{"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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/","title":{"rendered":"Cv Flow Coefficients of Gate Valves"},"content":{"rendered":"<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\">Table of Contents<\/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-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/oudianvalve.com\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Cv_Flow_Coefficients_of_Gate_Valves\" >Cv Flow Coefficients of Gate Valves<\/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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#1_Definition_of_Cv\" >1. Definition of 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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Formula\" >Formula:<\/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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#2_Typical_Cv_Values_for_Gate_Valves\" >2. Typical Cv Values for Gate Valves<\/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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Notes\" >Notes:<\/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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#3_Factors_Affecting_Cv\" >3. Factors Affecting 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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#4_Calculating_Required_Cv_for_a_System\" >4. Calculating Required Cv for a System<\/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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Example_Calculation\" >Example Calculation:<\/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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#5_Comparing_Cv_with_Other_Valve_Types\" >5. Comparing Cv with Other Valve Types<\/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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Key_Takeaway\" >Key Takeaway:<\/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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#6_Industry_Standards_for_Cv_Testing\" >6. Industry Standards for Cv Testing<\/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\/de\/2025\/07\/cv-flow-coefficients-of-gate-valves\/#Conclusion\" >Abschluss<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"Cv_Flow_Coefficients_of_Gate_Valves\"><\/span><strong>Cv Flow Coefficients of Gate Valves<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p class=\"ds-markdown-paragraph\">Der\u00a0<strong>Cv (Flow Coefficient)<\/strong>\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.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"1_Definition_of_Cv\"><\/span><strong>1. Definition of Cv<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Der\u00a0<strong>Cv value<\/strong>\u00a0is defined as:<\/p>\n<blockquote>\n<p class=\"ds-markdown-paragraph\"><strong>The number of US gallons per minute (GPM) of water at 60\u00b0F that will pass through a fully open valve with a pressure drop of 1 psi.<\/strong><\/p>\n<\/blockquote>\n<h3><span class=\"ez-toc-section\" id=\"Formula\"><\/span><strong>Formula:<\/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\">Where:<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Q<\/strong>\u00a0= Flow rate (GPM)<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>SG<\/strong>\u00a0= Specific gravity of the fluid (1 for water)<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>\u0394P<\/strong>\u00a0= Pressure drop (psi)<\/p>\n<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"2_Typical_Cv_Values_for_Gate_Valves\"><\/span><strong>2. Typical Cv Values for Gate Valves<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Gate valves have high\u00a0<strong>Cv values<\/strong>\u00a0because they offer minimal flow restriction when fully open. Below are approximate\u00a0<strong>Cv ranges<\/strong>\u00a0for different sizes:<\/p>\n<div class=\"markdown-table-wrapper\">\n<table>\n<thead>\n<tr>\n<th><strong>Valve Size (inches)<\/strong><\/th>\n<th><strong>Cv (Full Port)<\/strong><\/th>\n<th><strong>Cv (Standard Port)<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u00bd&#8221;<\/td>\n<td>15 &#8211; 20<\/td>\n<td>10 &#8211; 15<\/td>\n<\/tr>\n<tr>\n<td>1&#8243;<\/td>\n<td>35 &#8211; 50<\/td>\n<td>25 &#8211; 35<\/td>\n<\/tr>\n<tr>\n<td>2&#8243;<\/td>\n<td>120 &#8211; 150<\/td>\n<td>80 &#8211; 100<\/td>\n<\/tr>\n<tr>\n<td>4&#8243;<\/td>\n<td>450 &#8211; 600<\/td>\n<td>300 &#8211; 400<\/td>\n<\/tr>\n<tr>\n<td>6&#8243;<\/td>\n<td>900 &#8211; 1,200<\/td>\n<td>600 &#8211; 800<\/td>\n<\/tr>\n<tr>\n<td>8&#8243;<\/td>\n<td>1,600 &#8211; 2,000<\/td>\n<td>1,000 &#8211; 1,400<\/td>\n<\/tr>\n<tr>\n<td>10&#8243;<\/td>\n<td>2,500 &#8211; 3,200<\/td>\n<td>1,600 &#8211; 2,200<\/td>\n<\/tr>\n<tr>\n<td>12&#8243;<\/td>\n<td>3,600 &#8211; 4,500<\/td>\n<td>2,400 &#8211; 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>Gr\u00f6\u00dfe<\/th>\n<th>Gr\u00f6\u00dfe<\/th>\n<th colspan=\"3\">Class 150<\/th>\n<th colspan=\"3\">Class 300<\/th>\n<th colspan=\"3\">Class 600<\/th>\n<th