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2019, vol. 44, iss. 4, pp. 1-16
Hydraulic symbols - part four: Directional control valves
aUniversity of Belgrade, Faculty of Agriculture, Department of Agricultural Engineering
bUniversity of Belgrade, Faculty of Mechanical Engineering

emailepetrodr@agrif.bg.ac.rs
Project:
The Improvement and Preservation of Biotechnology Procedures for Rational Energy Use and Improvement of Agricultural Production Quality (MESTD - 31051)

Abstract
The mechanization of a wide variety of production processes and operations in modern primary agricultural production, transport, storage and the accompanying food processing industry can hardly be accomplished without automation. In most cases, production efficiency and environmental sustainability require, among other things, accurate control of the flow of energy within the installations, work machines, devices and mechanisms used. From the point of view of the theory of automatic control and regulation, the elements of the engaged technique: machines, devices and mechanisms represent the objects of control. The controlled routing and optimal delivery of energy to desired management facilities is, as a rule, very rarely uniform, as it must have correctlyaligned timing with the current variable requirements of the production or operation process, which often change quite unpredictably over the time. The required amount of energy can be transferred to consumers in agriculture through the application of appropriate mechanical, electrical, pneumatic or hydraulic systems, as well as with their combinations. All existing kinds of energy transmission systems have certain advantages and disadvantages, with a common requirement for appropriate controls. In the focus of interest of this paper are the graphic symbols of the directional control valves for hydraulic transmission and control, designated as hydraulic directional control valves, or shorter, the hydraulic distributors.
References
*** (2017) ISO 1219-1:2012(en): Fluid power systems and components: Graphical symbols and circuit diagrams - part 1: Graphical symbols for conventional use and data-processing applications. Technical Committee: ISO/TC 131 Fluid power systems, 3 -rd ed., p. 178, https://www.iso.org/standard/60184.html
*** (2018) ISO 1219-2:2012(en), Fluid power systems and components -Graphical symbols and circuit diagrams - part 2: Circuit diagrams. Technical Committee: ISO/TC 131 Fluid power systems, 2-nd ed., p. 42, https://www.iso.org/standard/51200.html
*** (2016) ISO 1219-3:2016(en) fluid power systems and components - graphical symbols and circuit diagrams - part 3: Symbol modules and connected symbols in circuit diagrams. Technical Committee: ISO/TC 131/SC 1 Symbols, terminology and classifications, 1 - st ed., p. 23, https://www.iso.org/standard/62614.html
Cosford, J. (2016) Ag machinery relies on the versatility of hydraulics. in: Mobile Hydraulic Tips: A Fluid Power World Resource, https://www.mobilehydraulictips.com/ag-machineryrelies-versatility-hydraulics
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Petrović, D.V., Vera, C.B. (2019) Hidraulički simboli - deo I - opšti simboli i oznake mernih instrumenata i indikatora. Poljoprivredna tehnika, vol. 44, br. 1, str. 45-56
Petrović, D.V., Cerović, V.B. (2019) Hidraulički simboli - deo II - pumpe i izvršni organi. Poljoprivredna tehnika, vol. 44, br. 2, str. 1-12
Petrović, D.V., Cerović, V.B. (2019) Hidraulički simboli - deo III - ventili. Poljoprivredna tehnika, vol. 44, br. 3, str. 1-16
Trinkel, E. (2017) Fluid power basics. Penton Media, Inc, 1 -st eBook e, https://www.hydraulicspneumatics.com
 

About

article language: Serbian
document type: Review Paper
DOI: 10.5937/PoljTeh1904001P
published in SCIndeks: 14/12/2019

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