6 it is possible when turning off the voltage to reset the sealing device 6 by way of the bending element u2014 against the spring force part f b u2014 via the point of balance into the closed position the friction on the pivot bearings 7 of the sealing device 6 and on the points of application of the pressure spring 5 while it is possible to realize the pressure spring u2014 as shown in fig3 u2014 as a sheet metal bending part can be reduced on the sealing element 6 if these pivot bearings 7 and or points of application on the sealing device 6 are realized as cutting edges the friction between the bending element 1 and the sealing device 6 can also be reduced via cutting edges 9 or by way of another way of minimizing the surface roughness of at least one of the construction components 1 6 preferably of both construction components this can also be achieved for example by pushing a cap with a minimal surface roughness onto the bending element 1 the valves of both variants are represented in their simplest embodied examples with a valve seat 4 this means they are represented as 2 2 way valves however on the opposite side relative to the sealing device 3 with regard to the bending element 1 in fig1 and the side that is opposite relative to the valve seat 4 with regard to the pivot axis 7 in fig2 it is also possible to envision another embodied example of the two variants with a further valve seat in the latter instance the seat is preferably arranged in a plane that is rotated by 90 u00b0 relative to the first valve seat.