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the drain if the pilot pressure exceeds a value defined by the adjusting spring. An unloading valve can also be used as a pump idle circulation valve .

Device, which brings about the programmed cycle of all control functions in cyclical sequence and can be connected via a bus line with all inputs, outputs, functional units and the program memory.

designed for defined applications, where neither standard cylinders nor series-production cylinders can be used. This includes, for example, press cylinders or cylinders with an adjustable stop.

for a measuring instrument or a machine as a result of external influences (e.g. temperature). It can be rectified by means of a null-adjustment signal.

"Blowing past" a piston seal. With large pressure gradients it can occur that the seal is not pressed against the sealing surface, instead it is pressed into the grove (Figure B 21) .

parts from which functional elements of a varying nature, e.g. cylinders or valves and also machines can be assembled.

Triggers the control process. It can be provided manually or by a process variable. In relation to its magnitude and its change over time, agreement is required in both cases (DIN 19 226).

length required for stimulation at a certain frequency, i.e. the length at which a stationary shaft can form in the element. The resonance length plays a role in creating the noise.

Each of the characters from a character set of two characters. Any character can be used as a binary character, e.g. O and L, Yes and No etc. (EDIN 44 300 Part 2).

Sound that propagates in a fluid medium. It can have been, but has not necessarily been generated in the fluid. The propagation velocity for mineral oil in steel pipes is approx. 1,300 m/s.