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Combination of two filters with a control unit so that the entire flow rate can be passed through one of the two filters while the other can be cleaned. (Figure D 32)

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

Detergent oils

Comprising individual elements, not contiguous. In control technology a process is discrete if it takes place in steps.

Covers especially the characteristics of discrete time systems and therefore goes beyond analogue, linear control theory . Digital control theory has become very important due to the possibilities off

The actuating force acts directly on the function element of the valve, i.e. on directional valves : The control spool is actuated directly by hand, by pressure or by a solenoid ; pressure valves : Th

Means working "with numbers". This signifies the representation of variables using an agreed set of characters that are assigned to the variable to be represented by a code . If the variable to be rep

Cylinder design that is equipped with several, mostly binary tiered pistons that can be operated in any combination. Therefore with n pistons 2n-1 positions are obtained with a positioning accuracy th

Pressure and flow valves with digital adjustment of the pressure and the flow rate by digital cylinders or by electrical stepper motors. While only a limited number of steps are allowed with cylinder

The speed ratio of a hydrostatic transmission is defined by the ratio of the pump speed n 1 to the motor speed n 2: