Plug-in valve, 2-way plug-in valve
function of a 4-direction valve is replaced by four single valves that can now be operated, e.g. also with overlaps ( Figure Z 16 ). This procedure is cost effective because the same basic 2/2 unit can also [...] This is a 2/2- Directional valve that is designed for installation in a control block . If came about as a result of efforts to simplify controls by breaking down the functions of conventional directional [...] conventional means or using proportional valves. The circuit symbols are defined in DIN 24 342 data sheet 1.
Post-cure, overcure
1. Subsequent heat treatment (tempering) of certain elastomers whereby optimal characteristics do not emerge until the associated final linking occurs. 2. Unwelcome additional linking under the influence [...] influence of oil components (e.g. certain additives ) at a high temperature. This always leads to a deterioration in characteristics (e.g. things become brittle).
Pitot-static tube
(angled tube) and a static pressure probe. As such, it has an opening at the front (pressure point) and a round slot at the side ( Figure P 15 ). Separate lines divert both pressure elements towards the outside
Planetary motor
generated, which makes the planetary motor suitable for use at slow speeds. Planetary motors include the orbit motor and the MZK motor ( Figure P 10 ).
Corner frequency fE
to a 1st 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 [...] that the reduction in the amplitude of the output variable has reached 30 % of the input variable. At the same time is the time constant of such a system.
Pressure-limiting valve
therefore the most common design for the protection of systems. π/Q 2 behaviour of a pressure-limiting valve; 1. directly controlled, 2. pilot-controlled Pilot-controlled pressure-limiting valve [...] the pressure P exceeds the force of the valve spring, the valve cone/ball opens. However, the actual maximum pressure during operation is dependent on the respective flow (flow rate from P to T) and the [...] limit the inlet pressure by opening the outlet to the tank via the function element (which is closed at rest) on reaching the set pressure. This action occurs by opening against a closing force, which is
Pre-load pressure
1. Pressure intentionally generated by a resistance in a system (e.g. in the outlet line of a system). 2. Pressure to which the oil in a tank is subjected if the suction of the pump requires this. To that [...] that end, a rubber diaphragm absorbs the gas at 0.3 to 0.6 bar ( pre-charged oil tank).
Positioning error
(between 0.1% and 2 to 3%), errors resulting from friction in the drive, errors caused by the presence of an external load. They are dependent on the size of the load, the pressure gain at the valve and [...] the loop gain vK. All these errors are more or less cancelled out if appropriate measures are taken at the position control stage.
Closed centre system
On variable pumps with power limiting and pressure limitation set to minimum flow at pressure or On a variable pump with p/Q control system set to minimum flow with a different pressure above zero ( standby
Two edge control
1. Hydraulic resistance control for a displacement chamber with a type A hydraulic half bridge (adjustable input and output resistance); use of both control edges of a continuously adjustable 3/2-way [...] of the overlap/underlap conditions , only the control edges P A (inlet) and B T (outlet) or in the case of opposite directions of movement P B (inlet ) and A T (outlet) are active. This can be interpreted [...] valve with negative pressure. Together with a differential cylinder with an annular area pressurised at operating pressure (replacement circuit for hydraulic bridge D), the two edge control enables movement