{"id":9453,"date":"2022-12-02T13:50:43","date_gmt":"2022-12-02T13:50:43","guid":{"rendered":"https:\/\/about.ismacontrolli.com\/?p=9453"},"modified":"2023-03-07T08:33:43","modified_gmt":"2023-03-07T08:33:43","slug":"what-is-picv","status":"publish","type":"post","link":"https:\/\/about.ismacontrolli.com\/en\/what-is-picv\/","title":{"rendered":"What is PICV?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"9453\" class=\"elementor elementor-9453\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-752b591f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"752b591f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-70fbabaa\" data-id=\"70fbabaa\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-75ac6b59 elementor-widget elementor-widget-text-editor\" data-id=\"75ac6b59\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Energy saving is one of the important factors while designing a modern HVAC system.The automation system alone is not enough to build an energy-efficient system, field devices such as sensors, valves and actuators are no less important.<\/p><p><strong>What is needed to build a sustainable system in a building?<\/strong><\/p><p>The BMS must \u00a0properly control the heating\/cooling power delivered to the building by controlling the water flow to the coils. One of the energy-saving factors is to avoid overflow conditions which are responsible for high electrical power consumption by the circulating pumps, as well as efficiency loss of the heating\/cooling generators. \u00a0In this perspective, control valves need to modulate the flow according to the PID temperature loop, regardless of the unavoidable system pressure fluctuations. PICVs are the ideal for refrigeration, heating, or air conditioning systems.<\/p><p>Pressure Independent Control Valves popularly known as PICVs are control valves able to maintain a constant flow rate within a given range of differential pressure drops.<\/p><p><strong>PICV is three-in-one compact valve body<\/strong><\/p><ul><li style=\"list-style-type: none;\">\u00a0<\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>Control Valve<\/li><\/ul><\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>Differential pressure controller<\/li><\/ul><\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>Static flow limiting valve<\/li><\/ul><\/li><\/ul><figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"605\" height=\"149\" class=\"wp-image-9454\" src=\"https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz.png\" alt=\"\" srcset=\"https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz.png 605w, https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz-400x99.png 400w\" sizes=\"(max-width: 605px) 100vw, 605px\" \/><\/figure><p>A differential pressure controller in the valve body provides proportional control of the differential pressure across the control valve plug (P3-P4) and the resulting flow will depend only on the position of the flow control plug that is driven by the BMS. The BMS is therefore controlling the flow supplied to the coil and not simply the position of the valve.\u00a0<\/p><p>PICVs eliminate overflows regardless of fluctuating system pressure thus reducing the pumps energy consumption as well as avoiding \u2206T degradation and the following loss of efficiency of boiler\/chillers.<\/p><p><strong>\u00a0<\/strong><\/p><p><strong>PICV valve main parts, and the principle of operation<\/strong><\/p><hr class=\"wp-block-separator has-alpha-channel-opacity\" \/><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"611\" height=\"398\" class=\"wp-image-9457\" src=\"https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz-1.png\" alt=\"\" srcset=\"https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz-1.png 611w, https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz-1-400x261.png 400w\" sizes=\"(max-width: 611px) 100vw, 611px\" \/><\/figure><p>Q=Kv*\u221a\u2206P<\/p><p>Q \u2013 flow rate [l\/h]<\/p><p>Kv \u2013 valve opening\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p><p>\u2206P \u2013 differential pressure [bar];<\/p><p>\u2206P = P2 \u2013 P3, where P1 = inlet pressure; P2 = intermediate pressure; P3 = outlet pressure<\/p><p><strong>We need to keep \u2206P constant across the control valve plug<\/strong><\/p><p>In order for the valve to maintain a constant flow regardless of pressure changes, the differential \u2206P for P1-P4 must be in a range between Pmin and Pmax which is a specific technical characteristic of the valve. As long as the valve\u2019s differential pressure is in the Pmin-Pmax range, the flow will be constant.<\/p><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"316\" height=\"179\" class=\"wp-image-9460\" src=\"https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz-2.png\" alt=\"\" \/><\/figure><p><strong>\u00a0<\/strong><\/p><p><strong>LIBRA valve main components<\/strong><\/p><div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns: 67% auto;\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"354\" height=\"235\" class=\"wp-image-9463 size-full\" src=\"https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz-3.png\" alt=\"\" \/><\/figure><div class=\"wp-block-media-text__content\">\u00a0<\/div><\/div><p><strong>\u00a0<\/strong><\/p><p><strong>LIBRA &#8211; Main advantages of using PICVs<\/strong><\/p><ul><li style=\"list-style-type: none;\">\u00a0<\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>One PICV replaces up to three separate valves (a 2-way control valve, a flow limiting valve, a differential pressure control valve)<\/li><\/ul><\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>Optimum