Flow-force analysis in a hydraulic sliding-spool valve
Herakovič, Niko (Author)

URLURL - Presentation file, Visit http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=77620 This link opens in a new window

The necessary forces for the control of a hydraulic sliding-spool valve are normally determined by the stationary axial momentum forces of the oil flow through a valve. These forces increase with an increase in the volume flow and the pressure difference. Because of the limited actuating-force potential of normal electromechanical actuators, the direct actuation of conventional valves is limited to small dimensions of valves. To make possible the use of directly actuated valves also for higher hydraulic power and to utilize the direct valve actuation also for higher flows and pressures, the flow forces acting on the valve piston in the axial direction must be compensated. This is possible with an appropriate flow stream of fluid through the valve through which the axial component of the flow forces in a conventional valve is reduced. This research work presents an analysis and compensation of the flow forces through an appropriate construction of a hydraulic piston valve of nominal size 6.

Keywords:hidravlika, fluidna tehnika, hidravlični ventili, tok fluida, pretočne sile, fluid rate, flow forces, hydraulic sliding spool valve, flow force analysis, flow force compensation, outlet edge, inlet edge
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Number of pages:str. 555-564
Numbering:Vol. 51, no. 6
ISSN on article:0562-1887
COBISS.SI-ID:11989787 Link is opened in a new window
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Record is a part of a journal

Shortened title:Strojarstvo
Publisher:Savez društava strojarskih i brodograđevnih inženjera i tehničara Hrvatske
COBISS.SI-ID:121879 This link opens in a new window

Secondary language

Potrebne sile za upravljanje hidrauličkim ventilom ovise u velikoj mjeri od stacionarnih aksijalnih impulznih sila strujanja ulja kroz ventil. Ove sile povećavaju se s porastom strujnog toka ulja i razlike tlakova. Zbog ograničenih sila za upravljanje ventilom, koje omogućuju uobičajeni elektromehanički pretvornici, kod konvencionalnih ventila direktno je upravljanje ograničeno na male dimenzije ventila. Da bi omogućili upotrebu direktno upravljanih ventila i za velike strujne tokove i tlakove, potrebno je smanjiti strujne sile koje djeluju na klip ventila. To se može postići primjernim vođenjem strujanja fluida kroz konvencionalni ventil tako da dođe do smanjenja odnosno kompenziranja aksijalnih komponenata visokih sila strujnog toka u ventilu. U okviru ovog istraivačkog rada analizirane su, i s odgovarajućom konstrukcijom minimizirane, strujne sile u jednom hidrauličkom ventilu s uzdužnim klipom dimenzije NG 6.

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