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Selecting Hydraulic Oil

2014-01-07

The mission of hydraulic oil: The most important task of the hydraulic oil transmission oil and hydraulic energy but also lubricates, reduces friction caused by movement of the components in the system, it this generated heat.

The mission of hydraulic oil : The most important task of the hydraulic oil transmission oil and hydraulic energy but also lubricates , reduces friction caused by movement of the components in the system , it this generated heat. In addition, hydraulic oil also has the task of removing solid particles , dirt and impurities from the system friction against corrosion .

Hydraulic Oil Requirements : Hydraulic oil firm Bestrol

• good lubricating properties ;

• Corrosion -resistant characteristics ;

• suitable viscosity ;

• Limit the corrosion ;

• Features foam gas well ;

• Prevent water well .

These liquids can be used in hydraulic

• hydraulic mineral oil .

• Water-based hydraulic oil .

• Oil mixed

• Liquid artificial .

Oil :

Hydraulic oil is the most common mineral oil

CETOP RP75H Type 4 includes the following groups :

• HH - no oil additives

• HL - oil has special additives to increase the life of the fluid and protect against corrosion .

• HM : " HL " + additives to increase corrosion resistance ;

• HV : " HM " + additives to increase the viscosity index .

However, the use of many different oils provide many benefits over just using a certain kind of difference , especially in the field of motorcycle construction ...

As ignition of hydraulic oil :

Some kind of hydraulic oil ignited difficult in normal conditions , are classified as " flammable liquid " . However, it should be noted that all hydraulic oils are burning in favorable conditions .

For water-based hydraulic oil , making the oil water feature Fire . In all cases the water evaporates , the remaining oil can burn. Among the synthetic hydraulic fluids fireproof , only phosphate esters are used .

Choosing the right kind of hydraulic oil with additives match is very important . For example, should choose oils to ensure favorable conditions for the operation and longevity of hydraulic equipment and oil itself is used in accordance with maintenance instructions .

Additives :

To enhance the physical and chemical properties of hydraulic oil , it added that the various additives .

Normally , people need to increase the following characteristics :

• Lubricate metal / metal contact points when operating at high speed and low speed .

• Oil viscosity changes only when using the oil in a small variation in temperature and high pressure . This characteristic is expressed through " The viscosity of a fluid " .

• The ability to mix low gas , released when the oil higher .

• The risk of oil bubbles when low .

• Resistant to corrosion .

• Toxicity and evaporate into the environment must be low .

The number and types of oil additives by decision makers and are often kept secret . However, information on the additives against wear and tear is usually published because this is very important in determining the working life of the system .

In view of Danfoss , the concept of oil include:

Or : 1.0 - 1.4 % Dialkylzincdithiophosphate - A trade name is the Lubrizol 677A )

Or : 1.0 - 1.6 % tricresylphosphate ( trade name : Lindol oil )

Or : 1.0 - 1.6 % triarylphosphate ( trade name Coalite0

Or : additives produced similar effects .

General Guidelines

All documentation used , the manufacturer will recommend different types of hydraulic oil in accordance with their respective models . The oils can be classified by both SAE and ISO . The hydraulic system on different machines in the same firm is also often recommended to use different types of hydraulic oil .

However, if you only rely on manual documentation is not sufficient . This is just the initial information . There are many other factors that affect the working conditions of hydraulic oil . Most influential factor is the ambient temperature . Thus , taking into account the influence of ambient temperature when selecting hydraulic fluids will ensure durability and ability to work effectively the device .

In the past 10 years , the hydraulic system has a lot of changes , smaller size , greater pressure ... And so , there is a kind of oil can not fit all the different applications .

One other notable point the user needs maintenance attention is hydraulics when the machine is out of date . Maintenance of hydraulic systems will lead to inefficient failures can be avoided during machine operation . Prevent , contamination and periodic hydraulic oil analysis will yield the best working conditions for hydraulic systems .

The most important characteristic of hydraulic oil affect the working process is viscosity . And the change in viscosity with temperature . When the temperature drops , the viscosity of hydraulic oil increases and vice versa . If the viscosity is too large can lead to oil pump can not push away the element of hydraulic system

Normally select hydraulic oil viscosity is lower than the manufacturer's suggested in the documentation used to increase surface contact between the large load . Using a higher viscosity oil can lead to overheating of the system and reduce the mobility of hydraulic oil

In addition , the viscosity abrasion resistance , anti- erosion of hydraulic oil is also of concern . The product information hydraulic oil not to mention two factors should determine the level of air abrasion and slip hydraulic oil should be asked directly to providers .

How to Choose a suitable hydraulic oil :

Typically , hydraulic oils are selected on two main factors : weather where the equipment used and the requirements of hydraulic components used in hydraulic transmission systems .

Viscosity: After selecting the category appropriate hydraulic oil , you need to select the viscosity of the oil level to suit the working temperature range of hydraulic equipment . According to ISO , the viscosity of the oil level indicator dynamic viscosity of the oil at 40 ° C.

For example , grade VG46 hydraulic oil kinematic viscosity ( kinematic viscosity ) is 46 cSt ( centistokes ) in temperature ( the oil ) 40 ° C.

There are many different quality requirements for hydraulic oil , but the most important of which is the oil viscosity does not change much with the change of temperature .

Selecting according hydraulic oil viscosity

- Sliding friction increases, generating heat and energy loss greater .

- Losses in oil circuit increases and the pressure loss also increase .

If you choose oil viscosity is too small ? ? ?

- Leak in pump will increase, volumetric efficiency and therefore not achieve a working pressure not meet requirements .

- Due to a leak inside of the control valve , the cylinder will be collected under the effect of the jet , and the motor can not produce enough torque on the axis of rotation required .

Selecting Hydraulic oil according to the geographical location where the appliance is working :

According to geographical location and weather of each region , we recommend the use of oil products as follows :

Tropics : temperate zone VG46 : VG32

Type VG68 only be used when the device work in environments characterized by high temperature air in continuous time .