trends of flow resistance around a spool. Obtains the theoretical expression of spring performance curve for the valve with shrinkage angle of 15° in the air flow rate range of 300-1 500 m3/h and 500-1 000 m3/h, respectively.