Filter installation
undertaken in the secondary flow (f) , as a separate circuit is selected in which a pump presses the fluid through the filter independent of the working cycle, as well as mostly through a cooler .
Bulk modulus
Parameter for the volume elasticity of a fluid, comparable to the modulus of elasticity of solid substances. Unlike the modulus of elasticity, however, the (genuine) bulk modulus is not a constant value
Hydraulic accumulator
Accumulator which stores a fluid under pressure and is therefore able to release hydraulic energy. Pressurisation is mainly based on gas pressure (air, nitrogen, " hydropneumatic accumulator ") and, more [...] withdrawal of the volume. With hydropneumatic accumulators and spring accumulators by contrast, the fluid pressure decreases - due to the element applying the load expanding - as the spring characteristic
Compression volume ΔVK
Volume which must also be compressed into a space due to the compressibility of a fluid in order to generate a specific pressure there: where V o = volume under pressure, Δ p = pressure increase in the
Thermoplastics
Teflon) has extremely low friction and has excellent chemical resistant strength (even against HFD fluids ) and very high temperature resistance from –270° to +260° C. PTFE is used in seals with an elastomer
Pump control
Measure of speed control, in which the variable pumps are used, which only deliver as much hydraulic fluid as required in the circuit. This keeps the power loss smaller than the control with throttle . However
Oscilloscope
ly those involving oscillation. The following distinction is made in terms of functionality: The fluid-jet oscilloscope, which uses a nib or ink jet to write on graph paper and is suitable for processes
State controller
can be introduced by status monitors . In the case of the closed loop position control systems in fluid technology it has been shown that a combined feedback of the velocity and acceleration produces the
Orifice
outside the geometric cross-section constriction. As in these types of flow resistances the viscous fluid friction is very low, the flow rate is dependent on the pressure difference and not the viscosity
Elastomers
range between -20° and +100°C. FKM (fluorinated rubber) has high resistance to mineral oil and HFD fluids even at high temperatures (up to 200°C). FVMQ (fluorosilicone rubber) can be used over a very high