Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
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An Analysis of the Dynamic Characteristics of a Spool Type Pressure Control Valve

스풀형 압력제어밸브의 동특성 해석

  • Moon, Kang Hyun (Graduate School, Korea University of Technology and Education) ;
  • Huh, Jun Young (School of Mechatronic Engineering, Korea University of Technology and Education)
  • Received : 2018.11.01
  • Accepted : 2018.11.14
  • Published : 2018.12.01
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Abstract

Almost every hydraulic system is equipped with a pressure relief valve, to maintain working pressure of the system at a pre-determined level. Thus, dynamic characteristics of such a relief valve, in conjunction with other hydraulic components, are important in designing the hydraulic control system. The single stage pressure relief valve is dynamically undesirable, due to relatively low viscous damping, that causes high frequency oscillations. This problem is overcome by introducing orifices in the inner pilot line, and drain line. In this study, for the single stage spool type pressure relief valve, the system equations were derived through an adequate linearisation and several simplifications were made, to use the transfer function formulation technique. All coefficients were evaluated and used, to make some results by using Matlab software. Results of analysis are compared with experimental results. In this study, parameters affecting stability of valve design are determined and suggested relative to the design.

Keywords

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Fig. 3 Block diagram of a pressure control valve

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Fig. 1 Schematic diagram of a spool type pressure control valve

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Fig. 2 Model diagram

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Fig. 4 Bode diagram of open loop transfer function

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Fig. 5 Bode diagram of open loop transfer function

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Fig. 6 Hydraulic circuit of counter balance valve with load simulator

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Fig. 7 Hydraulic components arrangement

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Fig. 8 Comparision of the step responses

Table 1 Parameters used in system modeling

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References

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