{"id":18513,"date":"2025-07-23T12:33:42","date_gmt":"2025-07-23T12:33:42","guid":{"rendered":"https:\/\/oudianvalve.com\/?p=18513"},"modified":"2025-07-23T12:40:44","modified_gmt":"2025-07-23T12:40:44","slug":"cv-flow-coefficients-of-gate-valves","status":"publish","type":"post","link":"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/","title":{"rendered":"Coefficients de d\u00e9bit Cv des vannes \u00e0 guillotine"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 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\">Table des mati\u00e8res<\/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;\">Basculer<\/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-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Cv_Flow_Coefficients_of_Gate_Valves\" >Coefficients de d\u00e9bit Cv des vannes \u00e0 guillotine<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#1_Definition_of_Cv\" >1. D\u00e9finition de Cv<\/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:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Formula\" >Formule:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#2_Typical_Cv_Values_for_Gate_Valves\" >2. Valeurs typiques du coefficient de variation (Cv) des vannes \u00e0 guillotine<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Notes\" >Remarques :<\/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:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#3_Factors_Affecting_Cv\" >3. Facteurs influen\u00e7ant le CV<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#4_Calculating_Required_Cv_for_a_System\" >4. Calcul du CV requis pour un syst\u00e8me<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Example_Calculation\" >Exemple de calcul\u00a0:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#5_Comparing_Cv_with_Other_Valve_Types\" >5. Comparaison du Cv avec d&#039;autres types de vannes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Key_Takeaway\" >Points cl\u00e9s \u00e0 retenir\u00a0:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#6_Industry_Standards_for_Cv_Testing\" >6. Normes industrielles pour les essais CV<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/oudianvalve.com\/fr\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"Cv_Flow_Coefficients_of_Gate_Valves\"><\/span><strong>Coefficients de d\u00e9bit Cv des vannes \u00e0 guillotine<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p class=\"ds-markdown-paragraph\">Le\u00a0<strong>Cv (coefficient de d\u00e9bit)<\/strong>\u00a0Le coefficient de d\u00e9bit d&#039;une vanne mesure sa capacit\u00e9 d&#039;\u00e9coulement dans des conditions sp\u00e9cifiques. Il s&#039;agit d&#039;un param\u00e8tre essentiel pour choisir la taille de vanne appropri\u00e9e et pr\u00e9voir la perte de charge.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"1_Definition_of_Cv\"><\/span><strong>1. D\u00e9finition de Cv<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Le\u00a0<strong>Valeur CV<\/strong>\u00a0est d\u00e9fini comme\u00a0:<\/p>\n<blockquote>\n<p class=\"ds-markdown-paragraph\"><strong>Le nombre de gallons am\u00e9ricains par minute (GPM) d&#039;eau \u00e0 60 \u00b0F qui passeront \u00e0 travers une vanne compl\u00e8tement ouverte avec une chute de pression de 1 psi.<\/strong><\/p>\n<\/blockquote>\n<h3><span class=\"ez-toc-section\" id=\"Formula\"><\/span><strong>Formule:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span class=\"katex-display ds-markdown-math\"><span class=\"katex\"><span class=\"katex-mathml\">Cv=QSG\u0394P<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">C<\/span><span class=\"mord mathnormal\">v<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord mathnormal\">Q<\/span><span class=\"mord sqrt\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"svg-align\"><span class=\"mord\"><span class=\"mfrac\">\u0394<span