{"id":100134,"date":"2026-02-15T20:19:35","date_gmt":"2026-02-15T20:19:35","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100134"},"modified":"2026-04-05T15:42:15","modified_gmt":"2026-04-05T15:42:15","slug":"hydraulic-valve-cetop-iso4401","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bn\/calculators\/hydraulic-valve-cetop-iso4401\/","title":{"rendered":"CETOP Valve Sizing &#038; Flow Kv Calculator | Free Tool"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Hydraulic Valve CETOP Sizing Calculator\",\"description\":\"CETOP\/ISO 4401 valve sizing with flow capacity, pressure drop, and power loss calculation.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/hydraulic-valve-cetop-iso4401\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2024-01-01\",\"dateModified\":\"2026-02-15\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"What is CETOP?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"CETOP (Comit\u00e9 Europ\u00e9en des Transmissions Ol\u00e9ohydrauliques et Pneumatiques) defines standard valve mounting interfaces. Now standardized as ISO 4401. CETOP sizes: 03=NG6, 05=NG10, 07=NG16, 08=NG25, 10=NG32.\"}},\n{\"@type\":\"Question\",\"name\":\"How to calculate flow through a hydraulic valve?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Q = Kv \u00d7 \u221a(\u0394P\/SG) where Q is flow in L\/min, Kv is flow coefficient, \u0394P is pressure drop in bar, and SG is specific gravity (0.86-0.90 for hydraulic oil). Kv values are published by valve manufacturers.\"}},\n{\"@type\":\"Question\",\"name\":\"How is power loss calculated?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Power loss P_loss = Q \u00d7 \u0394P \/ 600 (kW), where Q is flow in L\/min and \u0394P is pressure drop in bar. This heat must be dissipated by the hydraulic oil cooler.\"}},\n{\"@type\":\"Question\",\"name\":\"How to select the right CETOP valve size?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Size based on required flow rate: CETOP 03 (NG6) for 40-80 L\/min, CETOP 05 (NG10) for 80-120, CETOP 07 (NG16) for 120-350, CETOP 08 (NG25) for 350-600, CETOP 10 (NG32) for 600-1000 L\/min. Oversizing wastes space; undersizing causes excessive pressure drop and heat.\"}},\n{\"@type\":\"Question\",\"name\":\"What pressure rating do CETOP valves have?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most CETOP directional valves are rated 315 bar (4600 psi). Some high-performance CETOP 03\/05 go to 350 bar. Always verify the specific valve's pressure rating.\"}}\n]}\n<\/script>\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&#038;family=JetBrains+Mono:wght@400;500;600&#038;family=Fraunces:opsz,wght@9..144,700;9..144,800&#038;display=swap\" rel=\"stylesheet\">\n\n<link rel=\"stylesheet\" href=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.css\">\n\n<style>\n:root { 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20px;font-size:13px;font-weight:700;color:#fff;background:var(--vc-accent);border-radius:var(--vc-radius);text-decoration:none;transition:background .15s}.vc-promo-link:hover{background:var(--vc-accent-hover)}\n.vc-footer{text-align:center;padding:32px 16px;font-size:13px;color:var(--vc-ink-muted)}.vc-footer a{color:var(--vc-accent);text-decoration:none}.vc-footer-links{margin-top:8px;font-size:12px}.vc-footer-links a{margin:0 8px}\n@media print{.vc-section-body{max-height:none!important}.vc-faq-a{max-height:none!important}.vc-results{max-height:none!important;padding:24px!important}.vc-copy-btn,.vc-section-chevron,.vc-faq-chevron,.vc-presets,.vc-promo{display:none!important}}\n<\/style>\n\n<div class=\"vc-calculator\" id=\"vc-cetop\">\n\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p>\n    <h1 class=\"vc-header-title\">Hydraulic Valve CETOP Sizing &amp; Flow Calculator<\/h1>\n    <p class=\"vc-header-subtitle\">Size CETOP\/ISO 4401 valves based on flow rate and pressure drop. Calculate flow capacity (Kv), power loss, and recommended valve size.