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In order for the hydraulic fluid to deliver sufficient lubricating effect in plain bearings and under seals , it must have sufficient wetting ability. This is generally the case with HLPD oils .

The basis is Bernoulli's equation for ideal, incompressible fluids: = static pressure + dynamic pressure + geodetic pressure. This equation yields the related energy element as The last term ρ · g · h

Filter element that withstands a differential pressure that is at least as large as the nominal pressure of the system, without damage occurring to its structure or the filter material.

Printed circuit board (PCB) with electronic controller - at European manufacturers mostly in the eurocard format - that is used to control a proportional valve or servo valve. The control card is most

Bistable switching element in which the switching state last used is retained also after the removal of the input signal (memory action).

Measuring system in which the information on the actual (absolute) position is always available. For this purpose the sensor (e.g. glass measuring scale) must provide additional information. This info

Feature that on some adjusting features on pumps, e.g. power controllers, reduces or limits the pump delivery flow on reaching an upper adjustable pressure to prevent the pressure-limiting valve trigg

In general : Valve with three controlled ports. For directional valves : Valve with inlet, cylinder line, outlet (suitable to control a single action cylinder).

Ratio of the output power to the input power of a system or device ( total efficiency in the case of hydraulic devices).

Devices, which control a power flow. In fluid technology these are the valves, which influence the flow rate in terms of direction ( directional valves ), size ( flow valves ) and pressure ( pressure