class=\"mord mathnormal\">P<\/span><span class=\"mord mathnormal\">SG<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p class=\"ds-markdown-paragraph\">O\u00f9:<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Q<\/strong>\u00a0= D\u00e9bit (GPM)<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>SG<\/strong>\u00a0= Densit\u00e9 relative du fluide (1 pour l&#039;eau)<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>\u0394P<\/strong>\u00a0= Chute de pression (psi)<\/p>\n<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"2_Typical_Cv_Values_for_Gate_Valves\"><\/span><strong>2. Valeurs typiques du coefficient de variation (Cv) des vannes \u00e0 guillotine<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Les vannes \u00e0 guillotine ont une haute\u00a0<strong>Valeurs de CV<\/strong>\u00a0car elles offrent une restriction de d\u00e9bit minimale lorsqu&#039;elles sont compl\u00e8tement ouvertes. Ci-dessous, des valeurs approximatives\u00a0<strong>Plages de CV<\/strong>\u00a0pour diff\u00e9rentes tailles :<\/p>\n<div class=\"markdown-table-wrapper\">\n<table>\n<thead>\n<tr>\n<th><strong>Taille de la valve (pouces)<\/strong><\/th>\n<th><strong>CV (Port complet)<\/strong><\/th>\n<th><strong>CV (Port standard)<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u00bd\u201d<\/td>\n<td>15 \u2013 20<\/td>\n<td>10 \u2013 15<\/td>\n<\/tr>\n<tr>\n<td>1\u2033<\/td>\n<td>35 \u2013 50<\/td>\n<td>25 \u2013 35<\/td>\n<\/tr>\n<tr>\n<td>2\u2033<\/td>\n<td>120 \u2013 150<\/td>\n<td>80 \u2013 100<\/td>\n<\/tr>\n<tr>\n<td>4\u2033<\/td>\n<td>450 \u2013 600<\/td>\n<td>300 \u2013 400<\/td>\n<\/tr>\n<tr>\n<td>6\u2033<\/td>\n<td>900 \u2013 1 200<\/td>\n<td>600 \u2013 800<\/td>\n<\/tr>\n<tr>\n<td>8\u2033<\/td>\n<td>1 600 \u2013 2 000<\/td>\n<td>1 000 \u2013 1 400<\/td>\n<\/tr>\n<tr>\n<td>10\u2033<\/td>\n<td>2 500 \u2013 3 200<\/td>\n<td>1 600 \u2013 2 200<\/td>\n<\/tr>\n<tr>\n<td>12\u2033<\/td>\n<td>3 600 \u2013 4 500<\/td>\n<td>2 400 \u2013 3 000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table class=\"table table-bordered table-striped table-hover\" style=\"height: 917px;\" width=\"1068\">\n<thead>\n<tr>\n<th>Taille<\/th>\n<th>Taille<\/th>\n<th colspan=\"3\">Classe 150<\/th>\n<th colspan=\"3\">Classe 300<\/th>\n<th colspan=\"3\">Classe 600<\/th>\n<th colspan=\"3\">Classe 900<\/th>\n<th colspan=\"3\">Classe 1500<\/th>\n<th colspan=\"3\">Classe 2500<\/th>\n<\/tr>\n<\/thead>\n<tbody id=\"cvdata\">\n<tr>\n<td>NPS<\/td>\n<td>DN<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Vanne de pipeline australienne<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Vanne de pipeline australienne<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Vanne de pipeline australienne<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Vanne de pipeline australienne<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Vanne de pipeline australienne<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Vanne de pipeline australienne<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>50<\/td>\n<td>260<\/td>\n<td>200<\/td>\n<td>311<\/td>\n<td>260<\/td>\n<td>200<\/td>\n<td>311<\/td>\n<td>260<\/td>\n<td>200<\/td>\n<td>311<\/td>\n<td>230<\/td>\n<td>155<\/td>\n<td>273<\/td>\n<td>230<\/td>\n<td>200<\/td>\n<td>273<\/td>\n<td>\u2013<\/td>\n<td>164<\/td>\n<td>170<\/td>\n<\/tr>\n<tr>\n<td>2\u00bd<\/td>\n<td>65<\/td>\n<td>420<\/td>\n<td>\u2013<\/td>\n<td>495<\/td>\n<td>420<\/td>\n<td>\u2013<\/td>\n<td>495<\/td>\n<td>420<\/td>\n<td>\u2013<\/td>\n<td>495<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>397<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>397<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>273<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>80<\/td>\n<td>625<\/td>\n<td>710<\/td>\n<td>72<\/td>\n<td>625<\/td>\n<td>710<\/td>\n<td>72<\/td>\n<td>625<\/td>\n<td>710<\/td