How to choose when buying hydraulic oil

2022-08-24
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How to choose

1 when buying hydraulic oil, the basis for selecting hydraulic oil

(1) hydraulic parts. Different hydraulic components have a minimum configuration requirement for the hydraulic oil used. Therefore, when selecting hydraulic oil, attention should be paid to the compatibility of the types of hydraulic parts and the materials, seals, coatings or paints used with the hydraulic oil, so as to ensure that all moving pairs are well lubricated, so that the components can reach the design life and meet the requirements of service performance

hydraulic pump is one of the most sensitive components to the viscosity and viscosity temperature performance of hydraulic oil. Therefore, the requirements of the pump for hydraulic oil in the system are often taken as an important basis for selecting hydraulic oil (except for the system with servo valve)

(2) system working condition. If the actuator is likely to cause personal injury or even death, the higher the requirements for the speed, system pressure and mechanism action accuracy of the traveling mechanism, the higher the requirements for the wear resistance and bearing capacity of the hydraulic oil

according to the possible working temperature of the system, continuous operation time and the sanitation of the working environment, attention must be paid to the viscosity, high temperature performance and thermal stability of the oil when selecting oil, so as to reduce the formation and deposition of oil sludge

(its characteristic is that the relative error of all levels of dial decreases with the increase of load 3) the size of oil tank. The smaller the oil tank, the higher the requirements for oil oxidation safety, extreme pressure and wear resistance, air release and filtration

(4) ambient temperature. According to the characteristics of ambient temperature such as underground, water, indoor, outdoor, cold areas, or cold areas with temperature changes, and whether there is high-temperature heat source or open fire nearby, hydraulic oil should be reasonably selected. If there is no open fire nearby, the working temperature is below 60 ℃ and the load is light, ordinary hydraulic oil can be selected. If the equipment must be started at a very low temperature, low pour point hydraulic oil must be selected

to sum up, if the quality of the hydraulic oil is qualified, and the movement speed of the system actuator is very high, the flow rate of the oil is also high, the hydraulic loss increases, and the leakage is relatively reduced, so the oil with low viscosity should be selected; On the contrary, when the flow rate of oil is low, the leakage will increase relatively, which will affect the movement speed of the working mechanism. Therefore, it is appropriate to choose oil with higher viscosity. Generally, when the working pressure is high, hydraulic oil with high viscosity should be selected, because solving the leakage problem at high pressure is more priority than overcoming its viscosity resistance; When the working pressure is low, the oil with low viscosity should be selected. When the ambient temperature is high, the oil with higher viscosity should be used; on the contrary, the oil with lower viscosity should be used

(5) final determination of hydraulic oil. After the hydraulic oil is preliminarily selected, it is also necessary to check its supply source, viscosity, quality, use characteristics, scope of application, and the compatibility with the system and component materials to see whether all indicators can fully meet the use requirements

(6) economy. We should comprehensively consider the price, service life, hydraulic system and maintenance, safe operation cycle and other conditions of hydraulic oil, and focus on brands with good economic benefits

2. Economic analysis of selecting hydraulic oil

when selecting hydraulic oil, we should not only pay attention to the oil price, but also ignore the variety, quality, maintenance and regeneration. For example, in high-temperature, high-pressure and precision hydraulic systems near high-temperature heat sources and open flames, we should choose phosphate ester liquid fire-resistant hydraulic oil, and we should not replace it with cheap water-containing fire-resistant fluid because of its high price, which will cause premature wear of hydraulic pumps and reduce the accuracy of the system; For another example, in the high-pressure hydraulic system, anti-wear hydraulic oil should be selected. If cheap mechanical oil or anti rust and anti oxygen hydraulic oil is selected, the hydraulic pressure can make the graphene battery achieve a big breakthrough in conductivity and charging speed, and the service life of the pump will be shortened. Take the varieties l-hh and L "we all want to build safer HM oil with ISO viscosity grade vg46 as examples, which are respectively used in the same yb-d25 vane pump (pressure: 12.5mpa, temperature: 65 ℃, speed: 1500r/min) After continuous operation for 250h, the wear of the pump with l-hh oil is 63 times that with L-HM oil. Therefore, in the medium and high pressure system, l-hh or L-HL oil should not be used, but L-HM anti-wear hydraulic oil should be selected

for high-pressure systems operating in cold and severe cold areas, low temperature hydraulic oil with high viscosity index should be selected in case of low temperature and large changes in ambient temperature, so as to make the low-temperature oil of the system have good fluidity and easy cold start, and also make the system use the same oil in winter and summer, so as not to change more frequently

high quality anti-wear hydraulic oil has high thermal stability, good hydrolytic stability, strong demulsification ability, short air release time and long service life, which can improve the operation condition of the system. Therefore, high-quality hydraulic oil should be used in high-performance hydraulic system

select high-quality hydraulic oil. Although the oil price is relatively expensive, the service life of the oil is long, the wear of hydraulic components is less, the system maintenance is easy, and the production efficiency is high. Therefore, the overall economic benefit is still cost-effective

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