Planetary motor
motors which operate in accordance with the planetary principle. The distinguishing feature of planetary motors is how lots of displacement chambers are created with each revolution, which results in very
Binary
on/off, O/ L or 0/1. The binary numerical system has the base 2. With n binary signals it is possible to define 2n states. Therefore, e.g., with n = 8 = 28 there are 256 possible states. Binary technology forms
Corner power
M 2 · 2πn 2. On constant pumps and variable pumps with pressure controller the corner power is also the power to be installed. On variable pumps with power controller the system is always configured to
Fine control of flow
adjustable valves requires special measures on the control edges . In servo valves straight control edges with high precision are used (zero cut, (Figure F 7) ) that provide a linear opening stroke characteristic [...] However, a progressive characteristic is better for fine control of flow, as is achieved approximately with a chamfered edge. Triangular notches are even better; these provide a significantly better resolution
Pipe inductance
based on the mass inertia associated with the fluid. The following equation can be written for the change in flow rate dQ/dt, based on a given pressure difference Δp: With a pipe of length l and cross section
Copying attachment
response proportional valve . With single-axis copying, only the transverse axis is actuated hydraulically, while the longitudinal axis is actuated via the feed spindle. With double-axis copying, both axis
Centring by springs
The valve control spools on three way valves are, with the exception of very large nominal diameters, placed in the centre position and maintained there by two springs as soon as the solenoid force or [...] or the pilot pressure is zero (Figure F 3) . These springs define, along with the flow forces, the switching power (switching speed) of the valve. At the same time they are used to reset the outer switching
Passive sensor
Sensor which converts measured variables for analysable signals with the help of an external energy source. With passive sensors, electrical such as resistance, capacitance and inductance are modified
Surface filter
which only separates off impurities at the surface of the filter element. Surface filters are designed with pores (gap) of a similar size, which means they can retain certain sizes of particle almost completely [...] only have a small dirt holding capacity , which significantly reduces their service life compared with volume (bulk) filters . Surface filters are manufactured using thin fabric, mainly consisting of metal
Electro-hydraulic actuation
pilot valve is mostly directly on the main valve (Figure E 19) . With this combination it is also possible to control large valves with low electrical power (gain factor up to 105), which can be undertaken