>\n<td>724<\/td>\n<td>560<\/td>\n<td>650<\/td>\n<td>665<\/td>\n<td>510<\/td>\n<td>600<\/td>\n<td>604<\/td>\n<td>\u2013<\/td>\n<td>275<\/td>\n<td>397<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>100<\/td>\n<td>1150<\/td>\n<td>1300<\/td>\n<td>1320<\/td>\n<td>1150<\/td>\n<td>1300<\/td>\n<td>1320<\/td>\n<td>1150<\/td>\n<td>1300<\/td>\n<td>1320<\/td>\n<td>1050<\/td>\n<td>1200<\/td>\n<td>1239<\/td>\n<td>925<\/td>\n<td>1070<\/td>\n<td>1078<\/td>\n<td>\u2013<\/td>\n<td>460<\/td>\n<td>660<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>150<\/td>\n<td>2650<\/td>\n<td>3100<\/td>\n<td>3076<\/td>\n<td>2650<\/td>\n<td>3100<\/td>\n<td>3076<\/td>\n<td>2650<\/td>\n<td>3100<\/td>\n<td>3076<\/td>\n<td>2400<\/td>\n<td>2850<\/td>\n<td>2815<\/td>\n<td>2100<\/td>\n<td>2500<\/td>\n<td>2450<\/td>\n<td>\u2013<\/td>\n<td>1100<\/td>\n<td>1588<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>200<\/td>\n<td>4850<\/td>\n<td>5720<\/td>\n<td>5608<\/td>\n<td>4850<\/td>\n<td>5720<\/td>\n<td>5608<\/td>\n<td>4850<\/td>\n<td>5500<\/td>\n<td>5434<\/td>\n<td>4200<\/td>\n<td>5025<\/td>\n<td>4901<\/td>\n<td>3650<\/td>\n<td>4370<\/td>\n<td>4244<\/td>\n<td>\u2013<\/td>\n<td>1970<\/td>\n<td>2815<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>250<\/td>\n<td>7750<\/td>\n<td>8940<\/td>\n<td>8834<\/td>\n<td>7750<\/td>\n<td>8940<\/td>\n<td>8834<\/td>\n<td>7750<\/td>\n<td>8485<\/td>\n<td>8474<\/td>\n<td>6750<\/td>\n<td>7850<\/td>\n<td>7817<\/td>\n<td>5850<\/td>\n<td>6850<\/td>\n<td>6761<\/td>\n<td>\u2013<\/td>\n<td>3130<\/td>\n<td>4566<\/td>\n<\/tr>\n<tr>\n<td>12<\/td>\n<td>300<\/td>\n<td>11500<\/td>\n<td>13350<\/td>\n<td>13071<\/td>\n<td>11500<\/td>\n<td>13350<\/td>\n<td>13071<\/td>\n<td>11500<\/td>\n<td>12850<\/td>\n<td>12509<\/td>\n<td>9700<\/td>\n<td>11500<\/td>\n<td>11171<\/td>\n<td>\u2013<\/td>\n<td>9980<\/td>\n<td>9657<\/td>\n<td>\u2013<\/td>\n<td>4535<\/td>\n<td>6553<\/td>\n<\/tr>\n<tr>\n<td>14<\/td>\n<td>350<\/td>\n<td>14000<\/td>\n<td>16275<\/td>\n<td>16074<\/td>\n<td>14000<\/td>\n<td>16275<\/td>\n<td>16074<\/td>\n<td>13000<\/td>\n<td>15370<\/td>\n<td>15151<\/td>\n<td>12000<\/td>\n<td>13900<\/td>\n<td>13646<\/td>\n<td>\u2013<\/td>\n<td>12000<\/td>\n<td>11701<\/td>\n<td>\u2013<\/td>\n<td>8368<\/td>\n<td>8027<\/td>\n<\/tr>\n<tr>\n<td>16<\/td>\n<td>400<\/td>\n<td>19000<\/td>\n<td>21560<\/td>\n<td>21554<\/td>\n<td>19000<\/td>\n<td>21560<\/td>\n<td>21554<\/td>\n<td>18000<\/td>\n<td>20170<\/td>\n<td>20106<\/td>\n<td>16000<\/td>\n<td>18150<\/td>\n<td>18031<\/td>\n<td>\u2013<\/td>\n<td>15675<\/td>\n<td>15447<\/td>\n<td>\u2013<\/td>\n<td>10955<\/td>\n<td>10633<\/td>\n<\/tr>\n<tr>\n<td>18<\/td>\n<td>450<\/td>\n<td>24000<\/td>\n<td>28720<\/td>\n<td>27876<\/td>\n<td>23500<\/td>\n<td>28790<\/td>\n<td>27876<\/td>\n<td>22000<\/td>\n<td>26200<\/td>\n<td>25406<\/td>\n<td>\u2013<\/td>\n<td>23910<\/td>\n<td>23056<\/td>\n<td>\u2013<\/td>\n<td>20640<\/td>\n<td>19766<\/td>\n<td>\u2013<\/td>\n<td>14481<\/td>\n<td>13646<\/td>\n<\/tr>\n<tr>\n<td>20<\/td>\n<td>500<\/td>\n<td>31000<\/td>\n<td>35760<\/td>\n<td>35048<\/td>\n<td>30000<\/td>\n<td>34840<\/td>\n<td>35048<\/td>\n<td>27000<\/td>\n<td>32100<\/td>\n<td>31355<\/td>\n<td>\u2013<\/td>\n<td>29550<\/td>\n<td>28726<\/td>\n<td>\u2013<\/td>\n<td>25880<\/td>\n<td>25022<\/td>\n<td>\u2013<\/td>\n<td>17587<\/td>\n<td>16713<\/td>\n<\/tr>\n<tr>\n<td>24<\/td>\n<td>600<\/td>\n<td>45000<\/td>\n<td>52165<\/td>\n<td>51973<\/td>\n<td>44000<\/td>\n<td>51050<\/td>\n<td>51973<\/td>\n<td>40000<\/td>\n<td>46750<\/td>\n<td>46312<\/td>\n<td>\u2013<\/td>\n<td>42570<\/td>\n<td>42027<\/td>\n<td>\u2013<\/td>\n<td>31175<\/td>\n<td>36507<\/td>\n<td>\u2013<\/td>\n<td>21338<\/td>\n<td>24610<\/td>\n<\/tr>\n<tr>\n<td>26<\/td>\n<td>650<\/td>\n<td>53000<\/td>\n<td>63500<\/td>\n<td>61714<\/td>\n<td>53000<\/td>\n<td>62011<\/td>\n<td>61714<\/td>\n<td>38000<\/td>\n<td>56300<\/td>\n<td>54333<\/td>\n<td>\u