Actuating methods for valves
actuation (e.g. by hydraulic pilot pressure), combined actuation (e.g. by solenoid and pressure). With pressure actuation a differentiation must also be made between direct and indirect actuation.
Amplitude response
value of the circular frequency ω or against the logarithm of the circular frequency ω/ω o normalised with the natural angular frequency ω o and is called the amplitude plot (Figure A 14) (DIN 19 226).
Centrifugal pump
Pump where the increase in energy associated with a medium is largely dependent on the kinetic energy applied to it. For flow rate and pressure , it is a case of: where D = profile diameter, u = circu
Flow division
multiple consumers in a defined ratio from one pump: The most commonly used is the flow divider (valve) with two subflows. In the case of multiple subflows or greater accuracy rotary flow dividers are used.
Measuring amplifier
n or undergo further processing in a computer. A distinction is made between measuring amplifiers with carrier frequency for inductive sensors and DC amplifiers for active sensors, which produce their
Valve efficiency
comprised of form-related losses (form drag ratio) and throttle losses , are predominant for valves: with p A = system pressure. It is taken from the Δp -Q characteristic curve ( pressure loss/flow rate
Corner frequency fE
degree differential equation, the corner frequency is the intersection of the horizontal asymptote with the asymptote on the falling branch in a Bode diagram (see amplitude response ). At this point the
Grooved ring seal
used as two lip seals for sealing at the inner and outer ring (Figure N 9 a) or as a single-lip ring with an adhesive section for single-sided sealing. The sealing lip is arranged on the inside (b) or the
Equivalent bulk modulus
Takes into account along with the compressibility of the pressure fluid also the elasticity of the surrounding components as well as the connection line between the valve and . The equivalent bulk modulus
Pressure-flow (p-Q) control of a pump
system can be superimposed on a performance map of a pressure control system and in this way the losses with closed loads significantly reduced by operating the flow rate at a low pressure, the so-called standby