1) The radial jump of single-stage pump shaft is not more than 0.05 mm, and that of multi-stage pump shaft is not more than 0.05-0.085 mm.

2) Shaft end runout is less than 0.1 mm.

3) Verticality of end face and shaft of seal cavity is less than 0.1 mm.

4) The axial series momentum of the pump shaft is not greater than (+1 mm). (Special requirements are designed according to actual conditions)