How do you distinguish the types of hydraulic fluids? What does each model mean?

Press GB A 87, hydraulic fluid.

The general form of the model is as follows:

Class + Variety + Number, e.g. L HV 22

Where: l, category (lubricants and related products,).

HV, variety (low temperature anti-wear).

22, grade (viscosity at 40°C).

The viscosity grade of hydraulic fluids is specified by GB 3141, which is equivalent to the ISO viscosity classification method, which is divided by the central value of the kinematic viscosity at 40°C.

HH, HL, HM, HR, H, HG hydraulic oil in the GB 87 classification are mineral oil hydraulic oil, there are many varieties of this kind of oil, and the use of more than 85% of the total hydraulic oil is used in the hydraulic system of automobile and construction machinery.

Most of the commonly used hydraulic fluids also belong to this category.

Introduction of various models of hydraulic oil:

Hydraulic fluids. According to the classification of GB - 87, HH hydraulic oil is a mineral oil without any additives.

Although this oil is included in the classification, it is no longer used in hydraulic systems. Because this oil has poor stability and is easy to foam, it has a short service life in hydraulic equipment.

Hydraulic oil (also known as general purpose machine tool industrial lubricant).

HL hydraulic oil is made from neutral base oils with a high refining depth.

Made with antioxidant and anti-rust additives. HL hydraulic fluids can be classified into six grades according to the kinematic viscosity of 40°C.

3.Anti-wear hydraulic fluid (HM hydraulic fluid).

Anti-wear hydraulic oil (HM hydraulic oil) is developed from the anti-rust and anti-oxidation hydraulic oil, it has alkaline high zinc, alkaline low zinc, neutral high zinc type and ash-free type and other products, they are divided into four grades according to the 40 °C kinematic viscosity.

Hydraulic fluids. HR hydraulic oil is the hydraulic oil used in low and medium pressure hydraulic systems with large changes in ambient temperature. The oil has good anti-rust and anti-oxidation properties, and on this basis, a viscosity index improver is added to make the oil have good viscosity and temperature characteristics. Due to the small amount of this kind of oil, it has not been vigorously developed, so it will not be described in detail here.

HG hydraulic oil was originally 32g and 68g in ordinary hydraulic oil, which was once called hydraulic guide oil, which is a type of hydraulic oil composed of oily agent or friction reducer on the basis of hm hydraulic oil. The oil not only has excellent anti-rust, anti-oxidation and anti-wear properties, but also has excellent anti-stick-slip properties. This product is mainly suitable for various machine tool hydraulic and guide rail lubrication systems or machine tool guide rail lubrication systems and machine tool hydraulic systems.

In the low-speed inert condition, the anti-climb effect is good. Current hydraulic guide oils belong to this category of products.

Hydraulic oil (cryogenic hydraulic fluid).

These are two different grades of hydraulic oil, both of which are used in a wide range of temperature variations in GB 187. Both oils have a low pour point, excellent wear resistance, low temperature fluidity and low temperature pumpability. HV and HS hydraulic oil are divided into mineral oil type and synthetic oil type according to the base oil, and H oil is divided into six grades according to the kinematic viscosity of 40°C.

HS oil is divided into four grades.

It is distinguished by viscosity and the relationship between viscosity and temperature.

It seems to be viscous, and the higher the label, the thicker the oil.

1. HH hydraulic oil is a kind of mineral oil without any additives. Although this oil is included in the classification, it is no longer used in hydraulic systems.

2. HL hydraulic oil is made of neutral base oil with high refining depth, plus antioxidant and anti-rust additives. HL hydraulic fluids can be divided into six grades according to the kinematic viscosity of 40.

3、hm。Anti-wear hydraulic oil (HM hydraulic oil) is developed from the anti-rust and anti-oxidation hydraulic oil, it has alkaline high zinc, alkaline low zinc, neutral high zinc type and ash-free type and other series of products, they are all according to 40'cKinematic viscosity is divided into four grades.

The types of hydraulic oil are generally distinguished by viscosity, generally No. 32, No. 46, No. 68, etc

The viscosity of No. 32 hydraulic oil is generally around 32, and the viscosity here is the kinematic viscosity of 40, and so onHydraulic fluids.

Hydraulic oil is the hydraulic medium used in the hydraulic system using liquid pressure energy, which plays the role of energy transfer, anti-wear, system lubrication, anti-corrosion, anti-rust and cooling in the hydraulic system.

For hydraulic oil, first of all, it should meet the requirements of the liquid viscosity of the hydraulic device at the working temperature and the starting temperature, because the viscosity change of the lubricating oil is directly related to the hydraulic action, transmission efficiency and transmission accuracy, and also requires that the viscosity temperature performance and shear stability of the oil should meet the various needs of different uses.

There are many types of hydraulic fluids and different classification methods, and for a long time, it has been customary to classify them by use, but also according to the type of oil, chemical composition or flammability. These classification methods only reflect the earning of oil products, but they are not systematic and difficult to understand the interrelationship and development of oil products.

Quality requirements. The hydraulic system of automobiles and construction machinery uses hydraulic oil as the working medium, and the flow rate of oil in this hydraulic system is not large and the pressure is high, so it is called hydrostatic transmission. The quality of hydraulic oil will greatly affect the working reliability and service life of the hydraulic system. Generally, the quality requirements for hydraulic oil are as follows:

1) Appropriate viscosity and good viscosity temperature performance to ensure that the power can be transmitted accurately and sensitively under the condition of changing working temperature, and the normal lubrication of hydraulic components can be guaranteed.

2) It has good rust resistance and oxidation stability, is not easy to oxidize and deteriorate under high temperature and high pressure conditions, and has a long service life.

3) It has good foam resistance, so that the foam generated by the oil is easy to disappear under the working condition of continuous mechanical stirring, so as to stabilize the power transmission and avoid the accelerated oxidation of hydraulic oil.

Hello, there are too many brands of imported hydraulic oil, the brands of each country are different, the same, there will be many brands in a country, Mobil, Shell, Japan Idemitsu, etc., the general commonly used is the same as the domestic one, basically anti-wear hydraulic oil HM46, which can replace the German SHW-UFZ3 German hydraulic oil. It depends on where you apply it and what requirements you apply.

The landlord asked a clueless, there are many brands of imported hydraulic oil, there are more models, mainly Mobil and Shell, generally use 46 hydraulic oil, 32 can be used in cold areas, 68 can be used in high temperature areas, hydraulic oil and anti-wear, other types, specific to see in that kind of occasion, our equipment is used Shell Delux 46 anti-wear hydraulic oil.

There are many models of imported hydraulic oil, depending on what function you need.