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Open AccessArticle

Experimental Investigation on Contaminated Friction of Hydraulic Spool Valve

by Shuai Fan 1,2, Rui Xu 1,2, Hong Ji 1,2,*, Shengqing Yang 1,2 and Qingyun Yuan 1,2
1
Energy and Power Engineering College, Lanzhou University of Technology, Lanzhou 730050, China
2
Gansu Province Research Center of Hydraulics and Pneumatics Engineering Technology, Lanzhou 730050, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(23), 5230; https://doi.org/10.3390/app9235230
Received: 11 November 2019 / Revised: 24 November 2019 / Accepted: 26 November 2019 / Published: 1 December 2019
(This article belongs to the Section Mechanical Engineering)
This paper focuses on the contaminated friction of fit clearance between the spool and valve body to explore the influence principles of clamping stagnation phenomenon. From the perspective of surface morphology and size of particulates in the clearance, designing and manufacturing the valve body, rough spool, conical spool, and standard morphology spool, the test bench was built up and the curves of real-time contaminated friction in the movement of spools were obtained through experiments. The curves show that the contaminated frictions have a feature of pulsation; meanwhile, the stagnation-sensitive size of particulates is between 0.7 and 0.9 times that of clearance. Compared to the ideal morphology spool within the range of sensitive size, the contaminated fiction of rough spool is increased, whereas the lower limit of stagnation-sensitive size range of particulates on conical spool is decreased. The contaminated friction is gradually increased on cis-conical spool but increased first and then decreased on invert cone spool. View Full-Text
Keywords: hydraulic spool; solid particulates; contaminated friction; stagnation-sensitive size hydraulic spool; solid particulates; contaminated friction; stagnation-sensitive size
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MDPI and ACS Style

Fan, S.; Xu, R.; Ji, H.; Yang, S.; Yuan, Q. Experimental Investigation on Contaminated Friction of Hydraulic Spool Valve. Appl. Sci. 2019, 9, 5230.

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