Flow rate
Volume of fluid which flows through a cross-section in one time unit. In hydraulics the flow rate is generally stated in litres per minute (lpm). For example, filling a 10 litre water bucket at the ta
Drag indicator
Freely moving indicator on a pressure gauge , which has the task of displaying the maximum pressure incurred in a system. The drag indicator can be reset using a control knob.
Diesel effect
If mineral oil that contains air bubbles is compressed very quickly, the bubbles are heated so quickly that even self-ignition of the air-gas mixture can occur. As a consequence a very large increase
Axial piston pump
Axial piston pumps have several pistons that are arranged parallel to the drive shaft. They are available as either variable pumps or constant pumps. Axial piston variable pumps operate, for example,
Follow up control
On a follow up control the value for the controlled variable follows the changing value of the reference variable during the feedback control (DIN 19 226). The main task of the controller here is to a
Special gear pump
External gear pump with compensation of the radial and axial play to reduce the gaps with increasing pressure . This compensation is achieved by means of suitably shaped and arranged compression sprin
Pilot actuation
Pressure actuation of a (normally larger) valve using a suitable (normally small) valve, which is mechanically or electrically actuated.
Torque limitation
As on hydraulic motors the torque is proportional to the pressure the torque limitation on a hydraulic motor (hydrostatic transmission) is undertaken via the pressure-limiting valve in the system.
Dither signal
Squarewave AC signal from 70 to 400 Hz with low amplitude that is superimposed on the DC control voltage as "hum". The dither signal is used on continuously adjustable valves and has the task of placi
Flow/signal function
Flow rate-signal function