2013<\/td>\n<td>52167<\/td>\n<td>49668<\/td>\n<td>\u2013<\/td>\n<td>45514<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>28<\/td>\n<td>700<\/td>\n<td>62000<\/td>\n<td>74800<\/td>\n<td>72387<\/td>\n<td>62000<\/td>\n<td>73046<\/td>\n<td>72387<\/td>\n<td>52000<\/td>\n<td>65900<\/td>\n<td>63023<\/td>\n<td>\u2013<\/td>\n<td>60500<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>53320<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>30<\/td>\n<td>750<\/td>\n<td>73000<\/td>\n<td>86325<\/td>\n<td>83919<\/td>\n<td>73000<\/td>\n<td>84765<\/td>\n<td>83919<\/td>\n<td>82500<\/td>\n<td>75520<\/td>\n<td>73110<\/td>\n<td>\u2013<\/td>\n<td>69452<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>61095<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>32<\/td>\n<td>800<\/td>\n<td>81000<\/td>\n<td>103000<\/td>\n<td>\u2013<\/td>\n<td>81000<\/td>\n<td>100580<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>85180<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>79092<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>73478<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>34<\/td>\n<td>850<\/td>\n<td>92500<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>82500<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>36<\/td>\n<td>900<\/td>\n<td>108000<\/td>\n<td>129500<\/td>\n<td>119333<\/td>\n<td>108000<\/td>\n<td>125825<\/td>\n<td>119333<\/td>\n<td>72000<\/td>\n<td>114250<\/td>\n<td>114881<\/td>\n<td>\u2013<\/td>\n<td>103212<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>96862<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>38<\/td>\n<td>950<\/td>\n<td>11500<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>103000<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>40<\/td>\n<td>1000<\/td>\n<td>130000<\/td>\n<td>175860<\/td>\n<td>\u2013<\/td>\n<td>129500<\/td>\n<td>171740<\/td>\n<td>\u2013<\/td>\n<td>115000<\/td>\n<td>156127<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>42<\/td>\n<td>1050<\/td>\n<td>142000<\/td>\n<td>223300<\/td>\n<td>163380<\/td>\n<td>129500<\/td>\n<td>217000<\/td>\n<td>163380<\/td>\n<td>\u2013<\/td>\n<td>197272<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>44<\/td>\n<td>1100<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>144000<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>46<\/td>\n<td>1150<\/td>\n<td>171000<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>48<\/td>\n<td>1200<\/td>\n<td>190000<\/td>\n<td>335500<\/td>\n<td>215888<\/td>\n<td>\u2013<\/td>\n<td>326000<\/td>\n<td>215888<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>50<\/td>\n<td>1250<\/td>\n<td>198000<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>190000<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>54<\/td>\n<td>1350<\/td>\n<td>238000<\/td>\n<td>\u2013<\/td>\n<td>278938<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>278938<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>56<\/td>\n<td>1400<\/td>\n<td>260000<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>60<\/td>\n<td>1500<\/td>\n<td>300000<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<\/tr>\n<tr>\n<td>64<\/td>\n<td>1600<\/td>\n<td>340000<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td>\u2013<\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Notes\"><\/span><strong>Remarques :<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>vannes \u00e0 passage int\u00e9gral<\/strong>\u00a0avoir un niveau plus \u00e9lev\u00e9\u00a0<strong>CV<\/strong>\u00a0car leur diam\u00e8tre int\u00e9rieur correspond au diam\u00e8tre int\u00e9rieur du tuyau.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>vannes \u00e0 passage standard (r\u00e9duit)<\/strong>\u00a0avoir un al\u00e9sage l\u00e9g\u00e8rement plus petit, r\u00e9duisant\u00a0<strong>CV<\/strong>\u00a0par ~20-30%.