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Technical Briefs

Pressure Transient Flow Forces for Hydraulic Spool Valves

[+] Author and Article Information
Noah D. Manring1

Mechanical and Aerospace Engineering,  University of Missouri, Columbia, MO 65211

Shusen Zhang

Mechanical and Aerospace Engineering,  University of Missouri, Columbia, MO 65211

1

Corresponding author.

J. Dyn. Sys., Meas., Control 134(3), 034501 (Mar 27, 2012) (5 pages) doi:10.1115/1.4005506 History: Received April 26, 2011; Revised October 27, 2011; Published March 27, 2012; Online March 27, 2012

The objective of this paper is to experimentally investigate the significance of the pressure transient flow force acting on hydraulic spool valves. In the past, this flow force effect has been routinely neglected due to its assumed small size. Through analytical and experimental methods, this research shows that flow forces due to pressure transient effects can be comparable in magnitude to the steady flow forces acting on the valve and that the past tradition of neglecting this effect may not always be justified. The paper also shows that the traditional steady flow force model does a fairly good job predicting the steady flow forces on the valve, but more research must be done to develop a good model for pressure transient flow forces.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A schematic of the two-way spool valve and the control volume used to derive an expression for the flow forces acting on the spool valve

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Figure 2

A schematic of the experimental setup used to measure the flow forces acting on the two-way spool valve

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Figure 3

A photograph of the experimental setup used to measure the flow forces acting on the two-way spool valve

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Figure 4

Square pressure-wave generation

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Figure 5

Flow force results where the green line in the top strip chart is the theoretical result produced using Eq. 4

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