<\/p>\n    <div class=\"vc-badges\"><span class=\"vc-badge\">ISO 4401<\/span><span class=\"vc-badge\">CETOP 03\u201310<\/span><span class=\"vc-badge\">Flow Kv<\/span><\/div>\n<\/header>\n\n<div class=\"vc-card\">\n    <form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\">\n        <div class=\"vc-form-grid\">\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-flow\">System Flow Rate <span class=\"vc-label-hint\">(L\/min)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-flow\" step=\"any\" min=\"1\" value=\"60\" placeholder=\"e.g. 60\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-dp\">Pressure Drop \u0394P <span class=\"vc-label-hint\">(bar)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-dp\" step=\"any\" min=\"0.1\" value=\"5\" placeholder=\"e.g. 5\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-sg\">Oil Specific Gravity <span class=\"vc-label-hint\">(SG)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-sg\" step=\"any\" min=\"0.5\" max=\"1.5\" value=\"0.87\" placeholder=\"e.g. 0.87\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-cetop\">CETOP Size (manual select)<\/label>\n                <select class=\"vc-select\" id=\"vc-cetop\"><option value=\"auto\" selected>Auto (recommend)<\/option><option value=\"03\">CETOP 03 (NG6)<\/option><option value=\"05\">CETOP 05 (NG10)<\/option><option value=\"07\">CETOP 07 (NG16)<\/option><option value=\"08\">CETOP 08 (NG25)<\/option><option value=\"10\">CETOP 10 (NG32)<\/option><\/select>\n            <\/div>\n        <\/div>\n        <div class=\"vc-presets\"><div class=\"vc-presets-label\">Quick presets<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-q=\"30\" data-dp=\"5\" data-sg=\"0.87\">Small system 30 L\/min<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-q=\"80\" data-dp=\"8\" data-sg=\"0.87\">Medium 80 L\/min<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-q=\"200\" data-dp=\"10\" data-sg=\"0.87\">Large 200 L\/min<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-q=\"500\" data-dp=\"6\" data-sg=\"0.87\">Heavy 500 L\/min<\/button>\n        <\/div>\n    <\/form>\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Results<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\"><svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy<\/button><\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Recommended CETOP Size<\/div><div class=\"vc-rcard-value\" id=\"vc-r-size\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Required Kv<\/div><div class=\"vc-rcard-value\" id=\"vc-r-kv\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Power Loss through Valve<\/div><div class=\"vc-rcard-value\" id=\"vc-r-ploss\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Heat Generation<\/div><div class=\"vc-rcard-value\" id=\"vc-r-heat\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Mounting Dimensions<\/div><div class=\"vc-rcard-value\" id=\"vc-r-mount\" style=\"font-size:14px\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Port Sizes<\/div><div class=\"vc-rcard-value\" id=\"vc-r-ports\" style=\"font-size:16px\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Bolt Pattern<\/div><div class=\"vc-rcard-value\" id=\"vc-r-bolts\" style=\"font-size:16px\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Velocity in Ports<\/div><div class=\"vc-rcard-value\" id=\"vc-r-vel\">\u2014<\/div><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<div class=\"vc-section vc-open\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Theory &amp; Formulas<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\n        <h3>Flow Capacity (Kv)<\/h3>\n        <div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div>\n        <h3>Power Loss<\/h3>\n        <div class=\"vc-formula-box\" id=\"vc-katex-2\"><\/div>\n        <h3>CETOP Size Reference<\/h3>\n        <table class=\"vc-table\"><thead><tr><th>CETOP<\/th><th>NG<\/th><th>P,T Ports<\/th><th>A,B Ports<\/th><th>Bolts<\/th><th>Face (mm)<\/th><th>Typical Kv<\/th><th>Flow (L\/min)<\/th><\/tr><\/thead><tbody>\n        <tr><td>03<\/td><td>NG6<\/td><td>G3\/8<\/td><td>G3\/8<\/td><td>4\u00d7M5<\/td><td>69.9\u00d736.5<\/td><td>8\u201312<\/td><td>40\u201380<\/td><\/tr>\n        <tr><td>05<\/td><td>NG10<\/td><td>G1\/2<\/td><td>G1\/2<\/td><td>4\u00d7M6<\/td><td>102.4\u00d756.4<\/td><td>15\u201325<\/td><td>80\u2013120<\/td><\/tr>\n        <tr><td>07<\/td><td>NG16<\/td><td>G3\/4<\/td><td>G3\/4<\/td><td>4\u00d7M8<\/td><td>152\u00d780<\/td><td>30\u201350<\/td><td>120\u2013350<\/td><\/tr>\n        <tr><td>08<\/td><td>NG25<\/td><td>G1<\/td><td>G1<\/td><td>4\u00d7M10<\/td><td>197\u00d7102<\/td><td>55\u201380<\/td><td>350\u2013600<\/td><\/tr>\n        <tr><td>10<\/td><td>NG32<\/td><td>G1-1\/4<\/td><td>G1-1\/4<\/td><td>4\u00d7M12<\/td><td>255\u00d7130<\/td><td>90\u2013120<\/td><td>600\u20131000<\/td><\/tr><\/tbody><\/table>\n        <h3>Practical Example<\/h3>\n        <div class=\"vc-example-box\"><div class=\"vc-example-title\">Example \u2014 Select valve for 80 L\/min, \u0394P=8 bar<\/div>\n        <p>Required Kv = 80 \/ \u221a(8\/0.87) = 80 \/ 3.03 = <strong>26.4<\/strong><\/p>\n        <p>CETOP 05 has typical Kv = 15\u201325 \u2192 borderline \u2192 <strong>CETOP 07 (NG16)<\/strong> recommended<\/p>\n        <p>Power loss = 80 \u00d7 8 \/ 600 = <strong>1.07 kW<\/strong><\/p><\/div>\n    <\/div><\/div>\n<\/div>\n\n<div class=\"vc-section\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udd17<\/span><span class=\"vc-section-title\">Related Calculators<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\"><a class=\"vc-related-link\" href=\"\/calculators\/hydraulic-cylinder-calculator\/\">Hydraulic Cylinder<\/a><a class=\"vc-related-link\" href=\"\/calculators\/hydraulic-oil-cleanliness-iso4406\/\">Oil Cleanliness<\/a><a class=\"vc-related-link\" href=\"\/calculators\/valve-flow-coefficient\/\">Valve Kv\/Cv<\/a><\/div><\/div><\/div><\/div>\n\n<div class=\"vc-section\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\u2753<\/span><span class=\"vc-section-title\">Frequently Asked Questions<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div><\/div>\n\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>Professional instruments. Used in 50+ countries.<\/div><a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div>\n<footer class=\"vc-footer\"><p>&copy; 2024&ndash;2026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><div class=\"vc-footer-links\"><a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a><a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a><\/div><\/footer>\n<\/div>\n\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.js\"><\/script>\n<script>\n(function() {\n    'use strict';\n    var SLUG = 'hydraulic-valve-cetop-iso4401';\n    function $(id) { return document.getElementById(id); }\n    function fmt(n, d) { if (isNaN(n) || !isFinite(n)) return '\u2014'; return n.toFixed(d === undefined ? 2 : d).replace(\/(\\.\\d*?)0+$\/, '$1').replace(\/\\.$\/, ''); }\n\n    var CETOP_DATA = {\n        '03': { ng: 'NG6', pt: 'G3\/8 (BSP)', ab: 'G3\/8 (BSP)', bolt: '4\u00d7M5, 36\u00d726 PCD', face: '69.9\u00d736.5 mm', kvMin: 8, kvMax: 12, qMin: 40, qMax: 80, portDia: 10 },\n        '05': { ng: 'NG10', pt: 'G1\/2 (BSP)', ab: 'G1\/2 (BSP)', bolt: '4\u00d7M6, 53\u00d744 PCD', face: '102.4\u00d756.4 mm', kvMin: 15, kvMax: 25, qMin: 80, qMax: 120, portDia: 13 },\n        '07': { ng: 'NG16', pt: 'G3\/4 (BSP)', ab: 'G3\/4 (BSP)', bolt: '4\u00d7M8, 88\u00d763 PCD', face: '152\u00d780 mm', kvMin: 30, kvMax: 50, qMin: 120, qMax: 350, portDia: 20 },\n        '08': { ng: 'NG25', pt: 'G1 (BSP)', ab: 'G1 (BSP)', bolt: '4\u00d7M10, 117\u00d782 PCD', face: '197\u00d7102 mm', kvMin: 55, kvMax: 80, qMin: 350, qMax: 600, portDia: 25 },\n        '10': { ng: 'NG32', pt: 'G1-1\/4 (BSP)', ab: 'G1-1\/4 (BSP)', bolt: '4\u00d7M12, 152\u00d7102 PCD', face: '255\u00d7130 mm', kvMin: 90, kvMax: 120, qMin: 600, qMax: 1000, portDia: 32 }\n    };\n    var CETOP_ORDER = ['03', '05', '07', '08', '10'];\n\n    function recommendCetop(q) {\n        for (var i = 0; i < CETOP_ORDER.length; i++) {\n            var d = CETOP_DATA[CETOP_ORDER[i]];\n            if (q <= d.qMax) return CETOP_ORDER[i];\n        }\n        return '10';\n    }\n\n    function calculate() {\n        var Q = parseFloat($('vc-flow').value);\n        var dp = parseFloat($('vc-dp').value);\n        var sg = parseFloat($('vc-sg').value);\n        var manualCetop = $('vc-cetop').value;\n\n        if (!Q || Q <= 0 || !dp || dp <= 0 || !sg || sg <= 0) { $('vc-results').classList.remove('vc-visible'); return; }\n\n        \/* Required Kv: Q = Kv \u00d7 \u221a(\u0394P\/SG) \u2192 Kv = Q \/ \u221a(\u0394P\/SG) *\/\n        var kvRequired = Q \/ Math.sqrt(dp \/ sg);\n\n        \/* Recommend CETOP size *\/\n        var cetop = (manualCetop === 'auto') ? recommendCetop(Q) : manualCetop;\n        var d = CETOP_DATA[cetop];\n\n        \/* Power loss: P = Q \u00d7 \u0394P \/ 600 (kW) *\/\n        var pLoss = Q * dp \/ 600;\n\n        \/* Heat in kcal\/h: 1 kW = 860 kcal\/h *\/\n        var heatKcal = pLoss * 860;\n\n        \/* Port velocity: v = Q\/(A \u00d7 60000) where A = \u03c0\/4 \u00d7 d\u00b2 in mm\u00b2, Q in L\/min \u2192 v in m\/s *\/\n        var portArea = Math.PI \/ 4 * d.portDia * d.portDia; \/* mm\u00b2 *\/\n        var portVel = (Q * 1e6) \/ (portArea * 60000); \/* mm\/s \u2192 m\/s? Let me recalc *\/\n        \/* Q L\/min = Q\/60 L\/s = Q\/60 \u00d7 1e-3 m\u00b3\/s = Q \u00d7 1e-3\/60 m\u00b3\/s *\/\n        \/* A = \u03c0\/4 \u00d7 (d\/1000)\u00b2 m\u00b2 *\/\n        var A_m2 = Math.PI \/ 4 * Math.pow(d.portDia \/ 1000, 2);\n        var Q_m3s = Q \/ 60000;\n        portVel = Q_m3s \/ A_m2;\n\n        $('vc-r-size').innerHTML = 'CETOP ' + cetop + ' <span class=\"vc-rcard-unit\">(' + d.ng + ')<\/span>';\n        $('vc-r-kv').innerHTML = fmt(kvRequired, 1) + ' <span class=\"vc-rcard-unit\">(valve range: ' + d.kvMin + '\u2013' + d.kvMax + ')<\/span>';\n        $('vc-r-ploss').innerHTML = fmt(pLoss, 2) + ' <span class=\"vc-rcard-unit\">kW<\/span>';\n        $('vc-r-heat').innerHTML = fmt(heatKcal, 0) + ' <span class=\"vc-rcard-unit\">kcal\/h<\/span>';\n        $('vc-r-mount').innerHTML = 'Face: ' + d.face + '<br>Max flow: ' + d.qMin + '\u2013' + d.qMax + ' L\/min';\n        $('vc-r-ports').innerHTML = 'P,T: ' + d.pt + '<br>A,B: ' + d.ab;\n        $('vc-r-bolts').innerHTML = d.bolt;\n        $('vc-r-vel').innerHTML = fmt(portVel, 1) + ' <span class=\"vc-rcard-unit\">m\/s<\/span> <span class=\"vc-rcard-unit\">(' + (portVel > 6 ? '\u26a0 high!' : '\u2713 OK') + ')<\/span>';\n\n        $('vc-results').classList.add('vc-visible');\n\n        var u = new URL(window.location); u.searchParams.set('flow', Q); u.searchParams.set('dp', dp); u.searchParams.set('sg', sg);\n        history.replaceState(null, '', u.toString());\n        saveHistory({ flow: Q, dp: dp, cetop: cetop, _summary: 'Q=' + Q + ' L\/min, CETOP ' + cetop });\n    }\n\n    $('vc-form').addEventListener('input', calculate);\n    $('vc-form').addEventListener('change', calculate);\n\n    document.querySelectorAll('.vc-preset-btn').forEach(function(btn) {\n        btn.addEventListener('click', function(e) { e.preventDefault(); $('vc-flow').value = this.getAttribute('data-q'); $('vc-dp').value = this.getAttribute('data-dp'); $('vc-sg').value = this.getAttribute('data-sg'); $('vc-cetop').value = 'auto'; calculate(); });\n    });\n\n    $('vc-copy-btn').addEventListener('click', function() {\n        var text = 'CETOP Valve Sizing\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nFlow: ' + $('vc-flow').value + ' L\/min\\n\u0394P: ' + $('vc-dp').value + ' bar\\nRecommended: ' + $('vc-r-size').textContent + '\\nKv: ' + $('vc-r-kv').textContent + '\\nPower Loss: ' + $('vc-r-ploss').textContent + '\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nvibromera.eu';\n        if (navigator.clipboard) { navigator.clipboard.writeText(text).then(function() { var b = $('vc-copy-btn'); b.classList.add('vc-copied'); b.innerHTML = '<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><polyline points=\"20 6 9 17 4 12\"\/><\/svg> Copied!'; setTimeout(function() { b.classList.remove('vc-copied'); b.innerHTML = '<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy'; }, 2000); }); }\n    });\n\n    document.querySelectorAll('.vc-section-toggle').forEach(function(btn) { btn.addEventListener('click', function() { var s = this.closest('.vc-section'); s.classList.toggle('vc-open'); this.setAttribute('aria-expanded', s.classList.contains('vc-open')); }); });\n\n    var faqData = [\n        { q: 'What is CETOP?', a: '<p>CETOP defines standard valve mounting interfaces per ISO 4401. Sizes: 03=NG6, 05=NG10, 07=NG16, 08=NG25, 10=NG32. Same size valves from any manufacturer fit the same sub-plate.