Initial sealing performance
action of the related seal shape at very low pressure. The initial sealing performance is increased with increasing pressure due to the automatic sealing .
Time-based workflow control
switching conditions depend only on time. For example, timer elements, time counters, gear shift drums with a constant rotation speed can be used to produce the switching conditions. The term timing control
Squeeze stress in seals
sealing surface and the compressive force are working in the same direction. The friction is higher than with a pulling load ( Figure S 83 ).
Damping coefficient d
Coefficient of a linear differential equation that describes the transfer function of a system with the parameters damped natural frequency and damping D as the result. d is determined from the measurement
Electric control power or force
actuate a valve . The control force reaches its maximum value at the full input signal and is zero with zero input signal. Here there is a device-specific dependency for the output variable, e.g. the flow
Pre-charge container
cylinders, for which there is no more pump for rapid traverse . The pre-charge container is refilled with the reflux oil after each stroke ( Figure V 38 ).
Spherical cone
Pump piston with a spherical piston surface, which contains piston rings for sealing. The piston shaft is lowered ( Figure S 75 ). The spherical piston is used in axial piston machines, in which the cylinder
Nominal force of a cylinder
friction losses, when the cylinder is operating at nominal pressure . As far as single-acting cylinders with spring return are concerned, the value for the start and end of the stroke must be specified.
Screw-in cartridge valve
the block into which the valve internals are screwed (e.g. on directional valves the valve sleeve with the valve control spool and the actuation) (Figure E 9) .
HLP oils
Short term for hydraulic oils with additives designed to provide protection against ageing, corrosion and wear. Used where increased wear is expected, as may be the case when high levels of pressure are