Performance study of a diaphragm type crankcase pressure control valve

Pressure control valve (PCV) is implemented in internal combustion engine to regulate crankcase pressure. In this study, the performance of a diaphragm PCV valve is investigated numerically and experimentally. Firstly, numerical simulation is carried out using commercial code to predict the flow and pressure distribution inside the valve. Furthermore, downstream and upstream pressure of the valve is measured in a laboratory test rig. Finally, displacement and oscillation of the diaphragm are measured by a high speed laser displacement sensor. Comparison of experimental and numerical results show that proposed method is capable to properly predict performance curve of the valve.