form although the above mentioned further densification at high temperature while under pressure must also be used in this case of course other conductive ceramic materials besides al 2 o 3 and tic can also be used other examples are sic with free si or sic with tib the following general rule applies to electrical resistance the smaller the electrical resistance the less the component will be electrically charged and accumulate dirt as a result of static electricity in a further embodiment of the invention the valve has substantially the same design as shown in fig1 and 2 but the valve ball and the valve seat are made of electrically conductive glass instead of electrically conductive ceramics such valves of electrically conductive glass have substantially the same advantages as those made of conductive ceramics see above an example for electrically conductive glass is the glass sold by the company schott under the name 34 s 8900 34 the glass is doped with iron ions fe 2 and fe 3 ions as an alternative to the ball valve design a design with a plate and a hole manufactured from conductive glass can be used the use of glass material allows to apply alternative manufacturing processes such as etching processes furthermore smaller dimensions of the sealing components can be achieved with the glass technology according to a still further embodiment of the invention the material for the valve ball and the valve seat is a substantially non conductive ceramic or glass material which is covered at the surface by a layer of electrically conductive material an example for such an electrically conductive material is gold the gold.