Objet de la recherche «fluides».

To monitor the state of a hydraulic fluid there are three variations, each with a different information value: Visual inspection : The colour of a pressure fluid (in particular mineral oil) is a measure [...] measure of its ageing. However, this is very inaccurate, as a black discolouration of the fluid alone does not necessarily affect its usability in any way. Quick analysis in operations : Ongoing control using

Cleanliness level

Fire-resistant fluids based on a solution of polymers (polyglycols) in water at a ratio of around 60:40. HFC pressure fluids have a viscosity of 30 to 45 mm2/s at 50°C and may be used instead of mineral [...] Sole restriction: roller bearings have a shorter lifetime given the water content of HFC pressure fluids and the working temperature is limited to a range between –20°C and +60°C. The water content must

The overall costs for a plant consist of the procurement costs A, ( Figure K 33 ) and operating costs K, which can fluctuate considerably in the field of hydraulics. They will depend primarily on over

In order for the hydraulic fluid to deliver sufficient lubricating effect in plain bearings and under seals , it must have sufficient wetting ability. This is generally the case with HLPD oils .

also only makes itself apparent where the mass forces of the flowing column of fluid have an effect. As hydraulic fluids are in reality not incompressible, but are compressible, in addition to the energy [...] The basis is Bernoulli's equation for ideal, incompressible fluids: = static pressure + dynamic pressure + geodetic pressure. This equation yields the related energy element as The last term ρ · g · h

Device that measures and displays the liquid level in a tank.

hydraulic fluid on motors is from the exterior onto the piston (Figure A 11) . The control on pumps is automatic using suction valves and on motors using control discs or rollers. Opposite: internal fluid admission

Water-free, synthetically produced fire-resistant fluids. They rely on the following compounds: Phosphoric ester (HFD R), currently the most widely used HFD fluid; performs worst in terms of fire resistance [...] environmental protection. Mixtures of HFD R and HFD S. Other compositions (HFD U). Common to All HFD fluids is the lack of compatibility with most materials for seals and a high density of 1.15 to 1.4 g/cm3

Refers to the supply and discharge of the pressure fluid in pumps/motors through the inside of the displacement unit. For example, with valve plate controlled radial piston machines where the pistons are