DOUBLE VOLUTE D024
The double volute lowers the efficiency of the pump a small amount and therefore is seldom used on smaller size impellers.
- The radial force for a double volute casing is about 8% of the shut off value for the single volute casing.
- An advantage of this design is that the second volute adds strength to the casting and acts as a return channel if the pump is throttled too much.
- The direction of the small radial thrust in double volute casings is generally towards the casing cutwater.