HYDRAULIC BRIDGE FOR PRESSURE CONTROL IN A P-Q MULTIPLE LINE SEGMENT CONTROL VALVE

Authors

  • Richard Burton Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskachewan, Canada, S7N 5A9
  • Jian Ruan Department of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
  • Paul R. Ukrainetz Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskachewan, Canada, S7N 5A9

Keywords:

flow rate and pressure multiple control, pressure compensated flow valve, contour of valve port, linearity

Abstract

The conventional device for flow rate and pressure multiple control is a combination of a flow rate valve and a pressure relief valve. For the pressure control, a hydraulic bridge can also be used instead of using a pressure relief valve. In this paper, a special hydraulic bridge was developed to undertake pressure control in a pressure compensated flow rate valve and thus a new type of P-Q control valve is constructed. The pressure control in this P-Q control valve is a hydraulic bridge formed by the serial connection between a metering orifice and a drain orifice. The contour of the valve port has a significant effect on the linearity of the output pressure. Theoretical analysis shows that the linear pressure output characteristic corresponds to a valve port contour of a hyperbolic. Due to the difficult machining of this hyperbolic contour, a multiple line with two segment lines is used to approximate the valve port contour for linear pressure output. The pressure bridge is constructed in a 2D P-Q control valve and an experimental investigation is carried out. It is demonstrated that linearity of the output pressure is greatly improved by using the multiple segment line contour of the valve port and it is demonstrated that the output pressure is not sensitive to the variation of the temperature. With the introduction of the pressure control bridge, the P-Q valve is indeed greatly simplified.

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Author Biographies

Richard Burton, Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskachewan, Canada, S7N 5A9

Richard Burton P.Eng, Ph.D, Assistant Dean of the college of Engineering, Professor, Mechanical Engineering, University of Saskatchewan. Burton is involved in research pertaining to the application of intelligent theories to control and monitoring of hydraulics systems, component design, and system analysis. He is a member of the executive of ASME, FPST Division, a member of the hydraulics' advisory board of SAE and NCFP and a convenor for FPNI.

Jian Ruan, Department of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China

Jian Ruan Born on April 4th 1963 in Fuan City of Fujiang Province, P.R. China. Receving Ph.D. from Harbin Institute of Technology in Sept. 1989. Active in electrohydraulic (pneumatic) direct digital control components and systems. Postdoctoral fellow of FPTC, Zhejiang University. Professor of Mechanical Engineering at Zhejiang University of Technology

Paul R. Ukrainetz, Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskachewan, Canada, S7N 5A9

Paul Ukrainetz BE. 1957 University of Saskatchewan, M.Sc. 1960 Univ. of British Columbia, Ph.D. 1962 Purdue University Bristol Aeroplane Co. 1957, University of Saskatchewan Assistant Professor 1962, University of Saskatchewan Associate Professor 1966, University of Saskatchewan Full Professor 1971, Head Department of Mechanical Engineering, University of Saskatchewan 1974 – 1982, Professor Emeritus 1999 - date. Active in Fluid Power Systems since 1962.

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Published

2003-11-01

How to Cite

Burton, R., Ruan, J., & Ukrainetz, P. R. (2003). HYDRAULIC BRIDGE FOR PRESSURE CONTROL IN A P-Q MULTIPLE LINE SEGMENT CONTROL VALVE. International Journal of Fluid Power, 4(3), 5–15. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/598

Issue

2003: Vol 04 Iss 3

Section

Original Article