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Hydraulic Filters: A Basic Guide

hydraulic filters

To ensure proper functioning of hydraulic system components, it is critical to keep the fluid clean, as dirt and other contaminants can cause component damage and reduce system efficiency. Contamination can trigger equipment failure and costly downtime, so choosing the right hydraulic filters for your machine is crucial. This guide to hydraulic filters will help you make informed choices that ensure successful operation and longevity of your equipment.

What is hydraulic filter?

Hydraulic Filters

Hydraulic filters are a component in a hydraulic system that remove harmful particles by forcing hydraulic fluid through porous filter elements. This protects hydraulic system components from damage caused by oil contamination caused by particles or other in-service hydraulic fluid contamination. Because hydraulic oil is easily contaminated by contaminants. So the filter element traps contaminants and prevents them from re-entering the fluid flow and damaging other equipment downstream. Common contaminants include dirt, water, and reactive chemicals. Their size is in the micron range, which means hydraulic filters must be appropriately sized to filter out even the smallest particles.

Types of hydraulic filter

Hydraulic systems meet the diverse needs of machinery and heavy equipment. Unfortunately, if left unchecked, the presence of small debris or particles can cause irreversible damage to hydraulic systems. Over time, this can destroy the efficiency and longevity of the system. Particles or contaminants can enter hydraulic systems for a number of reasons, such as seal failure. However, the most common situation is when the cap or seal is removed during routine maintenance. To prevent any substances from entering the system, the correct type of hydraulic filters should always be used. So what types of hydraulic filters are there? The specific classification of hydraulic filters is as follows:

Types of hydraulic filter

Oil suction filter element

Since it is used to absorb oil, the installation position of the filter element must be at the oil inlet pipe, which can effectively block impurities with larger particles and ensure the normal operation of the hydraulic pump.

Return oil filter element

Just the opposite of the oil suction filter element, this filter element is located in the return line, which can further improve the purity of the oil in the tank.

High pressure filter element

High pressure refers to high-pressure pulsating pressure impact, so this filter element has very high strength requirements. On the outlet pipe of the hydraulic pump, the high-pressure filter element is definitely a powerful barrier to maintain the cleanliness of the entire hydraulic system.

Air filter element

This filter element is like a mask, not in appearance, but in function. The person wearing the mask is the fuel tank. The oil in the fuel tank will not remain unchanged. Changes in oil volume mean that the air pressure inside the fuel tank is also changing, the air will bring some pollutants into the fuel tank. The air filter element actively manages them.

Circulation filter element

This filter element is located on the oil tank circulation circuit. It is suitable for hydraulic systems that have high requirements for cleanliness.Coolers frequently make use of it.

Alternative brand filter element

The alternative brand filter products produced by our Btlas Filter include hydraulic filter donaldson, hydac hydraulic filter, pall hydraulic filter, mahle hydraulic filter element, etc. If you have needs, please feel free to contact us.​

What types of hydraulic filter do I need?

The best type of hydraulic filters depends entirely on the structure of the system. Filters operating on pressure lines must withstand a higher pressure than the line output to ensure successful operation. For example, return filters typically can only withstand the back pressure of the water flow. Back pressure fluctuates due to flow intensity and pressure differentials created by plugged elements. If the return filter does not exceed the maximum back pressure slightly, the filter will not operate properly during normal pressure fluctuations.


Hydraulic filters are an important component of any hydraulic system. They protect your machine’s hydraulic system components from dirt particles, corrosion and wear by ensuring maximum hydraulic oil purity. Drawing on many years of experience and filtration expertise, Btlas offers you tailor-made solutions that provide optimal protection for all hydraulic components and systems, permanently protecting machinery and equipment from contamination and premature wear. (Reference article :Hydraulic Filter ElementsHow to Clean and Change Hydraulic Filter in 3 Easy StepsDemystifying Hydraulic Filters: Your Comprehensive Guide to Functionality and Maintenance.)

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