Abstract: To improve the surface finish of the inner circumferential surfaces of the stator and to reduce the manufacturing effort, it is proposed that the stator with a stator housing 1 and with the stator blades 13 have a two-part design and to insert the stator blade 13 into the stator housing 5 in such a way that they rotate in unison. In terms of the process, it is proposed that a commercially available tube with an inner circumferential surface suitable for use as a sealing surface be used and that longitudinally extending joining means be prepared. The stator blades 13 manufactured as an individual part receive corresponding joining means, so that the stator housing 5 and the stator blades 13 are welded, clamped or screwed together.