Hydraulic filters, this thing is really important for the hydraulic system! Its main job is to remove the garbage in the oil and ensure the smooth operation of the machine. Choosing a suitable filter can not only make the system run faster but also make your equipment last for a few more years with fewer problems. Then the question is, how to choose? Don't worry, I will give you a few tips: first look at how fine the filtration is, then how much oil needs to pass per hour, and also look at the pressure during work, the use environment, and finally what kind of filter. Follow these steps, and you will choose a good filter!

1. Filter accuracy

When choosing a hydraulic filter, you must first look at the filter's accuracy. Because there are all kinds of pollution particles of various sizes in the hydraulic system, filters of different accuracy are required. In simple terms, the higher the accuracy, the smaller the particles that can be blocked.

When it comes to large particles (over 50 microns), you have to use a coarse filter to deal with them, which is especially suitable for those environments that are not too dirty or for preliminary filtration.

For those medium-sized particles (10 to 50 microns), medium-precision filters can come in handy, which are commonly used in general industrial hydraulic systems.

As for those particularly diminutive particles (less than 10 microns), fine filters are needed. High-demand places, such as aviation, aerospace, and precision machinery, all rely on them to keep clean.

2. Flow requirements

The oil flow in the hydraulic system is another crucial factor in selecting filters. The filter needs to handle all the oil flowing through without affecting the normal operation of the system.

Rated flow: The filter should be able to handle the maximum flow demand of the system. When selecting a filter, make sure that its rated flow is higher than or equal to the maximum flow of the system.

Pressure drop: The filter will produce a certain pressure drop when working. When selecting, consider that the pressure drop at the maximum flow does not exceed the allowable range of the system.

3. Working pressure

The operating pressure of the hydraulic system has a direct impact on the selection of the filter. Various filter designs have different pressure-bearing capacities. When selecting, it is necessary to ensure that the filter can operate stably under the working pressure environment of the system.

Low-pressure filter: Suitable for systems with low operating pressure, usually withstanding pressure within 10MPa.

Medium-pressure filter: used in medium-pressure environments, with a pressure range of 10-30MPa.

High-pressure filter: designed for high-pressure hydraulic systems, with a pressure of more than 30MPa.

4. Use environment

The selection of filters depends on where they are used. For example, for machines indoors, the environment is stable, so it is easier to choose filters. But if you are outdoors, like those excavators, tractors, etc., you must find filters that can withstand wind, sun, rain, and dust. For example, machines working in some special places may encounter corrosion or very high or low temperatures. At this point, you have to choose a special filter that may be made of stainless steel or other heat-resistant materials.

5. Filter type

The classification of hydraulic filters is based on their installation location and function. Each type has unique applications and advantages.

The oil suction filter is the guardian of the hydraulic pump. It guards the entrance like a doorman, bravely intercepts all kinds of large garbage, and ensures that the hydraulic pump can operate safely and smoothly. The pressure filter is the gatekeeper of quality. It strictly screens impurities in high-pressure oil and protects downstream equipment from contamination. The return oil filter is located on the return oil pipeline of the hydraulic system. Its task is to ensure the purity of the returned oil and prevent contaminants from entering the oil tank. The ventilation filter is like an air guard. It is high above the oil tank and filters impurities in the air to prevent them from sneaking into the fur tank. The bypass filter is an unsung hero. It continuously purifies the oil without interfering with the system's operation to keep the hydraulic system clean and efficient.

Conclusion

Choosing the right hydraulic filter is essential to ensure the efficient and stable operation of the system. When selecting a filter, you should consider multiple factors, such as filtration accuracy, flow, pressure, use environment, and filter type, to ensure that you choose the most suitable filter. Reasonable selection can effectively improve operating efficiency, extend the service life of equipment, reduce the occurrence of failures, and save maintenance and replacement costs. Whether it is equipment in factories, projects, or farms, finding the right filter can ensure that they can work steadily in various places. So, when choosing, you have to think about your needs and situation and make a wise choice.