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also provided by CETOP and VDMA, and there are VDI guidelines too. A very comprehensive collection can be found in "O+P Konstruktions-Jahrbuch 1993/1994" [O+P Design Manual 1993/1994] published by Vereinigte

different pressures. To prevent leakage either the gap must be designed such that no pressure flow can be produced ( gap seal ) or special elements are used, the seals. If it is necessary to seal against

dropped to a predetermined pressure ( Figure S 67 ). A good accumulator system should ensure the pump can be switched on and off exactly under the preselected pressures, have a small pressure switching difference

pressure. Supply pumps are used for this, which are used in open or closed circuits (however, here they can be kept significantly smaller than " flushing pumps ").

have also been proven in heavy duty applications. As the fabric seals are very stiff, difficulties can arise at low pressures. In such cases often only a bearing surface made of fabric is used (Figure G

of complaints with predetermined values, ranges or switching states. The variables to be monitored can be measured directly or may be the result of an evaluation (DIN 19 222). This monitoring may take the

shows that between 4,000 and 8,000 parts more than 5μm and between 500 and 1,000 parts more than 15 μm can be contained in 100 ml of liquid ( contamination classes ).

apply or the related value for the measured variable must be stated. In particular a differentiation can be made between initial sensitivity and the sensitivity at the end (DIN 1319). In a measuring chain

of a DC motor as an analogue setpoint generator, an external speed control circuit is required that can be avoided on the usage of a digitally operated stepper motor.

force). The force exercised by the flow on the environment is the flow force This Bernoulli force can be seen, for example, with directional valves where, during opening, it exercises an opposing force