Scraper
Valve that can shut-off the flow in both directions. In fluid technology this valve is implemented in then form of a seated or ball valve. One of the most important sources of contamination in hydraulic
Seal leakage
areas to be sealed, the shape and hardness of the seal and the durability of the medium. The film of fluid on the wall associated with the escape lifts the sealing lip and therefore remains on the surface
Hydraulic drive systems
hydraulic energy is in general produced by hydraulic pumps, the conducting section, comprising and fluid power control devices (control elements) and the motor section in which the hydraulic energy is converted
Tank
Vessel for collecting and to some extent conditioning hydraulic fluid (removal of contamination and air, quietening). Is used at the same time to remove dissipated heat , however it is only suitable for
Flow in pipelines
= 1.2*v m . As of a certain flow speed, which depends on the pipe diameter and the viscosity, the fluid becomes heavily swirled (turbulent) and this results in a high energy loss. This flow should generally [...] depends on the Reynolds number . As the formation of a laminar flow requires a build-up distance of the fluid flow pattern l a = 0.03 d i · R e (for example 20 mm internal pipe diameter approx. 1.3 m) compared
Pipe capacity
accommodated based on the pressure increase required. It is a function of the compressibility of the fluid. The compressibility of the oil in a pipe is increased by the elasticity of the walls and any undissolved
Contact seals
the pressure of the medium (elastomer seals). These sealing elements are predominantly elastic in fluid technology and made of elastomers or thermoplastics (materials for seals). In addition metal seals
Open loop control system
series circuit) of several subsystems: For example, one subsystem is the plant to be influenced, in fluid technology this is often a cylinder with a connected load, the second subsystem is the immediately
External gear pump
gear wheels with teeth on the outside that rotate engaged in each other. As a result the hydraulic fluid is pressed out of the gaps between the teeth on the outlet side, while the necessary vacuum is produced
Filter size
atmosphere in which the system is operating, The permissible pressure drop The viscosity of the hydraulic fluid and thus its temperature at that moment For the selection of the size the figures are available from