Self-Operating Differential Pressure Control Valve Testing Research Based on the Multi-Functional Fluid Apparatus

Self-operating differential pressure control valves have been widely used in HVAC system because of its unique control functions. For the research and development of the valves, a large number of performance parameters such as flow-resistance and controlled differential pressure are required. This paper proposed a multi-functional fluid apparatus on the basis of virtual instrument technology and frequency conversion technology which can achieve continuous sampling of the test point. The measurement method and valve characteristics analysis are also practised.