control in heating and cooling circuits with variable flow systems<\/li><\/ul><\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>Flow rate can be precisely set at its specified design value<\/li><\/ul><\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>Constant flow across the control valve regardless of changes in pump speed or valves closure elsewhere in the system<\/li><\/ul><\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>Authority close to 100%<\/li><\/ul><\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>Linear valve characteristics regardless of the preset value<\/li><\/ul><\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>100% stroke always available regardless of the preset value<\/li><\/ul><\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>No cartridge design<\/li><\/ul><\/li><\/ul><ul><li style=\"list-style-type: none;\"><ul><li>Very low hysteresis<\/li><\/ul><\/li><\/ul><p><strong>\u00a0<\/strong><\/p><p><strong>iSMA CONTROLLI \u00a0LIBRA &#8211; \u00a0Wide range of Pressure Independent Control Valves<\/strong><\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"575\" height=\"338\" class=\"wp-image-9466\" src=\"https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz-4.png\" alt=\"\" srcset=\"https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz-4.png 575w, https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/obraz-4-400x235.png 400w\" sizes=\"(max-width: 575px) 100vw, 575px\" \/><\/figure><p><strong>\u00a0<\/strong><\/p><p><strong>The importance of Energy Valves<\/strong><\/p><p>Heat exchange depends on the flow rate and \u2206T achieved on the heat exchanger. With the use of PICVs, we keep the flow independent from \u2206P but do not control \u2206T.<\/p><p>In that case, your application needs the use of energy valves that control both \u2206T and keep the flow independent from the pressure. Our EBV Energy Valves will be described in the coming soon article.<\/p><p>\u00a0<\/p><p>\u00a0<\/p><p>\u00a0<\/p><p>Author:<\/p><p><a href=\"https:\/\/www.linkedin.com\/in\/michal-charkiewicz-580799140\/\" target=\"_blank\" rel=\"noopener\">Micha\u0142 Charkiewicz<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5514bb0 elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"5514bb0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/www.linkedin.com\/in\/michal-charkiewicz-580799140\/\" target=\"_blank\" rel=\"noopener\">\n\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-linkedin\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3zM135.4 416H69V202.2h66.5V416zm-33.2-243c-21.3 0-38.5-17.3-38.5-38.5S80.9 96 102.2 96c21.2 0 38.5 17.3 38.5 38.5 0 21.3-17.2 38.5-38.5 38.5zm282.1 243h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9V416z\"><\/path><\/svg>\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Energy saving is one of the important factors while designing a modern HVAC system.The automation system alone is not enough to build an energy-efficient system, field devices such as sensors, valves and actuators are no less important. What is needed to build a sustainable system in a building? The BMS must \u00a0properly control the heating\/cooling [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":9479,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"tpgb_global_settings":"","_cbd_carousel_blocks":"[]","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jet_sm_ready_style":"","_jet_sm_style":"","_jet_sm_controls_values":"","_jet_sm_fonts_collection":"","_jet_sm_fonts_links":"","footnotes":""},"categories":[123],"tags":[104,34],"class_list":["post-9453","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-bms-en","tag-valves"],"acf":[],"tpgb_featured_images":{"full":["https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/Okladka-postu-min.png",1066,801,false],"tp-image-grid":["https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/Okladka-postu-min.png",700,526,false],"thumbnail":["https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/Okladka-postu-min-150x150.png",150,150,true],"medium":["https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/Okladka-postu-min-400x301.png",400,301,true],"medium_large":["https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/Okladka-postu-min-768x577.png",768,577,true],"large":["https:\/\/about.ismacontrolli.com\/wp-content\/uploads\/2022\/12\/Okladka-postu-min.png",1066,801,false],"default":"https:\/\/about.ismacontrolli.com\/wp-content\/plugins\/the-plus-addons-for-block-editor\/assets\/images\/tpgb-placeholder.jpg"},"tpgb_post_meta_info":{"get_date":"December 2, 2022","get_modified_date":"March 7, 2023","category_list":{"category":[{"term_id":123,"name":"blog","slug":"blog","term_group":0,"term_taxonomy_id":123,"taxonomy":"category","description":"","parent":0,"count":33,"filter":"raw"}],"post_tag":[{"term_id":104,"name":"BMS","slug":"bms-en","term_group":0,"term_taxonomy_id":104,"taxonomy":"post_tag","description":"","parent":0,"count":49,"filter":"raw"},{"term_id":34,"name":"valves","slug":"valves","term_group":0,"term_taxonomy_id":34,"taxonomy":"post_tag","description":"","parent":0,"count":2,"filter":"raw"}]},"author_name":"Magdalena Kraszewska","author_url":"https:\/\/about.ismacontrolli.com\/en\/author\/magdalena-kraszewska\/","author_email":"magdalena.kraszewska@ismacontrolli.com","author_website":"","author_description":"","author_facebook":"","author_twitter":"","author_instagram":"","author_role":["subscriber"],"author_firstname":"Magdalena","author_lastname":"Kraszewska","user_login":"Magdalena Kraszewska","author_avatar":"<img 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