## 3 Results and Discussion
### Synthesis of Results  
\(\surd\)In most of the analyzed cases, the maximum airspeed was obtained in the space between the seat and the valve, this having the value of 3210 m/s for the S0-H2 case. For cases where the adjusting nozzle is at or below the seat, the variation in air velocity is relatively small. The calculated velocity difference between the extreme values is 150m/s for position S0 and approximately 160m/s for S-1.  
\(\surd\)For nozzle position S1, the air velocity varies significantly compared to the other two, with the minimum value being 2490 m/s for H1. At high fluidvelocity, the vortices created inside the valve body are much more pronounced, but the streamlines respect its geometric configuration.  
\(\surd\)In all analyzed cases, the extreme pressure values were obtained on the circular surface in the center of the plate. The highest value of the pressure is 4.3 MPa (air) and 4.31 MPa (water), being evenly distributed on the plate surface. In the case of the seat, the pressure drops with valve lift for all three positions of the adjusting nozzle except S-1-H3 (in air environment) and S0-H4 (in water environment).  
\(\surd\)The maximum values of the tangential stresses on the plate appear in most cases on the surface of the 0.4 mm chamfer, and in the case of the seat, they vary randomly on its surface. The maximum value of the tangential stresses on the plate is 0.0911 MPa (air) and 0.113 MPa (water), and in the case of the seat, the maximum values were obtained at H1, having a decreasing variation depending on the seat-valve distance.  
\(\surd\)In air environment, the turbulent kinetic energy has a random distribution over the surface of both the plate and the seat. In the case of the plate, the maximum value is 3660 kJ/kg and was obtained in the S-1-H2 configuration. In the case of the seat, the  
Figure 34: Multi-responseoptimizationplots in case of water environment: (**a**) “greater is better” for TKE, (**b**) “smaller is better” for TKE.  
turbulent kinetic energy has a relatively uniform variation for positions S1 and S-1, the highest value was obtained in the case of S0-H1, being 78.4 kJ/kg.
* In most of the analyzed cases, the maximum water speed was obtained in the space between the seat and the valve, this having the value of 112 m/s for the S0-H2 case. For cases where the adjusting nozzle is at or below the seat, the variation in water velocity is relatively small. The calculated difference between the extreme values is 5 m/s for the nozzle position S0 and about 6 m/s for S-1.
* In the case of nozzle position S1, the watervelocity varies significantly compared to the other two, with the minimum value being 87 m/s for H1. At high fluid velocity, the turbulence created inside the valve body is much more pronounced, but the streamlines follow its configuration.
* In case of water, the turbulent kinetic energy has a random distribution over the surface of both the plate and the seat. In the case of the plate, the maximum value is 5350 J/kg and was obtained in the S0-H2 situation. In the case of the seat, the turbulent kinetic energy has a relatively uniform variation for positions S0 and S-1, the highest value was obtained in the case of S1-H2 and is 479 J/kg.