What type of impellor uses hydraulic balancing?

The type of impeller that uses hydraulic balancing is the single closed impeller. This design is characterized by having a shroud on one side, which allows for a balance between the pressures acting on the two sides of the impeller. The hydraulic balancing helps to minimize axial loads, which can lead to reduced wear and longer service life for the pump.

In a single closed configuration, the design naturally helps in equalizing the pressures on either side due to the closed side being able to trap some fluid, which stabilizes the forces acting on the impeller. This aspect of hydraulic balancing is critical in maintaining the efficiency and performance of pumps in various applications, particularly in preventing excessive thrust loads that can arise in high-pressure scenarios.

Other impeller types, like double open or double closed, do not focus on the same hydraulic balancing principles. Double closed impellers, while they can manage pressure differences, generally involve different dynamics and might not provide the same level of axial balance found in single closed designs. The single open impeller lacks a shroud, which means it does not provide the same pressure stabilization characteristics that a closed design does. Thus, the single closed impeller stands out for its ability to effectively utilize hydraulic balancing for improved operational stability.