{"id":3523,"date":"2022-07-18T13:34:41","date_gmt":"2022-07-18T18:34:41","guid":{"rendered":"https:\/\/www.bioblend.com\/?page_id=3523"},"modified":"2025-06-11T11:31:25","modified_gmt":"2025-06-11T16:31:25","slug":"what-causes-hydraulic-fluid-to-foam","status":"publish","type":"page","link":"https:\/\/www.bioblend.com\/fr\/what-causes-hydraulic-fluid-to-foam\/","title":{"rendered":"Qu&#039;est-ce qui fait mousser le liquide hydraulique"},"content":{"rendered":"<div class=\"flex max-w-full flex-col flex-grow AIPRM__conversation__response\">\n<div class=\"min-h-8 text-message flex w-full flex-col items-end gap-2 whitespace-normal break-words text-start [.text-message+&amp;]:mt-5\" dir=\"auto\" data-message-author-role=\"assistant\" data-message-id=\"d2c2ce35-040b-41d6-b138-6644024625b7\" data-message-model-slug=\"gpt-4o\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[3px]\">\n<div class=\"markdown prose w-full break-words dark:prose-invert dark\">\n<p>Foaming in hydraulic fluid is more than a minor inconvenience\u2014it can significantly impact your system&#8217;s performance and longevity. At <a href=\"https:\/\/www.bioblend.com\/\"><strong>BioBlend<\/strong><\/a>, we specialize in providing advanced hydraulic fluids like <a href=\"https:\/\/www.bioblend.com\/product\/bioflo-aw\/\" target=\"_new\" rel=\"noopener\">BioFlo AW<\/a> and <a href=\"https:\/\/www.bioblend.com\/product\/bioflo-synthetic-aw\/\" target=\"_new\" rel=\"noopener\">BioFlo Synthetic AW<\/a> that are engineered to minimize foam formation and air contamination. Explore our <a href=\"https:\/\/www.bioblend.com\/products\/\" target=\"_new\" rel=\"noopener\">products<\/a> to find the perfect solution for your system and safeguard your equipment from unnecessary wear and tear.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3528\" src=\"https:\/\/www.bioblend.com\/wp-content\/uploads\/What-Causes-Hydraulic-Fluid-to-Foam.jpg\" alt=\"hydraulic fluid foaming in a hydraulic machine\" width=\"1920\" height=\"1282\" srcset=\"https:\/\/www.bioblend.com\/wp-content\/uploads\/What-Causes-Hydraulic-Fluid-to-Foam.jpg 1920w, https:\/\/www.bioblend.com\/wp-content\/uploads\/What-Causes-Hydraulic-Fluid-to-Foam-1280x855.jpg 1280w, https:\/\/www.bioblend.com\/wp-content\/uploads\/What-Causes-Hydraulic-Fluid-to-Foam-980x654.jpg 980w, https:\/\/www.bioblend.com\/wp-content\/uploads\/What-Causes-Hydraulic-Fluid-to-Foam-480x321.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) and (max-width: 1280px) 1280px, (min-width: 1281px) 1920px, 100vw\" \/><\/p>\n<p><span style=\"font-weight: 400;\">If you ignore it, it can cause issues with your final drive motor if you don&#8217;t fix it. Foaming is a common problem, but there are a few simple solutions.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Air bubbles in hydraulic fluid with a diameter more significant than one millimeter (roughly the thickness of an ID or credit card) are known as foam. Air from a free surface is commonly combined with hydraulic fluid. Air bubbles arise when air is trapped in a liquid. Foam is formed as the bubbles rise to the surface of the <a href=\"https:\/\/www.bioblend.com\/product-category\/hydraulic-circulating-oil\/\">hydraulic fluid<\/a>.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Hydraulic Fluid Foaming Issues<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">However minor, foaming has the potential to cause the following:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Overflowing reservoir<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Compromised ability to lubricate<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Premature aging of hydraulic fluid due to oxidation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inhaled air<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">It can lead to cavitation and pitting damage if foaming causes your hydraulic fluid to contain entrained air. Lubrication and cavitation problems are the most critical for your final drive.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>How Hydraulic Fluid Bubbles Form<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Hydraulics &amp; Pneumatics explains how air entrainment occurs:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">As pressure decreases, dissolved air is released (e.g., orifices, valves, and where the hydraulic fluid returns to the reservoir)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hydraulic system failure due to improper system bleeding.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A vacuum created by leaks (i.e., suction line)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Surface-active compound contamination<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Contamination prevents antifoam or air release chemicals from doing their work due to precipitation.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">As the fluid is being introduced to the system, it will splash.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">Hydraulic reservoirs that aren&#8217;t adequately designed<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Let\u2019s now discuss the most plausible locations for forming these bubbles. Drops in system pressure can be problematic just about anywhere. Throttles and orifices can have pressure dips significant enough to cause the formation of bubbles. It might be very hazardous when a valve is suddenly opened at the end of a pipe. Bubbles can also occur near pipe connections and branches. Shockwaves can cause bubbles to appear when a pump suddenly stops working.