Methods of valve installation
There are four basic types of valve installation: Pipe installation in which the valves are "suspended" in the pipe. This type is rarely used in hydraulics these days. Manifold mounting in which the v
Limiting conditions
Are characterised by the largest and smallest values for the individual variables with which the system is allowed to be operated with other influencing variables exactly defined and with the load dur
Thin foil element
A bistable element that acts as a memory and that uses a thin foil as a switching and sealing element that, as a consequence of the very low mass, permits switching times of 0.2 to 1 ms (Figure F 33)
Fluid friction
Friction in a hydrodynamic or hydrostatic load bearing, liquid or gaseous, continuous layer. In the hydrodynamic load-bearing layer, the pressure in the layer is produced by the movement of the bodies
Barrier medium seal
Non-contact seals (e.g. gap seals ) are not suitable for gases due to their lower viscosity unless they are combined appropriately with a liquid as a barrier medium ( Figure S 73 ). Depending on the d
Test pressure
Static pressure above the calculated pressure to check a device or system under defined conditions. There must be no long-lasting malformation, damage or incorrect functioning (DIN 24 311).
Frequency response for set input
Mathematical description of a follow up control in which, with the aid of the frequency response method, the transient response is determined (Figure F 36) .
Single quadrant operation
Operating modes of drives
Control plate
Disc-shaped or spherical functional element in axial piston machines , which has the task of reversing the rotating piston chambers from suction chambers to pressure chambers and vice versa ( Figure S
Hydraulic piloting stage
Another expression for hydrostatic amplifiers associated with servo valves .