{"id":3655,"date":"2026-10-21T12:30:46","date_gmt":"2026-10-21T04:30:46","guid":{"rendered":"http:\/\/www.snapchatsell.com\/blog\/?p=3655"},"modified":"2026-10-21T12:30:46","modified_gmt":"2026-10-21T04:30:46","slug":"how-to-prevent-reverse-flow-in-hawe-pump-4df0-665ff3","status":"publish","type":"post","link":"http:\/\/www.snapchatsell.com\/blog\/2026\/10\/21\/how-to-prevent-reverse-flow-in-hawe-pump-4df0-665ff3\/","title":{"rendered":"How to prevent reverse flow in HAWE Pump?"},"content":{"rendered":"

Hey there! If you\u2019re dealing with HAWE hydraulic pumps, you probably know how crucial it is to keep reverse flow from ruining your system\u2014whether you\u2019re running a mobile crane, an industrial press, or a fleet of mining equipment. As a HAWE pump supplier who\u2019s been on the ground for years, I\u2019ve seen first-hand what happens when reverse flow slips through: unplanned downtime, component wear, even whole-system failures that cost way more than fixing the issue upfront. This isn\u2019t just a \u201cset it and forget it\u201d thing\u2014reverse flow in HAWE pumps isn\u2019t some obscure myth, it\u2019s a real problem that pops up when you cut corners or skip basic checks. Let\u2019s break down how to stop it cold, no fancy jargon, just straight talk that works for actual technicians and operators. HAWE Pump<\/a><\/p>\n

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First, let\u2019s get on the same page: what is reverse flow anyway? For anyone new here, it\u2019s when fluid moves backward through your HAWE pump instead of the direction you need it to. Usually, this happens because of pressure differences\u2014like when a load on a hydraulic cylinder suddenly drops, creating a backflow that pushes fluid back through the pump\u2019s inlet. HAWE pumps (especially their axial piston and vane models, which are super popular) are designed for unidirectional flow, so reverse flow doesn\u2019t just mess up the pump itself\u2014it can damage valves, hoses, and even the prime mover. I\u2019ve had customers tell me their pump\u2019s internal parts wore out in half the expected time because reverse flow was going unchecked. That\u2019s avoidable.<\/p>\n

Now, the number one fix for reverse flow in HAWE pumps: make sure your directional control valves (DCVs) are sized and installed correctly. Wait, I know what you\u2019re thinking\u2014\u201cEveryone says that, but why does it matter so much for HAWE specifically?\u201d HAWE\u2019s DCVs are precision-made to match their pump\u2019s flow rate, so if you grab a generic valve from the hardware store (no shade, but it\u2019s true) that\u2019s either too small or too big, you\u2019re begging for backflow. Too small, and the valve can\u2019t hold pressure fast enough when your system cycles, letting fluid slip backward. Too big, and there\u2019s dead volume in the valve that creates pressure spikes that trigger reverse flow. Last month, a guy from a construction company hit me up saying his HAWE V60N pump was reversing during boom extension\u2014turns out his tech had swapped the original HAWE DCV for a cheaper one that was 2mm too wide. Swapping it back fixed it overnight. Pro tip: always match the DCV\u2019s Cv rating (that\u2019s flow capacity) to your HAWE pump\u2019s maximum flow. If you\u2019re not sure, just shoot me a message\u2014no need to overthink it.<\/p>\n

Next up, check your check valves (also called non-return valves) for HAWE compatibility. These are the \u201cone-way gates\u201d in your system, and they\u2019re your first line of defense against reverse flow. But not all check valves work with HAWE pumps. A lot of off-brand check valves leak at the seal, so even if they\u2019re in line, fluid creeps backward. HAWE makes their own inline check valves that are tested to handle the exact pressure spikes their pumps produce, so if you\u2019re using a third-party one, you\u2019re taking a risk. Wait, but I see this a lot: people install a check valve, but they put it on the wrong side. If it\u2019s on the inlet instead of the outlet, you\u2019re just trapping air, not stopping reverse flow. I once had a farmer come to me with a HAWE pump for his grain auger\u2014his check valve was backwards, so every time he turned the pump off, fluid ran back into the reservoir. That\u2019s a dumb easy fix, but it\u2019s super common. Also, make sure your check valve\u2019s cracking pressure (the minimum pressure needed to open it) is right. If it\u2019s too high, your pump has to work harder, which can lead to overpressure that causes reverse flow; too low, and it opens too easily, letting backflow through. For HAWE\u2019s medium-pressure pumps (like the V30 series), a cracking pressure of 0.5 bar is sweet spot\u2014no more, no less.<\/p>\n