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Le coefficient de variation (Cv) augmente avec la taille de la valve.<\/strong>\u00a0en raison d&#039;une section de passage plus importante.<\/p>\n<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"3_Factors_Affecting_Cv\"><\/span><strong>3. Facteurs influen\u00e7ant le CV<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol start=\"1\">\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Conception de vannes<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Port complet vs. port standard<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Type de coin (solide, flexible, fendu)<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Conditions d&#039;\u00e9coulement<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">\u00c9coulement turbulent vs. \u00e9coulement laminaire<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Effets de la viscosit\u00e9 (une viscosit\u00e9 plus \u00e9lev\u00e9e r\u00e9duit le Cv)<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Chute de pression (\u0394P)<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Une valeur de \u0394P plus \u00e9lev\u00e9e augmente le d\u00e9bit mais peut provoquer de la cavitation.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Propri\u00e9t\u00e9s des fluides<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">La densit\u00e9 relative (SG) et la temp\u00e9rature affectent le coefficient de variation (Cv).<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"4_Calculating_Required_Cv_for_a_System\"><\/span><strong>4. Calcul du CV requis pour un syst\u00e8me<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Pour s\u00e9lectionner la taille de vanne appropri\u00e9e, les ing\u00e9nieurs calculent les besoins\u00a0<strong>CV<\/strong>\u00a0en fonction des conditions du syst\u00e8me\u00a0:<\/p>\n<p><span class=\"katex-display ds-markdown-math\"><span class=\"katex\"><span class=\"katex-mathml\">Cv=Q\u0394PSG<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">C<\/span><span class=\"mord mathnormal\">v<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord sqrt\"><span class=\"svg-align\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">SG<\/span><\/span><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">\u0394<span class=\"mord mathnormal mtight\">P<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"mord mathnormal\">Q<\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Example_Calculation\"><\/span><strong>Exemple de calcul\u00a0:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>D\u00e9bit (Q) :<\/strong>\u00a0100 GPM<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Chute de pression (\u0394P) :<\/strong>\u00a05 psi<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Densit\u00e9 relative (SG) :<\/strong>\u00a01 (eau)<\/p>\n<\/li>\n<\/ul>\n<p><span class=\"katex-display ds-markdown-math\"><span class=\"katex\"><span class=\"katex-mathml\">Cv=10051=1002,236\u224844,7<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">C<\/span><span class=\"mord mathnormal\">v<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord sqrt\"><span class=\"svg-align\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">5<\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span>100<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\">2.236100<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">\u2248<\/span><\/span><span class=\"base\"><span class=\"mord\">44.7<\/span><\/span><\/span><\/span><\/span><\/p>\n<p class=\"ds-markdown-paragraph\">UN\u00a0<strong>Vanne \u00e0 guillotine \u00e0 passage int\u00e9gral 2\u2033 (Cv \u2248 120-150)<\/strong>\u00a0Cela serait plus que suffisant.