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How to Classify Hydraulic Oil? What Are the Specifications? Time: 2014-01-20 Source: http://
Hydraulic oil is an essential component in hydraulic systems, playing a crucial role in power transmission, lubrication, and cooling. It is classified into different types based on its base oil, additives, and performance characteristics. Understanding these classifications can help users choose the right oil for their specific applications.
1) There are seven main types of mineral-based hydraulic oils: L-HH (mechanical oil), L-HL (general-purpose machine tool hydraulic oil), L-HR (hydraulic oil with oxidation resistance), L-HM (precision machine tool guide oil with anti-wear properties), L-HG (hydraulic guide oil or precision machine tool guide oil), L-HV (low-temperature or low pour point hydraulic oil, also known as high viscosity index oil or thickened hydraulic oil), and L-HS (synthetic low-temperature hydraulic oil).
2) Flame-retardant hydraulic oils include five categories: L-HFA (oil-in-water emulsion, high water content hydraulic fluid), L-HFB (water-in-oil emulsion), L-HFC (water-ethylene glycol flame-retardant fluid), L-HFDR (phosphate ester flame-retardant fluid), and L-HEES (synthetic ester-based flame-retardant fluid). These are used in environments where fire safety is a priority.
3) Special hydraulic oils are designed for specific industries or applications. This includes aviation hydraulic oil, aviation flame-retardant hydraulic oil, and hydraulic oil used in ships, guns, and other specialized equipment.
In metallurgical production, most hydraulic systems operate under high pressure and flow rates with strict control requirements. Therefore, hydraulic oil must meet high-performance standards. Among all types, L-HM anti-wear hydraulic oil is the most commonly used. For fire-resistant applications, L-HFC water-ethylene glycol hydraulic fluid is typically preferred due to its excellent fire resistance and stability under extreme conditions.
1) There are seven main types of mineral-based hydraulic oils: L-HH (mechanical oil), L-HL (general-purpose machine tool hydraulic oil), L-HR (hydraulic oil with oxidation resistance), L-HM (precision machine tool guide oil with anti-wear properties), L-HG (hydraulic guide oil or precision machine tool guide oil), L-HV (low-temperature or low pour point hydraulic oil, also known as high viscosity index oil or thickened hydraulic oil), and L-HS (synthetic low-temperature hydraulic oil).
2) Flame-retardant hydraulic oils include five categories: L-HFA (oil-in-water emulsion, high water content hydraulic fluid), L-HFB (water-in-oil emulsion), L-HFC (water-ethylene glycol flame-retardant fluid), L-HFDR (phosphate ester flame-retardant fluid), and L-HEES (synthetic ester-based flame-retardant fluid). These are used in environments where fire safety is a priority.
3) Special hydraulic oils are designed for specific industries or applications. This includes aviation hydraulic oil, aviation flame-retardant hydraulic oil, and hydraulic oil used in ships, guns, and other specialized equipment.
In metallurgical production, most hydraulic systems operate under high pressure and flow rates with strict control requirements. Therefore, hydraulic oil must meet high-performance standards. Among all types, L-HM anti-wear hydraulic oil is the most commonly used. For fire-resistant applications, L-HFC water-ethylene glycol hydraulic fluid is typically preferred due to its excellent fire resistance and stability under extreme conditions.
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