Then there\u2019s pressure relief valves, and yes, they tie into reverse flow. I know, pressure relief is for overpressure, but hear me out: if your system\u2019s relief valve is set too low, it can trigger reverse flow during a sudden load drop. HAWE pumps generate consistent pressure, so if your relief is calibrated for a lower number, it\u2019ll \u201crelieve\u201d pressure by letting fluid backflow through the pump. A lot of people use a generic relief valve that\u2019s not matched to their HAWE pump\u2019s pressure rating. For example, a HAWE Pump with a 350 bar max rating needs a relief valve set to 320\u2013330 bar, not 250 bar. If you set it lower, you\u2019re basically inviting reverse flow when the system cycles. Last week, a manufacturing plant\u2019s line went down because their relief valve was set too low on a HAWE C60 pump\u2014backflow damaged the cylinder seal, and they lost 8 hours of production. Calibrating your relief valve to match your HAWE pump\u2019s specs is non-negotiable.<\/p>\n

Now, let\u2019s talk about installation and mounting, because even the best parts won\u2019t work if you mess up the setup. HAWE pumps have specific orientation requirements, especially axial piston models. If you mount the pump incorrectly\u2014like tilting it too far from its recommended angle (usually +\/-10 degrees from horizontal for most models)\u2014the internal pistons can move unevenly, creating pressure imbalances that lead to reverse flow. I once saw a pump mounted sideways on a mobile truck crane\u2014after a week, reverse flow started, and the piston wear was visible just from the angle being off. Also, make sure your inlet line is sized right. If it\u2019s too small, cavitation happens, which creates low pressure on the inlet side, pulling fluid backward through the pump. HAWE\u2019s guidelines say inlet lines should have a flow velocity of 1\u20132 m\/s for their pumps\u2014any faster, and you\u2019re asking for cavitation and reverse flow. I\u2019ve had a few customers use \u00bd\u201d inlet lines on a HAWE V60N (which needs \u00be\u201d) and that\u2019s exactly what caused their reverse flow issues. Fixing the line size and mounting angle was all it took, no new parts needed.<\/p>\n

Another thing that\u2019s easy to overlook: fluid contamination. Hydraulic fluid is the lifeblood of your HAWE pump, and if it\u2019s dirty, it can gum up internal components like the poppet in check valves or the spool in directional valves. A gummed-up check valve won\u2019t close all the way, so reverse flow happens. A spool stuck in the middle will let fluid move both ways. I see this all the time\u2014customers skip regular fluid changes, and after a few months, reverse flow pops up. HAWE recommends using ISO 46 or 68 hydraulic fluid (depending on the model) and changing it every 1000 operating hours, plus replacing the filter every 500 hours. Last month, a mining company\u2019s HAWE pump started reversing, and when we checked the fluid, it had metal shavings from a worn filter. Flushing the system and replacing the filter fixed the reverse flow in a day. It\u2019s not just about keeping your pump clean\u2014dirty fluid is a silent cause of reverse flow.<\/p>\n

Wait, what about when reverse flow is from the pump itself, not the rest of the system? Rare, but it happens. HAWE pumps have internal seals and valve plates that wear out over time, especially if you\u2019re running them at maximum pressure 24\/7. If the internal valve plate is scratched, it can\u2019t direct flow properly, so backflow occurs. Or the inlet check valve inside the pump (yes, most HAWE pumps have an internal one) is worn, so it leaks. How do you tell if it\u2019s the pump vs. the rest of the system? Disconnect the hoses from the pump and run it idle\u2014if fluid still flows backward, it\u2019s the pump. If not, it\u2019s your valves or lines. For internal wear, you don\u2019t have to replace the whole pump\u2014you can swap out the valve plate and internal seals, which is way cheaper. As a HAWE supplier, I stock all the replacement parts for their common models, so you don\u2019t have to wait weeks for a custom order.<\/p>\n

