Table 4 Effective design variables.

From: Multiobjective optimization of a pressure maintaining ball valve structure based on RSM and NSGA-II

Size code

Name

Range of values (mm)

D6

Valve body inner diameter

60 \(\le\) D6 \(\le\) 68

L2

Sealing surface height adjustment amount

25 \(\le\) L2 \(\le\) 45

L6

The height adjustment amount of the pressure-bearing surface

35 \(\le\) L6 \(\le\) 50