Research and simulation on valve plate of water hydraulic axial piston pump (motor)

This paper introduces the developments of valve plate of hydraulic pump or motor. According to the physicochemical properties of water, a whole moment balanced valve plate of water hydraulic piston pump or motor is analyzed. Through numerical simulations the effect of structure of valve plate on cylinder pressure has been researched. The simulation results indicate that the silencing grooves inside the close angles of the valve plate have significant influences on cavitation. The absence of silencing grooves on the valve plate will result in the high vacuum at the top dead center (TDC) and the pressure overshoot at the bottom dead center (BDC). In order to get good performance of pump and motor, we deem it wise that the invalid volume V 0 be as small as possible. In addition, too small backpressure will make the cylinder pressure decrease below the vapor pressure of water. It is recommended that the backpressure Pd should be larger than 0.2 MPa.