colspan=\"3\">Class 900<\/th>\n<th colspan=\"3\">Class 1500<\/th>\n<th colspan=\"3\">Class 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>Australian Pipeline Valve<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Australian Pipeline Valve<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Australian Pipeline Valve<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Australian Pipeline Valve<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Australian Pipeline Valve<\/td>\n<td>Velan<\/td>\n<td>Ringo Valvulas<\/td>\n<td>Australian Pipeline Valve<\/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>&#8211;<\/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>&#8211;<\/td>\n<td>495<\/td>\n<td>420<\/td>\n<td>&#8211;<\/td>\n<td>495<\/td>\n<td>420<\/td>\n<td>&#8211;<\/td>\n<td>495<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>397<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>397<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/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>&#8211;<\/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>&#8211;<\/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>&#8211;<\/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>&#8211;<\/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>&#8211;<\/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>&#8211;<\/td>\n<td>9980<\/td>\n<td>9657<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>12000<\/td>\n<td>11701<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>15675<\/td>\n<td>15447<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>23910<\/td>\n<td>23056<\/td>\n<td>&#8211;<\/td>\n<td>20640<\/td>\n<td>19766<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>29550<\/td>\n<td>28726<\/td>\n<td>&#8211;<\/td>\n<td>25880<\/td>\n<td>25022<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>42570<\/td>\n<td>42027<\/td>\n<td>&#8211;<\/td>\n<td>31175<\/td>\n<td>36507<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>52167<\/td>\n<td>49668<\/td>\n<td>&#8211;<\/td>\n<td>45514<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>60500<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>53320<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>69452<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>61095<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>32<\/td>\n<td>800<\/td>\n<td>81000<\/td>\n<td>103000<\/td>\n<td>&#8211;<\/td>\n<td>81000<\/td>\n<td>100580<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>85180<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>79092<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>73478<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>34<\/td>\n<td>850<\/td>\n<td>92500<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>82500<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>103212<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>96862<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>38<\/td>\n<td>950<\/td>\n<td>11500<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>103000<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>40<\/td>\n<td>1000<\/td>\n<td>130000<\/td>\n<td>175860<\/td>\n<td>&#8211;<\/td>\n<td>129500<\/td>\n<td>171740<\/td>\n<td>&#8211;<\/td>\n<td>115000<\/td>\n<td>156127<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>197272<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>44<\/td>\n<td>1100<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>144000<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>46<\/td>\n<td>1150<\/td>\n<td>171000<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/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>&#8211;<\/td>\n<td>326000<\/td>\n<td>215888<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>50<\/td>\n<td>1250<\/td>\n<td>198000<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>190000<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>54<\/td>\n<td>1350<\/td>\n<td>238000<\/td>\n<td>&#8211;<\/td>\n<td>278938<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>278938<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>56<\/td>\n<td>1400<\/td>\n<td>260000<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>60<\/td>\n<td>1500<\/td>\n<td>300000<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>64<\/td>\n<td>1600<\/td>\n<td>340000<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Notes\"><\/span><strong>Notes:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Full port (full bore) gate valves<\/strong>\u00a0have a higher\u00a0<strong>Cv<\/strong>\u00a0because their bore matches the pipe ID.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Standard (reduced) port gate valves<\/strong>\u00a0have a slightly smaller bore, reducing\u00a0<strong>Cv<\/strong>\u00a0by ~20-30%.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Cv increases with valve size<\/strong>\u00a0due to larger flow area.