<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0379-3982</journal-id>
<journal-title><![CDATA[Revista Tecnología en Marcha]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnología en Marcha]]></abbrev-journal-title>
<issn>0379-3982</issn>
<publisher>
<publisher-name><![CDATA[Instituto Tecnológico de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0379-39822021000100143</article-id>
<article-id pub-id-type="doi">10.18845/tm.v34i1.4821</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Prevención del golpe de ariete mediante el control del tiempo de cierre, al usar válvulas hidráulicas automatizadas]]></article-title>
<article-title xml:lang="en"><![CDATA[Prevention of water hammer through control of the closing time, in automated hydraulic valves]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara-Rodríguez]]></surname>
<given-names><![CDATA[Gregory]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Obando]]></surname>
<given-names><![CDATA[Adrian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quesada-Chanto]]></surname>
<given-names><![CDATA[Juan Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad EARTH  ]]></institution>
<addr-line><![CDATA[Guácimo ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Netafim  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,DOROT  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>34</volume>
<numero>1</numero>
<fpage>143</fpage>
<lpage>154</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0379-39822021000100143&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0379-39822021000100143&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0379-39822021000100143&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Uno de los grandes retos que enfrentamos, al calibrar sistemas automáticos en riego y acueductos, es que la velocidad de los activadores eléctricos es muy rápida, lo que reduce la velocidad de respuesta de las válvulas en términos de apertura y cierre a algunos cuantos segundos. Estos cierres repentinos en la línea de conducción provocan ondas en el interior de la tubería que producen sobrepresiones que pueden generar daños en nuestro acueducto. El presente trabajo ofrece un enfoque alternativo al control y prevención del golpe de ariete, al analizar la relación entre el tiempo de cierre de una válvula en una conducción con pendiente positiva, el respectivo aumento en la línea piozométrica y cómo se puede regular esto mediante la calibración de la velocidad de cierre en el llenado de la cámara superior de las válvulas hidráulicas. Para la comprobación de los resultados, se muestra el caso de un proyecto de invernaderos, hidropónico, que opera con riegos automáticos, donde el tiempo de apertura y cierre de válvulas fue calibrado mediante el control del llenado de las cámaras de las válvulas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract One of the greatest challenges we face when calibrating automatic systems in irrigation and aqueducts is the high speed of the electric actuators; it reduces the speed of response of the valves in terms of opening and closing to a few seconds. These sudden closures in the line of conduction promote waves inside the pipe that produce overpressures that may generate damages in the aqueduct. The present work is intended to offer an alternative approach to control and prevention of water hammer, by means of the analysis of the relationship between the closing time of the valve, in a conduction with positive slope; the respective increasing in the piezometric line, and how both can be regulated by calibration in the filling speed of the upper chamber of the hydraulic valves. To verify the results, the work shows a case study of a hydroponic greenhouse project that operates with automatic irrigation, where the valves closing time was calibrated by the filling control of the upper chamber of the hydraulic valves.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Golpe de ariete]]></kwd>
<kwd lng="es"><![CDATA[acueductos]]></kwd>
<kwd lng="es"><![CDATA[válvulas hidráulicas]]></kwd>
<kwd lng="en"><![CDATA[Water hammer]]></kwd>
<kwd lng="en"><![CDATA[aqueducts]]></kwd>
<kwd lng="en"><![CDATA[hydraulic valves]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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