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"5_Comparing_Cv_with_Other_Valve_Types\"><\/span><strong>5. Comparaison du Cv avec d&#039;autres types de vannes<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"markdown-table-wrapper\">\n<table>\n<thead>\n<tr>\n<th><strong>Type de vanne<\/strong><\/th>\n<th><strong>CV typique (soupape de 2 pouces)<\/strong><\/th>\n<th><strong>Efficacit\u00e9 du d\u00e9bit<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>vanne \u00e0 guillotine<\/strong><\/td>\n<td>120 \u2013 150 (port plein)<\/td>\n<td>Tr\u00e8s \u00e9lev\u00e9<\/td>\n<\/tr>\n<tr>\n<td><strong>Robinet \u00e0 boisseau sph\u00e9rique<\/strong><\/td>\n<td>150 \u2013 200 (port complet)<\/td>\n<td>Haut<\/td>\n<\/tr>\n<tr>\n<td><strong>Robinet \u00e0 soupape<\/strong><\/td>\n<td>30 \u2013 50<\/td>\n<td>Mod\u00e9r\u00e9<\/td>\n<\/tr>\n<tr>\n<td><strong>vanne papillon<\/strong><\/td>\n<td>80 \u2013 120<\/td>\n<td>Haut<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Key_Takeaway\"><\/span><strong>Points cl\u00e9s \u00e0 retenir\u00a0:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Les vannes \u00e0 guillotine ont une excellente capacit\u00e9 de d\u00e9bit (Cv \u00e9lev\u00e9).<\/strong>\u00a0mais ne sont pas id\u00e9aux pour la limitation de d\u00e9bit.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>vannes \u00e0 bille et \u00e0 papillon<\/strong>\u00a0peut avoir une valeur l\u00e9g\u00e8rement plus \u00e9lev\u00e9e\u00a0<strong>CV<\/strong>\u00a0mais servent des objectifs diff\u00e9rents.<\/p>\n<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"6_Industry_Standards_for_Cv_Testing\"><\/span><strong>6. Normes industrielles pour les essais CV<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ANSI\/FCI 70-2<\/strong>\u00a0\u2013 Norme pour les coefficients de d\u00e9bit des vannes de r\u00e9gulation.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ISA-75.01.01<\/strong>\u00a0\u2013 \u00c9quations de d\u00e9bit pour le dimensionnement des vannes de r\u00e9gulation (parfois utilis\u00e9es pour les vannes manuelles).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ISO 5208<\/strong>\u00a0\u2013 Tests de vannes industrielles (y compris les contr\u00f4les d&#039;\u00e9tanch\u00e9it\u00e9 et de capacit\u00e9 de d\u00e9bit).<\/p>\n<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Le\u00a0<strong>Valeur CV<\/strong>\u00a0Le choix de la taille appropri\u00e9e de la vanne \u00e0 guillotine est crucial pour minimiser la perte de charge et garantir un d\u00e9bit efficace. Les vannes \u00e0 guillotine \u00e0 passage int\u00e9gral offrent les meilleures performances.\u00a0<strong>CV<\/strong>, ce qui les rend id\u00e9aux pour les applications \u00e0 faible r\u00e9sistance.<\/p>","protected":false},"excerpt":{"rendered":"<p>Cv Flow Coefficients of Gate Valves The\u00a0Cv (Flow Coefficient)\u00a0of a valve measures its flow capacity under specific conditions. It is a critical parameter for selecting the right valve size and predicting pressure drop. 1. Definition of Cv The\u00a0Cv value\u00a0is defined as: The number of US gallons per minute (GPM) of water at 60\u00b0F that will [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[624],"class_list":["post-18513","post","type-post","status-publish","format-standard","hentry","category-industry-news","tag-cv-flow-coefficients-of-gate-valves"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/posts\/18513","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/comments?post=18513"}],"version-history":[{"count":2,"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/posts\/18513\/revisions"}],"predecessor-version":[{"id":18515,"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/posts\/18513\/revisions\/18515"}],"wp:attachment":[{"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/media?parent=18513"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/categories?post=18513"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/tags?post=18513"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}