Now, let\u2019s talk about common mistakes to avoid. First, don\u2019t \u201crig\u201d a fix. I\u2019ve seen people tape a check valve in or use a random valve from a different brand to save money\u2014it works temporarily, but it\u2019ll cause more reverse flow later. HAWE parts are engineered to work together, so using generic parts is a risk. Second, don\u2019t ignore small signs. If your system is a bit slower than usual or you hear a weird whining noise when you turn the pump off, that\u2019s reverse flow starting. Fix it early, and you won\u2019t have to pay for a whole new pump. Third, don\u2019t skip routine checks. Every month, do a quick inspection of your valves, lines, and fluid\u2014even 10 minutes can catch reverse flow before it causes damage.<\/p>\n

Let me wrap this up with a quick real example. A customer who runs a fleet of 12 HAWE V30 pumps for their dump trucks was having reverse flow issues on 3 of them. They tried swapping valves, checking lines, but nothing worked. We did a quick check: their relief valves were set at 280 bar, but their pumps max out at 320. Calibrating those valves to 310 bar fixed all 3, and they saved $10k in potential pump repairs. That\u2019s the thing about HAWE pumps\u2014they\u2019re super reliable when you work with their specs, not against them.<\/p>\n

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At the end of the day, preventing reverse flow in HAWE pumps is about matching your components, installing them right, and keeping your system clean. It\u2019s not rocket science, but it does take paying attention to details that a lot of people skip. If you\u2019re dealing with reverse flow and you\u2019re not sure what\u2019s going on\u2014whether you need help sizing a valve, checking your pump\u2019s internal parts, or just replacing a worn check valve\u2014hit me up to connect and talk through your specific setup. I\u2019ve worked with all kinds of HAWE pump models, from mobile to industrial, so I can point you in the right direction. Don\u2019t let reverse flow mess up your operation\u2014fix it before it\u2019s a big problem.<\/p>\n

YUKEN Pump<\/a> References
\nHAWE Hydraulics. (2022). Installation and Operation Manual for Axial Piston Pumps.
\nHydraulic Institute. (2021). Guidelines for Hydraulic System Fluid Contamination Control.
\nHAWE Hydraulics. (2023). Directional Control Valve and Pump Compatibility Guide.
\nMobile Hydraulics Association. (2022). Best Practices for Preventing Reverse Flow in Mobile Hydraulic Systems.<\/p>\n

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Fujian Zhenyuan Hydraulic Equipment Co., Ltd.<\/a>
Fujian Zhenyuan Hydraulic Equipment Co., Ltd. is well-known as one of the leading hawe pump manufacturers and suppliers in China. If you’re going to wholesale hawe pump in stock, welcome to get quotation from our factory. All customized products are with high quality and low price.
Address: No. 125, Wuli Industrial Zone, Jinjiang, Quanzhou City, Fujian Province
E-mail: yexun@fjzhenyuan.com
WebSite: https:\/\/www.zhenyuanhydraulic.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Hey there! If you\u2019re dealing with HAWE hydraulic pumps, you probably know how crucial it is … How to prevent reverse flow in HAWE Pump?<\/span>Read more<\/a><\/p>\n","protected":false},"author":956,"featured_media":3655,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3618],"class_list":["post-3655","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-hawe-pump-419d-6723a3"],"_links":{"self":[{"href":"http:\/\/www.snapchatsell.com\/blog\/wp-json\/wp\/v2\/posts\/3655","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.snapchatsell.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.snapchatsell.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.snapchatsell.com\/blog\/wp-json\/wp\/v2\/users\/956"}],"replies":[{"embeddable":true,"href":"http:\/\/www.snapchatsell.com\/blog\/wp-json\/wp\/v2\/comments?post=3655"}],"version-history":[{"count":0,"href":"http:\/\/www.snapchatsell.com\/blog\/wp-json\/wp\/v2\/posts\/3655\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.snapchatsell.com\/blog\/wp-json\/wp\/v2\/posts\/3655"}],"wp:attachment":[{"href":"http:\/\/www.snapchatsell.com\/blog\/wp-json\/wp\/v2\/media?parent=3655"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.snapchatsell.com\/blog\/wp-json\/wp\/v2\/categories?post=3655"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.snapchatsell.com\/blog\/wp-json\/wp\/v2\/tags?post=3655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}