Flow coefficient Kv (Kv value) of a valve
Defines the quantity of water in m3 (L) that flows through a valve in one hour (minute) with a pressure drop of 1 bar (VDI 2173). The Kv value is therefore a parameter for the selection of valve sizes
Pressure gauge
The pressure gauges used in fluid technology almost always operate indirectly via measuring devices with a spring, whose deflections are relayed to a pointer. In terms of the structure, a distinction is
Initial contamination
dirt is filtered out at the start by flushing the installation. For this purpose a flushing system with a dedicated pump and filters is often used.
Comparability
framework conditions. A prerequisite for such comparability for standardised processes is exact compliance with the standardised framework conditions, and for freely selectable test procedures is the accurate
Required filtration grade
defined by the manufacturer of the related device. These days this information is sometimes stated with figures in μm for the theoretically largest particle just allowed to pass (e.g. 10 μm or 25 μm). However
Measuring procedure (system)
required measuring accuracy (resolution, hysteresis), measuring range , upper and lower frequency limit (with , the measuring procedure must be faster than the controlled subsystem), electrical and mechanical
Acceleration measurement
majority of cases the acceleration is determined by differentiating the travel or the velocity, or with the aid of an observer.
Plunger circuit for fast advance
according to the ratio of the annular area to the piston area. In the case of differential cylinders with the ratio of piston areas of 2, the plunger circuit for fast advance takes on the operation of a
Partial flow filtration
the oil flow becomes very large at periodic intervals (e.g. in the case of feedback from cylinders with a large ratio of piston areas ), but the Filter should be small. It has the disadvantage that unfiltered
Cavitation erosion
surfaces as a result of cavitation causing vapour bubbles to form and collapse under certain conditions, with the surface of the material suffering mechanical stress if these collapse near or on the surface.