Release valve
Controlled valve that opens to the outlet and as a rule has the task of allowing the compression volume to escape in a controlled manner until the pressure in the chamber has dropped to a specific val
Energy losses in hydraulics
In every hydraulic system there are energy losses in the form of pressure and leakage losses in varying degrees. A differentiation is made between (Figure E 31) : pressure losses in lines due to frict
Electro-hydraulic control technology
Collective term for all hydraulic feedback controls with electrical (electronic) signal processing. As the to the hydraulics - the servo valves and proportional valves - has already been in use for so
Valve pressure difference
In the case of the directional valves this is the pressure difference between the pressure and tank connection of the valve in the case of short-circuited operating ports A and B of the valve. In the
Valve seals
Valve tappets which are guided outwards must be sealed off. This is generally done using nut rings or O-rings.
Valve actuation
For fluid valves there are a number of actuation types: Manual actuation: Actuation using a hand or foot (including manual override). Mechanical actuation using levers, plungers and/or rollers and spr
Submerged motor
Electrical drive motor for pumps, which is installed beneath oil in the tank and therefore does not require a closed housing or whose housing also performs the tank function, particularly in the case
Subordinate control circuit
that feeds back a further control variable (e.g. acceleration or pressure) alongside the primary control circuit. The subordinate control circuit is introduced if the feedback of the actual value does
Underpressure
Previous term for pressures beneath the atmospheric pressure. According to DIN 1314, underpressure should no longer be used to name a variable, but only for the qualitative description of a state. As
Discontinuous controllers
(Discrete) controller , in which the controller output signal is discontinuous despite a continuous input signal (switching controller) Examples: 2-point or 3-point controller (DIN 19 225).