INFLUENCE OF NOTCH SHAPE AND NUMBER OF NOTCHES ON THE METERING CHARACTERISTICS OF HYDRAULIC SPOOL VALVES

Authors

  • Massimo Borghi Department of Mechanical and Civil Engineering – University of Modena & Reggio Emilia Via Vignolese, 905/b – 41100 Modena – Italy
  • Massimo Milani Department of Mechanical and Civil Engineering – University of Modena & Reggio Emilia Via Vignolese, 905/b – 41100 Modena – Italy
  • Roberto Paoluzzi IMAMOTER – CNR Via Canal Bianco 28 - 44044 Cassana (Ferrara) - Italy

Keywords:

Hydraulic components, spool valves, metering edge, metering notches, experimental characterization, discharge coefficient, axial flowforces

Abstract

The paper presents theoretical and experimental results of studies on the influence of shape and number of spool notches on the discharge characteristics (discharge coefficient, velocity coefficient and flow angle) of a hydraulic distributor metering edge.

The flow-rate vs. pressure drop and the steady state axial flow-force vs. pressure drop diagrams are determined for spools with different configurations of multiple notched metering edges. Various combinations of the shape and number of the notches modulating the metering area of the passage between supply and drain ports were investigated and correlated with flow-rate, axial flow-force and pressure drop, in order to get estimates of discharge coefficient and flow angle.

The procedure is applied to all the data collected during the experimental activity, and shows the behaviour of the flow characteristics in both the fully turbulent and transitional region of motion. The influence of notch shape and number on the metering edge flow characteristics is evaluated as well.

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Author Biographies

Massimo Borghi, Department of Mechanical and Civil Engineering – University of Modena & Reggio Emilia Via Vignolese, 905/b – 41100 Modena – Italy

MASSIMO BORGHI Born in Modena, 1956. Graduated cum Laude in Mechanical Engineering in 1981 at the University of Bologna. Researcher at the Faculty of Engineering in Bologna from 1983 to 1998. Associate Professor at the Faculty of Engineering in Modena from 1998 to 2001. Full Professor at the Faculty of Engineering in Modena since November 2001. Author of more than 60 scientific papers, concerning energy conversion systems, fluid power applications and components and internal combustion engines. Actually, his research activity is particularly involved in the prediction of the steady and transient characteristics of positive displacement pumps and motors (external gears units, vane units and axial piston ones), in the fluid dynamic optimization of on-off and proportional control valves metering characteristics, and in the optimization of the dynamic response of electro- hydraulic circuits for mobile applications.

Massimo Milani, Department of Mechanical and Civil Engineering – University of Modena & Reggio Emilia Via Vignolese, 905/b – 41100 Modena – Italy

MASSIMO MILANI Born in Modena in 1968. Graduated in Materials Engineering at the University of Modena in 1994. PhD in Materials Engineering at the University of Modena in 1998. Researcher at the Faculty of Engineering of the University of Modena from November 1999 to November 2002. Researcher at the Faculty of Engineering in Reggio Emilia from December 2002. Member of FPNI and SAE. Author and Co-Author of more than 40 papers dealing with the design of positive displacement pumps and motors, with the steady and transient characterization of on-off and proportional hydraulic components, with the development of gasoline and diesel injection systems and with the dynamic analysis and design of hydraulic equipment for automotive and off-road applications.

Roberto Paoluzzi, IMAMOTER – CNR Via Canal Bianco 28 - 44044 Cassana (Ferrara) - Italy

ROBERTO PAOLUZZI Born in Ferrara in 1961. Graduated in Nuclear Engineering at the University of Bologna in 1986. Senior Researcher at IMAMOTER - C.N.R. Institute with interests in fluid power systems, control and simulation and in computational fluid dynamics. Deputy General Secretary for Europe-Africa of ISTVS (International Society for Terrain- Vehicle Systems). Member of ASME and FPNI. Chairman of ISO/TC 127/SC 4 since 1991. Author of more than 160 papers and technical reports in fluid power systems technology and Earth Moving Machinery parts and components design.

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Published

2005-08-01

How to Cite

Borghi, M., Milani, M., & Paoluzzi, R. (2005). INFLUENCE OF NOTCH SHAPE AND NUMBER OF NOTCHES ON THE METERING CHARACTERISTICS OF HYDRAULIC SPOOL VALVES. International Journal of Fluid Power, 6(2), 5–18. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/568

Issue

2005: Vol 06 Iss 2

Section

Original Article