Oil Stiction in Fast Switching Annular Seat Valves for Digital Displacement Fluid Power Machines

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Abstract

Digital Displacement (DD) fluid power machines utilizes electronically controlled seat valves connected to pressure chambers to obtain variable displacement with high operational efficiency and high bandwidth. To achieve high efficiency, fast valve switching is essential and all aspects related to the dynamic behaviour of the seat valves must be considered to optimize the machine efficiency. A significant effect influencing the valves switching performance is the presence of oil stiction when separating the contact surfaces in valve opening movement. This oil stiction force is limited by cavitation for low pressure levels, e.g. valves connected to the low pressure manifold, however for valves operated at higher pressure levels, the oil stiction force is dominating when the separating surfaces are close to contact.
This paper presents an analytic solution to the oil stiction force for annular seat valves suitable for DD applications based on the Reynolds equation and considers contact surface curvature and attack angle. A dynamic cavitation zone is included in the stiction model, and cavitation is found to be present even for seat valves surrounded by high pressure levels.
OriginalsprogEngelsk
TitelProceedings of the 12th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2014
Antal sider9
ForlagAmerican Society of Mechanical Engineers
Publikationsdatojun. 2014
DOI
StatusUdgivet - jun. 2014
BegivenhedASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis - Tivoli Hotel, Copenhagen, Danmark
Varighed: 25 jun. 201427 jun. 2014
http://www.asmeconferences.org/ESDA2014/

Konference

KonferenceASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis
LokationTivoli Hotel
Land/OmrådeDanmark
ByCopenhagen
Periode25/06/201427/06/2014
Internetadresse

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