<\/p>' },\n        { q: 'How to calculate flow through a valve?', a: '<p>Q = Kv \u00d7 \u221a(\u0394P\/SG). Kv is the flow coefficient \u2014 it represents the flow in L\/min that produces 1 bar pressure drop with water (SG=1). For hydraulic oil (SG\u22480.87), capacity is slightly higher.<\/p>' },\n        { q: 'How is power loss calculated?', a: '<p>P_loss = Q \u00d7 \u0394P \/ 600 (kW). This is the energy converted to heat as fluid passes through the valve. This heat must be removed by the oil cooler. Excessive \u0394P = excess heat = need for larger cooler.<\/p>' },\n        { q: 'What port velocity is acceptable?', a: '<p>Pressure lines: max 4\u20136 m\/s. Return lines: max 2\u20133 m\/s. Suction lines: max 1\u20131.5 m\/s. Higher velocity = more noise, turbulence, and pressure drop.<\/p>' },\n        { q: 'Pressure rating of CETOP valves?', a: '<p>Standard: 315 bar (4600 psi). High-performance: up to 350 bar. Always verify the specific valve datasheet for actual ratings.<\/p>' }\n    ];\n    var fl = $('vc-faq-list'); faqData.forEach(function(f) { fl.innerHTML += '<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>' + f.q + '<\/span><svg class=\"vc-faq-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\">' + f.a + '<\/div><\/div><\/div>'; });\n    fl.addEventListener('click', function(e) { var b = e.target.closest('.vc-faq-q'); if (b) b.closest('.vc-faq-item').classList.toggle('vc-open'); });\n\n    function saveHistory(entry) { var key = 'vc_history_' + SLUG; var arr = []; try { arr = JSON.parse(localStorage.getItem(key)) || []; } catch(e) {} entry._ts = new Date().toISOString(); arr.unshift(entry); if (arr.length > 10) arr = arr.slice(0, 10); try { localStorage.setItem(key, JSON.stringify(arr)); } catch(e) {} }\n\n    function renderFormulas() {\n        try {\n            katex.render('Q = K_v \\\\times \\\\sqrt{\\\\frac{\\\\Delta P}{SG}} \\\\quad [\\\\text{L\/min}] \\\\qquad K_v = \\\\frac{Q}{\\\\sqrt{\\\\Delta P \/ SG}}', $('vc-katex-1'), { displayMode: true, throwOnError: false });\n            katex.render('P_{\\\\text{loss}} = \\\\frac{Q \\\\times \\\\Delta P}{600} \\\\quad [\\\\text{kW}]', $('vc-katex-2'), { displayMode: true, throwOnError: false });\n        } catch(e) {}\n    }\n\n    function init() {\n        var p = new URLSearchParams(window.location.search);\n        if (p.get('flow')) $('vc-flow').value = p.get('flow');\n        if (p.get('dp')) $('vc-dp').value = p.get('dp');\n        if (p.get('sg')) $('vc-sg').value = p.get('sg');\n        renderFormulas(); calculate();\n    }\n    if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', init); } else { init(); }\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Free CETOP\/ISO 4401 hydraulic valve sizing calculator. Calculate flow capacity from Kv, pressure drop, power loss, and get valve size recommendation.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100134","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100134","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100134\/revisions"}],"predecessor-version":[{"id":100949,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100134\/revisions\/100949"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/media?parent=100134"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/categories?post=100134"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/tags?post=100134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}