| 摘要 |
An illustrative method for operating a valve that includes at least one valve seat, a valve plunger and a stepper motor for moving the valve plunger from a first position into a second position in which the valve plunger is pressed against a valve seat and for compressing a flexible element assigned to the valve plunger in said second position, whereby the stepper motor may be driven in such a way that the stepper motor provides a defined number of steps (NTOTAL) in order to move the valve plunger into the second position and to compress the flexible element, wherein the stepper motor is driven is such a way that for a first number of steps (N1) of said defined number of steps (NTOTAL) the stepper motor is operated at a first current level (I1); for a subsequent second number (N2) of steps of said defined number of steps (NTOTAL) the stepper motor is operated at a second current level (I2) being lower than the first current level (I1); for a subsequent third number of steps (N3) of said defined number of steps (NTOTAL) the stepper motor is operated at a third current (I3) level being higher than the second current level (I2). |
