Analysis and investigation of the characteristics of the flow and the force on the poppet including the edge of the flow deviation in the hydraulic check valve

The movement of the poppet in the structure of check valves is accompanied by vibration under the influence of oil pressure. In this article, to reduce vibration and wear in check valves, a poppet including the edge of the flow deviation is used. Therefore, to evaluate the performance of these check valves, the effect of oil pressure, displacement, and length of deflection edge, on some dependent quantities, was investigated numerically and experimentally. Various evaluations showed that in all working conditions, the results of measurement of physical quantities have a difference of less than 5% from the results of numerical analysis. Further investigations showed that the creation of 2, 4, and 6 mm flow deflection edges in the end part of the poppet used in the internal structure of the hydraulic check valve, increases the axial force by 2.3, 18.1, and 22.9 percent, respectively. While the creation of the edge of the flow deviation poppet reduces the discharge coefficient of the valve by 1.57%. Also, creating a curve of 4 mm in the inlet port of the valve increases the axial force on the moving poppet by 14.2%. In addition, the increase in displacement of the poppet, while increasing the force on it, increased the force coefficient and the discharge coefficient of the valve. Also, in different valve displacements, the discharge coefficient of a check valve including a valve without a flow deviation edge is higher than the discharge coefficient of a valve including a valve with a flow deviation edge.