Category: Hydraulic Fluid

Selection of Hydraulic Fluid

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Many petroleum and synthetic fluids are available and more are being formulated. The highly technical formulations of the fluids with their various pros and cons makes the selection of such fluids difficult for those who are not thoroughly acquainted with the latest improvements and new formulations. Generally, hydraulic fluids are chosen based on considerations of […]

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Synthetic Hydraulic Fluids

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Synthetic fluids on the whole have excellent fire resistant properties. Many of these fluids may be used at high temperatures, and some are quite expensive. Such fluids are named after their base stocks, that is, the predominant material, and their formulations are chemically involved. Phosphate ester base fluids are used in both aircraft and industrial […]

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Petroleum Base Fluids

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Petroleum base oils are by far the most commonly used hydraulic fluid. Petroleum, a complex mixture of chiefly hydrocarbons, must be highly refined to produce a fluid with viscosity characteristics suitable for hydraulic control systems. Such mineral, turbine, or light oils, as they are often called, have a long history of satisfactory performance as a […]

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Biodegradable Fluid

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Biodegradable Fluid

Biodegradable working fluid is decomposed by microbes to CO2 and H2O, and, therefore, does not have a negative impact on the environment. Base oil is primarily polyethylene glycol or vegetable oil (rape seed oil). The demand for biodegradable working fluid is particularly high for equipment used outdoors, such as excavators and tunnel linings. Table 14.9 […]

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Fire Resistant Fluid

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Fire Resistant Fluid

Whenever fire is present around hydraulic equipment, it cannot be over stated that operators and personnel working in the vicinity are always in danger from potential fire disasters. Working fluid compressed within the equipment can possibly burst out through fractures, cracks, and pinholes. It is almost impossible to stop leakage from the equipment, if it […]

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Contamination Measurement Instruments

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Contamination Measurement Instruments

A Contami-Kit is portable and simple. It filters a sample of working fluid, and gathers particles on a membrane filter. The distribution and number of particles are observed with a microscope, and the level of contamination is determined by compared to the standard contamination plates. This kit has the same system of the JIS B […]

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Application Limit

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Application Limit

General working fluid, as new oil, contains moisture in the amount of 50-80 ppm (0.005-0.008 percent). But, the ratio increases with moisturized air injected by actuators and air breathers. Moisture generates rust on the inner walls of hydraulic equipment, and enhances the deterioration of lubricants and working fluids. Measurement of moisture in working fluid is […]

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Contamination Control

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Contamination Control

There are three reasons for working fluid to be replaced. (1) Change in quality and deterioration of working fluid (2) Dust or external elements mingled in working fluid (3) Moisture mingled in working fluid during its operation Table 14.3 is a reference for deterioration and quality change. Contamination by dust and moisture is common, and […]

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Viscosity

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Viscosity

Kinematic viscosity (absolute viscosity divided by density) [m2/s] is used to determine the value of viscosity of industrial lubricants, such as working fluid. Practically, mm square per second [mm2/s] is used, and its value is the same as the value of customary employed centistokes [cSt]. The process of viscosity calculation is specified in ‚ÄúDetermination of […]

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Petroleum-Based Fluid

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Petroleum-Based Fluid

Working fluid with the equivalent viscosity of turbine oil in petroleum lubricant is selected. There are two types of turbine oil: turbine oil without additives (first type) and with additives (second type). The second type contains anti-rust additives and antioxidants, etc. Working fluids manufactured under the following are widely used. 1) JIS K 2213 second […]

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