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After reading so many blogs before, everyone must be familiar with the hydraulic filter. Today, let's talk about some unusual knowledge about hydraulic filters.

Main factors affecting the service life of hydraulic oil filter

1. Impact of low-temperature operation

The operation of the system at low temperatures also hurts the filter. Because at low temperature, some non-metallic materials in the filter element will become more fragile; Moreover, at low temperature, the increase of oil viscosity will cause the increase of pressure drop, which is very easy to cause cracks in medium materials.

1. Compatibility between filter element and oil

The filter contains both metal filter elements and most non-metallic filter elements. They all have the problem of compatibility with the oil in the system. This includes the compatibility between chemical changes and thermal effects. In particular, whether it can not be affected under high-temperature conditions is more important.

1. Pressure drop at both ends of hydraulic oil filter

When the oil passes through the filter element, there will be a certain pressure drop at both ends. The specific value of the pressure drop depends on the structure and flow area of the filter element When the filter element receives impurities in the oil, these impurities will stay on the surface or inside of the filter element, shielding or limiting some through holes or channels, reducing the effective area of flow and increasing the pressure drop through the filter element.

How to distinguish the quality of the hydraulic filter element?

1. See if it can meet the national standards, and the filter element that meets the standards is qualified.

1. According to the flow characteristics of the hydraulic oil filter element, the flow and pressure drop of oil passing through the filter element are important parameters of flow characteristics. The flow characteristic experiment shall be stopped according to the iso3968-91 specification to draw the flow pressure drop characteristic curve. Under the rated oil supply pressure, the total pressure drop shall generally be less than 0.2MPa.

1. The filter material used in the low-quality filter element of the hydraulic filter is of poor quality and the filtering effect is very poor, resulting in poor cleanliness grade of the medium and damaging the service life of the maintained components. In serious cases, it may cause damage to the central components of the system; The inferior filter element cuts corners on the materials of pressure bearing components such as the skeleton end cover, greatly shortens the service life of the filter element, and increases the application cost of users; The inferior filter element is shoddy in the manufacturing process, the product is not beautiful, reduces the service life of the filter element, and is easy to damage the filter material, failing the filter element to achieve the filtering effect.

1. The quality of the filter element can also be judged during operation. The oil filter element of the hydraulic filter will circulate and produce bubbles in the oil tank. If there are any bubbles, they may enter the hydraulic pipeline together with the oil. If there are too many bubbles in the pipeline, the pressure of the hydraulic pump will be unstable, which will affect the accuracy of the product.

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