Fatigue strength
Fluid devices and systems are always given a load from zero to the maximum, i.e. they are subject to a pulsating load. Therefore, either the fatigue strength under fluctuating stress or the fatigue limit
Control 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 valves
Pressure ratings
DIN 24 312 and DIN 2401 contain a summary of the pressure ratings used in the area of fluid technology as well as the preferred pressure values in this area. The ratings should be used, as far as possible
Flow machines
which work according to the hydrodynamic principle, i.e. in which the velocity element of the flowing fluid is decisive. For pumps, these are the centrifugal pumps and the turbines, hydrodynamic (Foettinger)
Polymer materials
molecular units (blocks). Their number determines the level of polymerisation. The materials used in fluid technology in terms of elastic materials for seals such as rubber, thermoplastic elastomers and t
Rapeseed oil
Biologically degradable, i.e. environmentally-friendly hydraulic fluid. based on natural base oils. Besides the desired environmentally-friendly properties, rapeseed oil displays properties such as poor
Operating pressure
The operating pressure corresponds to the actual pressure (DIN 24 312). See also pressure ranges in fluid technology.
Release valve
until the pressure in the chamber has dropped to a specific value (see Energy content of hydraulic fluid ).
Solenoid
In fluid technology electro-mechanical used to actuate valves are often referred to as solenoids. These are not permanent magnets, but are electromagnets. An electrical input signal (voltage or current) [...] today apply a compressive force. The return to the initial position is generally via spring force. In fluid technology DC solenoids (voltage or current) and AC solenoids (voltage or current) are available as
Blowing past piston seals
seal of a double acting hydraulic cylinder, in the case of a poorly designed piston seal, pressure fluid can flow from one side of the piston to another in a short time, normally if very rapid pressure changes