| 摘要 |
The pump has rotary pistons for delivering fluid medium, and a surface layer fastened as a piston head (10) in the pistons, where the piston head is made of polymer e.g. elastomer. The piston head is mounted in a base of the pistons in a removable manner. A screw nut (15) is locked in the piston head and cooperates with a mounting bolt (14). A head (13) of the mounting bolt is arranged in a radial recess (12) of the base of the pistons and contacts with the screw nut, where the radial recess is open at a rotary piston shaft. |
