Solenoid
In fluid technology electro-mechanical used to actuate valves are often referred to as solenoids. These are not permanent magnets, but are electromagnets. An electrical input signal (voltage or current) [...] today apply a compressive force. The return to the initial position is generally via spring force. In fluid technology DC solenoids (voltage or current) and AC solenoids (voltage or current) are available as
Filtration efficiency in general
Ability of a filter to retain specific test contamination in a hydraulic fluid with a specified contamination concentration under defined test conditions (CETOP RP 100). As the test method for filtration
Oil sampling
comparison with others. Apart from absolute cleanliness for all devices coming into contact with the fluid to be sampled, these guidelines also stipulate the correct place for oil sampling, i.e. somewhere
Action of multiple resistance
As with electrics, a distinction is made in fluid technology between series and parallel resistances. For series circuits - as is the case for pipelines - the individual resistances are added ( series
Pressure amplifier
the transmission ratio of the pressure amplifier. It is possible to operate with the same pressure fluid and also with different pressure fluids (e.g. compressed air/ oil) in the two pressure systems.
Double acting cylinder
The cylinders have two line connections that are separate from each other. By feeding the hydraulic fluid through the two connections, the piston can transfer tensile and compressive forces in both stroke
Viscosity
Property of a fluid to act against resistance to the opposite laminar movements of two neighbouring layers (DIN 1342 and IDN 51 550). A distinction is made between dynamic viscosity and kinematic viscosity
Ramp
feedback control technology as a test function to determine the transfer behaviour of a system (). In >fluid technology, ramps are primarily integrated in the activation of> proportional valves in order to adapt
Bernoulli’s equation
between the velocity v, the pressure p and the geodetic height h in a flow. The energy of a flowing fluid: Etotal = E pot + E kin + E p = const. Potential energy = E pot = Δm · g · h Bernoulli’s equation
Concentrates
to give the water lubricity and corrosion protection. They usually make up 2 to 5% of a hydraulic fluid. A distinction is made between three groups: Emulsions : Concentrates based on mineral oil containing