Industrinės HL hidraulinės alyvos

Hidraulinės HL alyvos                                                               

Rūšis

Klampumas prie 40ºC, mm2 /s

Tankis, prie 15ºC, kg/m3

Pliūpsnio temperatūra PMCC, ºC

Stingimo temperatūra ºC,

Panaudojimas, savybės

Molylub CLW 3

Molylub CLW 5

Molylub CLW 7

Molylub CLW 10

Molylub CLW 15

Molylub CLW 22

Divinol GWA 32

Molylub CLW 46

Molylub CLW 68

Molylub CLW 100

Molylub CLW 150

Molylub CLW 220

Molylub CLW 320

Molylub CLW 460

3

5

7

10

15

22

32

46

68

100

150

220

320

460

815

825

840

850

855

865

870

875

880

880

890

900

900

910

120

130

140

165

165

190

205

215

220

220

225

230

230

250

-15

-15

-25

-25

-25

-20

-20

-15

-15

-15

-10

-10

-8

-8

Hidraulinės HL standarto alyvos.

Becinkė, kompozicinių priedų turinti, didelio atsparumo senėjimui, geros antikorozinės apsaugos, puikių krūvių pernešimo gebos guolių, špindelių (ISO 3-10), kai kurių hidraulikos sistemų ir silpnai apkrautų krumpliaratinių pavarų

cirkuliacinė - hidraulinė  alyva.

Geras atsparumas šalčiui ir demulgavimo savybės.

Specifikacijos: DIN 51517-2 CL , DIN 51524-1 HL/HLP (ISO 10-100); DIN 51517-3 CLP (150-460); VCL 100 DIN 51506; VBL DIN 51506 (220-460 klampumai).

Hidraulinės alyvos parinkimas pagal DIN HL standartą

Hidraulinių alyvų reikalavimai

HL oils are formulated for power transmission systems and for hydraulic steering systems. They are designed on the base of deeply refined, dewaxed and hydrorefined mineral oils received from crude oil refining. These oils contain a properly selected set of low-ash and ash-free additives that inhibit corrosion, oxidation and foaming, and improve lubrication and deemulsification.

HL hydraulic oils are suitable for use in medium-load power transmission and hydraulic steering systems.

Requirements for hydraulic liquids – especially in construction machinery:

  • Good lubrication properties
  • High resistance to aging
  • High wetting capacity and adhesive power
  • High flashpoint
  • Low pour point (lowest temperature at which oil is still liquid; e.g. -5 degrees Celsius)
  • Must not affect gaskets
  • Resin and acid free
  • Low influence of temperature on viscosity - both dynamic viscosity, which usually increases as the temperature rises, and kinematic viscosity (the relationship between the dynamic viscosity and the density)
  • Low compressibility

Hydraulic fluids are composed differently depending on the application and required properties:

Mineral oil-based

The most frequently used hydraulic liquid is mineral oil-based, with suitable additives. It is also known as hydraulic oil. The requirements for this hydraulic oil are set out in ISO 6743-4 with the designations HL, HM, HV. In Germany, the designations HL, HLP, HVLP are standard, in accordance with DIN 51524.

H and HH: Mineral oil with no active ingredients – is no longer used in practice.
HL: with active ingredients to increase the corrosion protection and resistance to aging
HM: with active ingredients to increase the corrosion protection and resistance to aging and to reduce wear due to scoring in the mixed friction area
HLP: further active ingredients in addition to HL oil to reduce wear and increase resistance in the mixed friction area – widest application in practice
HV and HVLP: like HLP, but with increased resistance to aging, as well as an improved temperature-viscosity relationship
HLPD: like HLP, but with additives to improve particle transport (detergent effect) and dispersion capacity (water carrying capacity) and active ingredients to increase the corrosion protection (German designation, not standardised)

Flame resistant fluids

HFAE: Oil in water emulsions

  • the water content is above 80% and is mixed with a mineral oil or soluble polyglycol-based concentrate
  • with a mineral-oil based concentrate, there is the risk of  separation and microbe growth
  • flame resistant, can be used at temperatures between +5°C and +55°C

HFAS: synthetic concentrates dissolved in water

  • no risk of separation, since this is a true solution, which means the hydraulic components are considerably more susceptible to corrosion

HFB: Water in oil emulsions

  • the water content is above 40% and is mixed with a mineral oil. This emulsion is rarely used.
  • flame resistant, can be used at temperatures between +5°C and +60°C.
  • In Germany, HFB fluids are not permitted due to the lack of fire protection properties

HFC: Water glycols

  • the water content is more than 35% in a polymer solution,
  • flame resistant, can be used at temperatures between -20°C and +60°C.
  • Can be used at pressures of 250 bar.

HFD: Synthetic liquids

  • HFD-R: phosphoric esters
  • HFD-S: anhydrous chlorinated hydrocarbons
  • HFD-T: mixture of HFD-R and HFD-S
  • HFD-U: anhydrous other composition (consisting of fatty acid esters)
  • Synthetic liquids have a higher density than mineral oil or water (not HFD-U), they can cause problems with the suction performance of pumps and affect a lot of gasket materials.
  • flame resistant, can be used at temperatures between -20°C and +150°C.

Biodegradable

Biodegradable hydraulic liquids are manufactured using plant oils (e.g. rapeseed oil) and used in biologically critical environments (construction machinery in water protection areas, snowgrooming equipment in mountains, etc.). The fluids are class 1 harmful substances.

Labelling : HE = Hydraulic Environmental

Classification:

  • HETG (triglyceride base = plant oils),
  • HEES (synthetic ester base),
  • HEPG (polyglycol base),
  • HEPR (other base liquids, primarily Poly-alpha-olefins).