{"id":2525,"date":"2024-10-29T10:25:53","date_gmt":"2024-10-29T10:25:53","guid":{"rendered":"https:\/\/www.ca-tz.org\/?post_type=glossary&#038;p=2525"},"modified":"2024-10-28T06:25:26","modified_gmt":"2024-10-28T06:25:26","slug":"control-valve-2","status":"publish","type":"glossary","link":"https:\/\/www.ca-tz.org\/index.php\/aircyclopedia\/control-valve-2\/","title":{"rendered":"Control valve"},"content":{"rendered":"\n<p>A valve that controls the compressed air flow, pressure, and direction in a network\/s.&nbsp; This is achieved by varying the size of the flow passage.&nbsp;&nbsp;<\/p>\n\n\n\n<p>The orifice opening or closing can be adjusted<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>manually by using hand wheel or handle&nbsp;<\/li>\n\n\n\n<li>automatically by using an actuator.<\/li>\n<\/ul>\n\n\n\n<p>The actuator is selected based on the type of movement of such valves, which could be either<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>linear profile and&nbsp;<\/li>\n\n\n\n<li>rotary profile<\/li>\n<\/ul>\n\n\n\n<p>The actuator is<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Diaphragm acting against spring tension<\/li>\n\n\n\n<li>Pinion &amp; cylinder acting against spring tension<\/li>\n\n\n\n<li>Pneumatic cylinder<\/li>\n\n\n\n<li>Electric motor<\/li>\n<\/ul>\n\n\n\n<p>The controlling element inside the valve could be:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>a stem or plug (linear movement) and<\/li>\n\n\n\n<li>disc or ball (rotary movement).<\/li>\n<\/ul>\n\n\n\n<p>The modulating (for gradually opening or closing an orifice) signal could be pneumatic, electric or hydraulic. The controlling signal could be based on&nbsp;failure to safety&nbsp;modes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&ldquo;Air or control signal failure to close&rdquo; &ndash; On failure of compressed air to the actuator, the valve closes under spring pressure or by backup power.<\/li>\n\n\n\n<li>&ldquo;Air or control signal failure to open&rdquo; &ndash; On failure of compressed air to actuator, the valve opens under spring pressure or by backup power.<\/li>\n<\/ul>\n\n\n\n<p>In case of electro-pneumatic positioners, the control signal is produced by a PID controller&nbsp;<\/p>\n\n\n\n<p>The control signal is converted by using various types of Positioners:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pneumatic<\/li>\n\n\n\n<li>Electro-pneumatic I to P Analogue<\/li>\n\n\n\n<li>Electro-pneumatic I to P Digital<\/li>\n<\/ul>\n\n\n\n<p><strong>Linear actuation movement<\/strong>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"480\" height=\"270\" src=\"https:\/\/www.ca-tz.org\/wp-content\/uploads\/2024\/10\/image244.gif\" alt=\"\" class=\"wp-image-3031\" style=\"width:838px;height:auto\"><\/figure>\n\n\n\n<p><strong>Rotary actuation movement<\/strong>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.ca-tz.org\/wp-content\/uploads\/2024\/10\/image242-1024x576.gif\" alt=\"\" class=\"wp-image-3032\" srcset=\"https:\/\/www.ca-tz.org\/wp-content\/uploads\/2024\/10\/image242-1024x576.gif 1024w, https:\/\/www.ca-tz.org\/wp-content\/uploads\/2024\/10\/image242-300x169.gif 300w, https:\/\/www.ca-tz.org\/wp-content\/uploads\/2024\/10\/image242-768x432.gif 768w, https:\/\/www.ca-tz.org\/wp-content\/uploads\/2024\/10\/image242-1140x641.gif 1140w, https:\/\/www.ca-tz.org\/wp-content\/uploads\/2024\/10\/image242-720x405.gif 720w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"960\" height=\"540\" src=\"https:\/\/www.ca-tz.org\/wp-content\/uploads\/2024\/10\/image231.gif\" alt=\"\" class=\"wp-image-3035\"><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>A valve that controls the compressed air flow, pressure, and direction in a network\/s.&nbsp; This is achieved by varying the size of the flow passage.&nbsp;&nbsp; The orifice opening or closing can be adjusted The actuator is selected based on the type of movement of such valves, which could be either The actuator is The controlling&hellip;<\/p>\n","protected":false},"author":8,"featured_media":0,"menu_order":0,"template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-2525","glossary","type-glossary","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ca-tz.org\/index.php\/wp-json\/wp\/v2\/glossary\/2525"}],"collection":[{"href":"https:\/\/www.ca-tz.org\/index.php\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/www.ca-tz.org\/index.php\/wp-json\/wp\/v2\/types\/glossary"}],"author":[{"embeddable":true,"href":"https:\/\/www.ca-tz.org\/index.php\/wp-json\/wp\/v2\/users\/8"}],"version-history":[{"count":3,"href":"https:\/\/www.ca-tz.org\/index.php\/wp-json\/wp\/v2\/glossary\/2525\/revisions"}],"predecessor-version":[{"id":3046,"href":"https:\/\/www.ca-tz.org\/index.php\/wp-json\/wp\/v2\/glossary\/2525\/revisions\/3046"}],"wp:attachment":[{"href":"https:\/\/www.ca-tz.org\/index.php\/wp-json\/wp\/v2\/media?parent=2525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}