液压油滤芯在生产厂家的产品样本或标牌上标注的是名义精度，而非绝对过滤精度，只有经过实验测试的β值才能表示滤芯的过滤能力。液压油滤芯还要求满足压力损失的要求，以保证流量与滤芯的使用寿命的最优化。
在选用滤芯时可选用原装件，也可选用第二品牌。须注意的是：要对所选的滤芯进行验收，检验它是否符合其应具有的性能指标。
1. 过滤精度
首先，根据液压系统的需要确定用污渍的清洁度等级，在根据此清洁度等级按附表选择滤油器的过滤精度。工程机械上常用的液压油滤芯名义过滤清洁度为10μm
液压油清洁度（ISO4406）滤芯的名义过滤精度μm应用范围
13/10 3 液压伺服阀
16/13 5 液压比例阀
18/15 10 一般液压元件（10Mpa）
19/16 20 一般液压元件（＜10Mpa）
由于名义精度不能真实的反映滤芯的过滤能力，因此，常以在规定的实验条件下过滤器可以通过的最大硬质球形颗粒的直径作为其绝对过滤精度，用以直接反映新装滤芯初期的过滤能力。
评定液压油滤芯的最主要标准时按照ISO4527-1981E（多次通过实验）测定的β值，即让混入标准实验粉末的油多次循环通过滤油器，其进油口和出油口两侧的粒子数之比。
2. 流量特性
滤芯通过油液的流量与压力降是流量特性的重要参数，按ISO3968-91标准进行流量特性实验，以绘制流量—压力降特性曲线图，在额定供油压力下，总压降（过滤壳体压降与滤芯之和）一般应在0.2Mpa以下。
3. 滤芯强度
应按照ISO2941-83标准进行破裂—抗冲击实验，滤芯损坏时急剧下降的压力差应大于规定值。
4. 流动疲劳特性
应按照ISO3724—90标准进行10万次循环的疲劳实验。
5. 对液压油适应性的实验
应按照ISO2943—83标准进行压力流承受力的实验，以验证滤材对液压油的相容性。
The hydraulic oil filter manufacturers product samples or signs marked the nominal precision, rather than absolute filtration accuracy, only after the β value of the experimental test to the filtering capacity of the filter. The hydraulic oil filter is also required to meet the requirements of the pressure loss, and to ensure the optimization of the flow and filter life.
Selection of original pieces in the selection of the filter can also choose the second brand. It should be noted that: inspection, testing whether it meets the performance indicators that should have to be selected filter.
1. Filter accuracy
First of all, according to the needs of the hydraulic system to determine the cleanliness level stains, select Schedule under this cleanliness level of filtering precision of the oil filter. Commonly used in construction machinery, hydraulic oil filter nominal filter cleanliness 10μm
On behalf of the hydraulic oil cleanliness (ISO4406) cartridge filtration μm range of applications
13/103 hydraulic servo valve
16/135 hydraulic proportional valve
18/15 10 General hydraulic components (> 10Mpa)
19/16 20 General hydraulic components (<10Mpa)
Nominal accuracy is not a true reflection of the filter filtering capabilities, therefore, often the filter can be under the specified experimental conditions, the largest hard spherical particles having a diameter as the absolute filtration accuracy used to directly reflect the filtration capacity of the the Newly filter initial .
The most important standard for assessment of the hydraulic oil filter in accordance with ISO4527-1981E (multiple experiments) the determination of the value of β, that allow mixed with standard experimental powder oil repeatedly cycle through the oil filter, its oil inlet and oil outlet both sides The ratio of the number of particles.
2. Flow characteristics
Filter through the fluid flow and pressure drop is the flow characteristics of the important parameters, according to ISO3968-91 standard for flow characteristics experiments, to draw the flow - pressure drop characteristics graph, in the nominal supply pressure, the total pressure drop (filter housing The pressure drop of the filter and) should generally be in the the 0.2Mpa following.
3. Filter strength
In accordance with ISO2941-83 standards broken - impact experiments, the sharp drop in pressure in the filter is damaged should be greater than the specified value.
4. Flow fatigue characteristics
100,000 cycles of fatigue experiments should be carried out in accordance with the ISO3724-90 standard.
5 experimental adaptability of hydraulic oil
Should be carried out in accordance with the ISO2943-83 standard pressure flow endurance experiments to verify the compatibility of the filter of the hydraulic oil.
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