Hydraulic motors subject to secondary control
Process to control the rotation speed by adjusting the torque with a reversible hydraulic motor in a system with impressed pressure ( constant pressure network ( Figure S 43 ). The rotation speed of the [...] Secondary control is therefore a pressure coupling with a flow reaction contrary to the conventional drive system, in which there is a flow coupling with pressure reaction. Important benefits of secondary [...] control should not be confused with the secondary adjustment of a gear, which designates a gear on the constant current network, in which a constant pump works together with a variable motor.
Twin pressure valve
Check valve with two blockable inflows and one outflow. The inflow with higher pressure is blocked, the other inflow is connected to the outflow. If both connections have the same pressure, both are connected
Programming languages
created with a view to compiling programs. Programming languages give a computer both the data to be processed and instructions as to how it should be processed. They formulate an algorithm with a fixed
Program carrier (memory, media)
wide range of options available. These include printed circuit boards with fixed programs, sequencers or program switching mechanisms with reprogrammable program carriers, a broad selection of semiconductor
Stepper motor-controlled proportional directional valve
Directional valve with a control piston (control spool) moved by an electrical stepper motor via a spindle-nut system. In doing so, each angle of the stepper motor is matched with a position of the control
Piezoresistive pressure sensor
distinction needs to be made here between: monolithic sensors with only one resistance bridge; sensors with temperature compensation; sensors with an output amplifier
Indirect measuring methods
other words, the output is expressed in variable values associated with another measured variable. Example: pressure measurement with pressure gauges or strain gauges whereby strain is actually measured [...] methods make it possible to read the measured value immediately and clearly using a simple device with an analogue or digital display.
Hand pump
pump — mostly with a single piston — for manual operation. It is single-acting in most cases, i.e. priming occurs during the first section of the cycle and delivery during the second. With double-acting
Conical piston
Pump piston with a spherical piston area which uses the piston rings provided for sealing purposes. The piston shaft — unlike the spherical piston — is conical in shape and is responsible for taking the [...] the Cardan-free cylinder drum with it (Figure K 4) .
HVLP oils
Short term for hydraulic oils with additives designed to provide protection against ageing, corrosion and wear and with viscosity improvement additives (Figure H 10) ; viscosity index: type 1: 125 to 190;