<\/p>\n<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"3_Factors_Affecting_Cv\"><\/span><strong>3. Factors Affecting Cv<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol start=\"1\">\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Valve Design<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Full port vs. standard port<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Wedge type (solid, flexible, split)<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Flow Conditions<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Turbulent vs. laminar flow<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Viscosity effects (higher viscosity reduces Cv)<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Pressure Drop (\u0394P)<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Higher \u0394P increases flow rate but may cause cavitation.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Fluid Properties<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Specific gravity (SG) and temperature affect 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. Calculating Required Cv for a System<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">To select the right valve size, engineers calculate the required\u00a0<strong>Cv<\/strong>\u00a0based on system conditions:<\/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>Example Calculation:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Flow rate (Q):<\/strong>\u00a0100 GPM<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Pressure drop (\u0394P):<\/strong>\u00a05 psi<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Specific gravity (SG):<\/strong>\u00a01 (water)<\/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\">A\u00a0<strong>2&#8243; full-port gate valve (Cv \u2248 120-150)<\/strong>\u00a0would be more than sufficient.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"5_Comparing_Cv_with_Other_Valve_Types\"><\/span><strong>5. Comparing Cv with Other Valve Types<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"markdown-table-wrapper\">\n<table>\n<thead>\n<tr>\n<th><strong>Ventiltyp<\/strong><\/th>\n<th><strong>Typical Cv (2&#8243; Valve)<\/strong><\/th>\n<th><strong>Flow Efficiency<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Absperrschieber<\/strong><\/td>\n<td>120 &#8211; 150 (full port)<\/td>\n<td>Very High<\/td>\n<\/tr>\n<tr>\n<td><strong>Kugelhahn<\/strong><\/td>\n<td>150 &#8211; 200 (full port)<\/td>\n<td>Hoch<\/td>\n<\/tr>\n<tr>\n<td><strong>Absperrventil<\/strong><\/td>\n<td>30 &#8211; 50<\/td>\n<td>Moderate<\/td>\n<\/tr>\n<tr>\n<td><strong>Absperrklappe<\/strong><\/td>\n<td>80 &#8211; 120<\/td>\n<td>Hoch<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Key_Takeaway\"><\/span><strong>Key Takeaway:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Gate valves have excellent flow capacity (high Cv)<\/strong>\u00a0but are not ideal for throttling.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Ball and butterfly valves<\/strong>\u00a0may have slightly higher\u00a0<strong>Cv<\/strong>\u00a0but serve different purposes.<\/p>\n<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"6_Industry_Standards_for_Cv_Testing\"><\/span><strong>6. Industry Standards for Cv Testing<\/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 Standard for control valve flow coefficients.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ISA-75.01.01<\/strong>\u00a0\u2013 Flow equations for sizing control valves (sometimes referenced for manual valves).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ISO 5208<\/strong>\u00a0\u2013 Industrial valve testing (includes leakage and flow capacity checks).<\/p>\n<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Abschluss<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Der\u00a0<strong>Cv value<\/strong>\u00a0is crucial for selecting the right gate valve size to minimize pressure drop and ensure efficient flow. Full-port gate valves offer the highest\u00a0<strong>Cv<\/strong>, making them ideal for low-resistance applications.<\/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_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_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/oudianvalve.com\/de\/wp-json\/wp\/v2\/posts\/18513","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oudianvalve.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oudianvalve.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oudianvalve.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oudianvalve.com\/de\/wp-json\/wp\/v2\/comments?post=18513"}],"version-history":[{"count":2,"href":"https:\/\/oudianvalve.com\/de\/wp-json\/wp\/v2\/posts\/18513\/revisions"}],"predecessor-version":[{"id":18515,"href":"https:\/\/oudianvalve.com\/de\/wp-json\/wp\/v2\/posts\/18513\/revisions\/18515"}],"wp:attachment":[{"href":"https:\/\/oudianvalve.com\/de\/wp-json\/wp\/v2\/media?parent=18513"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oudianvalve.com\/de\/wp-json\/wp\/v2\/categories?post=18513"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oudianvalve.com\/de\/wp-json\/wp\/v2\/tags?post=18513"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}