Positioning error
the continuously adjustable valve is 100 % open. The positioning error therefore gets smaller as the K v-Factor gets larger.
Logic control
control system Entirety of input variables, e i Input variable influences that output variable a i; K i Combinational network to form output variables a i; A i Output variable; a Entirety of output variables
Compression energy EK
assume that a constant bulk modulus and isothermal compression apply. The result is as follows: where V K = Compression volume With gases, the compression energy is dependent on the thermodynamic change of
Positioning error
load. They are dependent on the size of the load, the pressure gain at the valve and the loop gain vK. All these errors are more or less cancelled out if appropriate measures are taken at the position control
Run up time constant To
control valve system. Based on ⅔ of the motor's rated speed, the run up time constant To for, say, a 50 kW axial piston motor would be around 0.2 s (the run up time constant To for an electric motor with the
Servo-hydraulique
techniques Pression de service p maxi : 320 bar Débit volumique Q maxi : 50 l/min Puissance assignée : 24,3 kW (par axe) Position de montage : à l'horizontale (module de vérin, module de réservoir) ou au choix [...] d'examen de type n° 13005). Caractéristiques techniques Force nominale par machine : 1 100 à 1 700 kN (avec deux ePRAX max) Vitesse rapide : jusqu'à 230 mm/s Précision de positionnement : 5 µm Course de [...] hydraulic power from an electric drive train Technical data Nominal force per machine: 1,100 to 2,500 kN (with two ePRAXs) Rapid speed: up to 230 mm/s Positioning accuracy: 5 µm Working stroke: 280 mm (standard)
Velocity of sound pressure waves
Velocity of the transmission of pressure in a fluid (speed of sound). It is dependent on the bulk modulus K of the medium and its density ρ: In air in the normal state it is 333 m/s. In mineral oil it is dependent
Releasable check valve
also be opened against the locking direction if required. This action occurs via a control piston (K 2) that is dimensioned so that it can open the valve cone against the system pressure. A distinction
Accumulator consumption diagram
size in order to replace the removed usable volume before the end of the working cycle: The factor k (approx. 1.25) serves to relieve the burden on the pump during part of the working cycle. Figure S 69:
Piston seal
These days, it is becoming increasingly common in hydraulics as well to use compact seals (Figure K 22) that provide a seal at both sides. Featuring vulcanised or inserted guide rings, these form complete