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needed if a pulling load is present at a hydraulic motor in an open circuit. Since what had been the pressure line then becomes the suction line, the servo-suction valve is intended to prevent a vacuu

Measure of the stability of a hydraulic system. Whatever applies to this also applies to general natural frequency . With hydraulic drives, it is more or less equivalent to the natural angular frequen

Measures for fault detection, fault localisation and fault indication. This can be achieved by the provision of state signals to the machine controls that, by means of comparison with the setpoints ,

Device in which the operation pressure p 1 of the primary pressure system is brought to a higher pressure p 2 in the secondary system. The pressure boost factor is given by the ratio of the primary an

Measurement for the acid content of a mineral oil . It indicates how many mg of potassium hydroxide are needed to neutralise in 1 g of oil the free acids generated during operation. Since the acid con

A transfer element is associated with non-linear behaviour if the relationship between the output and input signal cannot be described by a linear differential equation. Non-linear signal transmitters

Information on the operating viscosity characterises the viscosity range in which the entire system can operate. A differentiation is made between three key figures: Maximum start viscosity : Characte

Centre position

Valve which is closed in the rest position and opened when the flow rate is actuated. Opposite: normally open valve .

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