{"id":11,"date":"2026-08-31T08:49:11","date_gmt":"2026-08-31T08:49:11","guid":{"rendered":"https:\/\/vas.co.th\/?page_id=11"},"modified":"2026-08-31T10:00:39","modified_gmt":"2026-08-31T10:00:39","slug":"how-centrifugal-pumps-work","status":"publish","type":"page","link":"https:\/\/vas.co.th\/?page_id=11","title":{"rendered":"How Centrifugal Pumps Work"},"content":{"rendered":"\n<div class=\"vas-page vas-knowledge-article\">\n<section class=\"vas-article-hero vas-section\">\n<div class=\"vas-container vas-article-shell\">\n<nav class=\"vas-breadcrumbs\" aria-label=\"Breadcrumb\"><a href=\"https:\/\/vas.co.th\/\">Home<\/a><span>\/<\/span><a href=\"https:\/\/vas.co.th\/?page_id=9\">Knowledge Center<\/a><span>\/<\/span><span aria-current=\"page\">How Centrifugal Pumps Work<\/span><\/nav>\n<p class=\"vas-eyebrow\">Water Pumps<\/p>\n<h1>How Centrifugal Pumps Work<\/h1>\n<p class=\"vas-lead\">A centrifugal pump uses a rotating impeller to add velocity to water. The casing then converts part of that velocity into usable pressure.<\/p>\n<\/div>\n<\/section>\n<section class=\"vas-section vas-section--white\">\n<div class=\"vas-container vas-article-shell\">\n<article class=\"vas-article-body\">\n<figure class=\"vas-subject-visual vas-local-technical-figure\"><figcaption>\n<p class=\"vas-eyebrow\">Operating principle<\/p>\n<h2>How a Centrifugal Pump Moves Water<\/h2>\n<\/figcaption><div class=\"vas-local-technical-figure__viewport\"><a href=\"https:\/\/vas.co.th\/wp-content\/plugins\/vas-site-prototype-plugin\/assets\/technical\/how%20a%20pump%20works%20(how%20a%20pump%20works).png\" target=\"_blank\" rel=\"noopener\" aria-label=\"Open How a Centrifugal Pump Moves Water at full size\"><img decoding=\"async\" src=\"https:\/\/vas.co.th\/wp-content\/plugins\/vas-site-prototype-plugin\/assets\/technical\/how%20a%20pump%20works%20(how%20a%20pump%20works).png\" alt=\"Labeled centrifugal-pump operating diagram showing suction, the impeller eye and impeller, the volute casing, increasing pressure, and discharge flow.\" loading=\"lazy\"><\/a><\/div>\n<p class=\"vas-photo-credit\">Typical centrifugal-pump operating principle. Actual configurations vary by pump type and application.<\/p>\n<\/figure>\n<section class=\"vas-article-lessons\" aria-labelledby=\"vas-article-lessons-title\">\n<header>\n<p class=\"vas-eyebrow\">Key takeaways<\/p>\n<h2 id=\"vas-article-lessons-title\">What to Know<\/h2>\n<p>Scan the main ideas first. Open \u201cKey points\u201d only when you want the supporting details.<\/p>\n<\/header>\n<p class=\"vas-article-lessons__hint\">Swipe the cards to continue <span aria-hidden=\"true\">\u2192<\/span><\/p>\n<div class=\"vas-article-lessons__grid\" role=\"list\" aria-label=\"Article key takeaways\">\n<article class=\"vas-article-lesson\" role=\"listitem\"><span class=\"vas-article-lesson__number\">01<\/span><\/p>\n<h3>Water Reaches the Suction Inlet<\/h3>\n<p>Before pumping can begin, the casing and suction line must contain water unless the selected pump is specifically self-priming. Atmospheric or supply pressure then moves water toward the lower-pressure region created at the impeller eye.<\/p>\n<details>\n<summary>Key points <span>3<\/span><\/summary>\n<ul>\n<li>A short, adequately sized suction line helps reduce losses<\/li>\n<li>Air leaks, blocked strainers, or insufficient inlet pressure can interrupt flow<\/li>\n<li>The available inlet pressure must remain high enough to avoid cavitation<\/li>\n<\/ul>\n<\/details>\n<\/article>\n<article class=\"vas-article-lesson\" role=\"listitem\"><span class=\"vas-article-lesson__number\">02<\/span><\/p>\n<h3>Water Enters the Impeller Eye<\/h3>\n<p>Water enters axially at the center of the rotating impeller. The eye is the low-radius entry area shown in the diagram, where the liquid begins following the rotating vanes.<\/p>\n<details>\n<summary>Key points <span>3<\/span><\/summary>\n<ul>\n<li>The impeller eye is the central inlet region of the rotating impeller<\/li>\n<li>Water should reach the eye with as little swirl and air as practical<\/li>\n<li>Restricted inlet conditions can reduce performance and increase cavitation risk<\/li>\n<\/ul>\n<\/details>\n<\/article>\n<article class=\"vas-article-lesson\" role=\"listitem\"><span class=\"vas-article-lesson__number\">03<\/span><\/p>\n<h3>The Impeller Adds Velocity and Energy<\/h3>\n<p>As the vanes rotate, they guide water outward from the eye toward the impeller perimeter. The increasing radius and blade motion raise the liquid\u2019s velocity and total energy.<\/p>\n<details>\n<summary>Key points <span>2<\/span><\/summary>\n<ul>\n<li>Impeller diameter and rotational speed strongly influence the developed head<\/li>\n<li>Vane geometry affects efficiency and the range of stable operation<\/li>\n<\/ul>\n<\/details>\n<\/article>\n<article class=\"vas-article-lesson\" role=\"listitem\"><span class=\"vas-article-lesson__number\">04<\/span><\/p>\n<h3>The Volute Converts Velocity Into Pressure<\/h3>\n<p>Water leaving the impeller enters the expanding volute passage. The growing flow area slows part of the high-velocity water and converts part of that velocity energy into static pressure.<\/p>\n<details>\n<summary>Key points <span>3<\/span><\/summary>\n<ul>\n<li>The volute collects flow around the impeller perimeter<\/li>\n<li>Its expanding passage converts part of the water\u2019s velocity into pressure<\/li>\n<li>Casing geometry and operating point influence hydraulic efficiency and internal forces<\/li>\n<\/ul>\n<\/details>\n<\/article>\n<article class=\"vas-article-lesson\" role=\"listitem\"><span class=\"vas-article-lesson__number\">05<\/span><\/p>\n<h3>Pressurized Water Leaves the Discharge<\/h3>\n<p>The collected flow exits through the discharge outlet and enters the connected pipe system. The actual operating flow occurs where the pump performance curve and the resistance of the complete system meet.<\/p>\n<details>\n<summary>Key points <span>3<\/span><\/summary>\n<ul>\n<li>A partly closed discharge valve increases system resistance and reduces flow<\/li>\n<li>A system with lower resistance generally allows more flow<\/li>\n<li>Operation should remain within the manufacturer\u2019s approved range<\/li>\n<\/ul>\n<\/details>\n<\/article>\n<\/div>\n<\/section>\n<\/article>\n<aside class=\"vas-article-next\">\n<p class=\"vas-eyebrow\">Put it into practice<\/p>\n<h2>Discuss the Right Product for Your Needs<\/h2>\n<p>Use this guide as a starting point. Final selection should be confirmed against the actual system conditions and manufacturer specifications.<\/p>\n<div class=\"vas-actions\"><a class=\"vas-button\" href=\"https:\/\/vas.co.th\/?page_id=22\">Contact Us<\/a><a class=\"vas-button vas-button--secondary\" href=\"https:\/\/vas.co.th\/?page_id=7\">View Water Pumps<\/a><\/div>\n<p><a class=\"vas-text-link\" href=\"https:\/\/vas.co.th\/?page_id=9\">Back to the Knowledge Center <span class=\"vas-icon vas-icon--arrow-right \" aria-hidden=\"true\"><\/span><\/a><\/aside>\n<\/div>\n<\/section><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Home\/Knowledge Center\/How Centrifugal Pumps Work Water Pumps How Centrifugal Pumps Work A centrifugal pump uses a rotating impeller to add velocity to water. The casing then converts part of that velocity into usable pressure. Operating principle How a Centrifugal Pump Moves Water Typical centrifugal-pump operating principle. Actual configurations vary by pump type and application. Key&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":9,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"hide","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"hide","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-11","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/pages\/11","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vas.co.th\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=11"}],"version-history":[{"count":1,"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/pages\/11\/revisions"}],"predecessor-version":[{"id":35,"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/pages\/11\/revisions\/35"}],"up":[{"embeddable":true,"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/pages\/9"}],"wp:attachment":[{"href":"https:\/\/vas.co.th\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}