Depth of gash along the wall (vertically): 4.77 mm

Depth of gash along the wall (vertically): 4.77 mm

According to the invention, the depth of the recess (52) increases from the upper edge (54) of the interruption region (28), which faces the impeller (4), towards the inlet region (8).

The depth of the cut 'D' and the length 'L', the radius of the sphere, will determine the ratio of the respective weights of the complete half sphere (2) and the stem portion (3).