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>What Leads to Hydraulic Oil Foaming?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">If your hydraulic fluid foams according to Causes and Solutions for Foaming in Oil, there are several reasons for this. These are a few examples:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Water, sediments, or grease contamination is possible.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Contamination by the incorrect fluid type<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hydraulic fluid aeration is excessive (which is usually a mechanical issue)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A decrease in the efficiency of the pump<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Defoamant can still form even if you&#8217;ve previously been using it, if you&#8217;re using too much or if it&#8217;s depleted.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><b>Engineers in Hydraulics Design Systems to Prevent Foaming<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Engineers will take steps to prevent foam from forming while constructing a hydraulic system. Baffles in the reservoir, for example, prevent fluid from the return line from flowing directly into the pump. Around the reservoir are breather filter covers as well. As fluid is pumped in and out of the reservoir, these devices are critical in maintaining the reservoir&#8217;s atmospheric pressure.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Resolving the Problem of Foamy Hydraulic Fluid<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Hydraulic fluid can be treated with an anti-foaming chemical to prevent foam forming. Ester or silicone oil is commonly found in anti-foaming products. There is a thick layer of them on the surface of the fluid and foams. &#8220;Popping&#8221; the bubbles eventually releases trapped air. You can see how they function in this video.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>How to Prevent Hydraulic Oil From Being Contaminated by Air<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Hydraulic oil contaminants include any substance interfering with the fluid&#8217;s correct operation. Because air meets this criterion, any time it gets into the oil, damage to the oil and the other hydraulic system components is specific.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">There are four ways that air can exist:<\/span><\/p>\n<h3><b>1. Dissolved air<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Between 6% and 12% of the volume of hydraulic oil is made up of dissolved air.<\/span><\/p>\n<h3><b>2. Air that has been entrained\u00a0<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Sub-millimeter-sized bubbles of air dissolved in the oil.<\/span><\/p>\n<h3><b>3. Foam<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">a substance used to create foam. Larger-than-average air bubbles collect on the oil&#8217;s surface.<\/span><\/p>\n<h3><b>4. Entrapped Air<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Entrapped air is the most difficult of the four. Free air may generally be eliminated during startup by pre-filling components and properly bleeding the hydraulic system. In most cases, little volumes of foam offer no health or safety concerns. It&#8217;s important to note that enormous volumes of foam can indicate even more severe air contamination and\/or oil decomposition problem.<\/span><\/p>\n<h2><b>Conclusion<\/b><\/h2>\n<p>Foaming hydraulic fluid can lead to serious operational inefficiencies, from reduced lubrication to premature fluid degradation. Addressing this issue requires selecting the right hydraulic fluids engineered to resist foaming and air contamination. At <strong>BioBlend<\/strong>, we offer high-quality options like <a href=\"https:\/\/www.bioblend.com\/product\/bioflo-aw\/\" target=\"_new\" rel=\"noopener\">BioFlo AW<\/a> and <a href=\"https:\/\/www.bioblend.com\/product\/bioflo-synthetic-aw\/\" target=\"_new\" rel=\"noopener\">BioFlo Synthetic AW<\/a> to optimize hydraulic system performance. Discover our full range of <a href=\"https:\/\/www.bioblend.com\/products\/\" target=\"_new\" rel=\"noopener\">products<\/a> or reach out to our team via the <a href=\"https:\/\/www.bioblend.com\/contact-us\/\" target=\"_new\" rel=\"noopener\">Contact Us page<\/a> for expert recommendations tailored to your needs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Foaming in hydraulic fluid is more than a minor inconvenience\u2014it can significantly impact your system&#8217;s performance and longevity. At BioBlend, we specialize in providing advanced hydraulic fluids like BioFlo AW and BioFlo Synthetic AW that are engineered to minimize foam formation and air contamination. Explore our products to find the perfect solution for your system [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","inline_featured_image":false,"footnotes":""},"class_list":["post-3523","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Foaming Hydraulic Fluid: What Causes it + How to Fix<\/title>\n<meta name=\"description\" content=\"Learn what causes hydraulic fluid to foam and how to prevent it. 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