{"id":68115,"date":"2024-01-25T11:20:34","date_gmt":"2024-01-25T08:20:34","guid":{"rendered":"https:\/\/unox.com.tr\/what-is-a-control-valve-and-what-is-its-purpose\/"},"modified":"2025-12-29T12:52:23","modified_gmt":"2025-12-29T09:52:23","slug":"what-is-a-control-valve-and-what-is-its-purpose","status":"publish","type":"post","link":"https:\/\/unox.com.tr\/en\/what-is-a-control-valve-and-what-is-its-purpose\/","title":{"rendered":"What Is a Control Valve and What Is Its Purpose?"},"content":{"rendered":"<p><a href=\"https:\/\/unox.com.tr\/en\/control-valves\/\">A control valve<\/a> is a type of valve used to regulate the flow, pressure, level, or even direction of a fluid based on the needs of a process. Control valves are available in various designs, such as ball valves, butterfly valves, diaphragm valves, and more.  <\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Sayfa \u0130\u00e7eri\u011fi<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-control-valve-and-what-is-its-purpose\/#Control_Valve_Applications\" >Control Valve Applications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-control-valve-and-what-is-its-purpose\/#Control_Valve_Components\" >Control Valve Components<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-control-valve-and-what-is-its-purpose\/#Temperature_Control\" >Temperature Control:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-control-valve-and-what-is-its-purpose\/#How_Does_a_Positioner_Work\" >How Does a Positioner Work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-control-valve-and-what-is-its-purpose\/#What_Is_the_Difference_Between_a_Positioner_and_an_IP_Converter\" >What Is the Difference Between a Positioner and an I\/P Converter?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-control-valve-and-what-is-its-purpose\/#Key_Considerations_for_Selecting_a_Control_Valve\" >Key Considerations for Selecting a Control Valve<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Control_Valve_Applications\"><\/span><strong>Control Valve Applications<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Most of us want to control various process parameters such as temperature, pressure, and level. To achieve this, it is clear that you need a controller, such as a Programmable Logic Controller (PLC). <\/p>\n<p>Some sensors and transmitters also need to send data to the PLC or DCS. Finally, you need a device (often called the &#8220;final control element&#8221;) to execute the commands from the PLC. <\/p>\n<p>Actuators include pumps, heaters, control valves, and similar devices. <\/p>\n<p>Typically, these control valves are not used in fully open or fully closed positions. Proportional control valves with specially designed throttling plates are used to restrict flow or regulate flow rate. This allows you to, for example, control the heating time of a furnace, the filling rate of a tank, or reduce the pressure in a line.  <\/p>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"768\" height=\"445\" src=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-nedir-768x445.jpg\" alt=\"\" srcset=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-nedir-768x445.jpg 768w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-nedir-150x87.jpg 150w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-nedir-600x348.jpg 600w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-nedir-300x174.jpg 300w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-nedir-1024x594.jpg 1024w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-nedir.jpg 1250w\" sizes=\"(max-width: 768px) 100vw, 768px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Control_Valve_Components\"><\/span><strong>Control Valve Components<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Body: The part through which the fluid passes and comes into contact is called the body.<\/p>\n<p>Actuator: The actuator can be electric or pneumatic and allows the valve to open and close using auxiliary power.<\/p>\n<p>Trim elemanlar: Sit, klepe ve klepe mili olarak adland\u0131rl\u0131r bu k\u0131s\u0131mlar paslanmaz malzemeden olu\u015fup ak\u0131\u015fganlar temas eden k\u0131s\u0131mlard\u0131r ve farkl\u0131 uygulamalarda farkl\u0131 malzeme \u00e7e\u015fitleri kullan\u0131labilir.<\/p>\n<p>Positioner: Typically used to send commands to a pneumatic actuator, positioners come in types such as with or without feedback, self-calibrating, or HART protocol compatible. The main types are electro-pneumatic positioners, pneumatic-pneumatic positioners, and digital positioners. <\/p>\n<p>Application Examples of Globe Control Valves with Positioners<\/p>\n<ul>\n<li>\n<h3><span class=\"ez-toc-section\" id=\"Temperature_Control\"><\/span><strong>Temperature Control: <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p>For example, to lower the temperature or maintain it at a desired level, you should connect a measurement device on the pipeline (such as a PT100) that provides a digital output to a controller via cable. The controller processes the digital information from the temperature sensor and sends a 4\u201320 mA signal to the electro-pneumatic positioner on the control valve.  Thanks to this signal, the control valve moves in the throttling or opening direction.<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"699\" height=\"702\" src=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog.jpg\" alt=\"\" srcset=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog.jpg 699w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog-300x300.jpg 300w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog-150x150.jpg 150w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog-600x603.jpg 600w\" sizes=\"(max-width: 699px) 100vw, 699px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p style=\"text-align: center;\">Control Valve<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"557\" src=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/pt100-1024x557.jpg\" alt=\"\" srcset=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/pt100-1024x557.jpg 1024w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/pt100-150x82.jpg 150w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/pt100-600x327.jpg 600w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/pt100-300x163.jpg 300w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/pt100-768x418.jpg 768w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/pt100-1536x836.jpg 1536w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/pt100.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p style=\"text-align: center;\">PT 100<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"680\" height=\"656\" src=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog.jpg\" alt=\"\" srcset=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog.jpg 680w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog-150x145.jpg 150w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog-600x579.jpg 600w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog-300x289.jpg 300w\" sizes=\"(max-width: 680px) 100vw, 680px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p style=\"text-align: center;\">Controller<\/p>\n<ul>\n<li>Flow Control: The digital data from a flow meter is transmitted to the controller via cable. The controller determines whether the flow is too low or too high. If the flow is low, the controller sends a signal to the positioner to open the valve. If the flow is high, it sends a signal to the positioner to close the valve. This process continues until the flow reaches the set value on the controller.    <\/li>\n<\/ul>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"699\" height=\"702\" src=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog.jpg\" alt=\"\" srcset=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog.jpg 699w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog-300x300.jpg 300w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog-150x150.jpg 150w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog-600x603.jpg 600w\" sizes=\"(max-width: 699px) 100vw, 699px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p style=\"text-align: center;\">Control Valve<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"562\" src=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/debimetre-blog-1024x562.jpg\" alt=\"\" srcset=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/debimetre-blog-1024x562.jpg 1024w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/debimetre-blog-150x82.jpg 150w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/debimetre-blog-600x329.jpg 600w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/debimetre-blog-300x165.jpg 300w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/debimetre-blog-768x421.jpg 768w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/debimetre-blog-1536x843.jpg 1536w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/debimetre-blog.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p style=\"text-align: center;\">Flow Meter<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"680\" height=\"656\" src=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog.jpg\" alt=\"\" srcset=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog.jpg 680w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog-150x145.jpg 150w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog-600x579.jpg 600w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog-300x289.jpg 300w\" sizes=\"(max-width: 680px) 100vw, 680px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p style=\"text-align: center;\">Controller<\/p>\n<ul>\n<li>Pressure Control: The digital pressure data transmitted by a pressure sensor (transmitter) is sent to the controller via cable. If the pressure is below the desired value, the controller sends a signal to the positioner to open. If the pressure is above the desired value, the controller sends a throttling signal to the positioner. Until the pressure values set on the controller are reached.<\/li>\n<\/ul>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"699\" height=\"702\" src=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog.jpg\" alt=\"\" srcset=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog.jpg 699w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog-300x300.jpg 300w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog-150x150.jpg 150w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-vanasi-blog-600x603.jpg 600w\" sizes=\"(max-width: 699px) 100vw, 699px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p style=\"text-align: center;\">Control Valve<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"266\" height=\"300\" src=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/transmitter-blog-266x300.jpg\" alt=\"\" srcset=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/transmitter-blog-266x300.jpg 266w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/transmitter-blog-150x169.jpg 150w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/transmitter-blog-600x675.jpg 600w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/transmitter-blog.jpg 620w\" sizes=\"(max-width: 266px) 100vw, 266px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p style=\"text-align: center;\">Transmitter<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"680\" height=\"656\" src=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog.jpg\" alt=\"\" srcset=\"https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog.jpg 680w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog-150x145.jpg 150w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog-600x579.jpg 600w, https:\/\/unox.com.tr\/wp-content\/uploads\/2024\/01\/kontrol-cihazi-blog-300x289.jpg 300w\" sizes=\"(max-width: 680px) 100vw, 680px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p style=\"text-align: center;\">Controller<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_Does_a_Positioner_Work\"><\/span><strong>How Does a Positioner Work?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A positioner converts the 4\u201320 mA DC signal received from a PLC (Programmable Logic Controller) into air pressure. It transforms the digitally received signal into proportional pneumatic output, allowing proportional control of the actuator. In short, an electro-pneumatic positioner converts an electrical current (I) into pneumatic pressure (P) using special internal mechanisms.   <\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Is_the_Difference_Between_a_Positioner_and_an_IP_Converter\"><\/span><strong>What Is the Difference Between a Positioner and an I\/P Converter?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>I\/P converters can control valves without the need for a controller, but their accuracy is not very high. For this reason, they are not commonly preferred. <\/p>\n<p> Since they are not integrated with any positioner, this means there is no feedback signal available.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Key_Considerations_for_Selecting_a_Control_Valve\"><\/span>Key Considerations for Selecting a Control Valve<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When selecting<a href=\"https:\/\/unox.com.tr\/en\/control-valves\/\"> a control valve, <\/a>the pressure, temperature, flow rate, and type of fluid must be carefully considered, and the selection should be made by experts. Internationally recognized sizing and calculation software is used for this purpose. If these programs are not used and the valve is incorrectly selected, the control valve may experience cavitation, causing vibration, excessive noise, and rapid deformation.  <\/p>\n<p>All the conditions mentioned above should be considered to ensure the valve operates with longevity and high precision.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A control valve is a type of valve used to regulate the flow, pressure, level, or even direction of a<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1736],"tags":[],"class_list":["post-68115","post","type-post","status-publish","format-standard","hentry","category-control-valve"],"_links":{"self":[{"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts\/68115","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/comments?post=68115"}],"version-history":[{"count":1,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts\/68115\/revisions"}],"predecessor-version":[{"id":68116,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts\/68115\/revisions\/68116"}],"wp:attachment":[{"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/media?parent=68115"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/categories?post=68115"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/tags?post=68115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}