Underflow Apex

The Underflow Apex is a critical conical component located at the narrow bottom outlet of a Continuous Starch Hydrocyclone Separator. Its primary function is to collect and discharge the denser starch slurry, known as the underflow, which has been separated from the lighter overflow stream through centrifugal forces. The precise geometry of the apex controls the separation efficiency and the discharge rate of concentrated starch particles. The component is designed to maintain a constricted outlet that sustains the necessary pressure differential within the hydrocyclone, forcing the denser particles that have migrated to the outer wall to exit as a concentrated underflow stream while preventing short-circuiting of the feed. The Underflow Apex is available in materials such as polyurethane, ceramic, and stainless steel, with stainless steel 316L specified for food contact applications. Key parameters include an inlet diameter of 50–150 mm, an underflow opening diameter of 10–50 mm, a cone angle of 10–20°, a capacity of 10–100 m³/h, an operating pressure of 1.0–1.6 MPa, an operating temperature of -10 to 80°C, a surface roughness of 0.8–1.6 µm Ra (per ISO 4287), a weight of 15–60 kg, and connection types DN50–DN150 (per EN 1092-1). These values are reference ranges and must be verified for the specific model and application. The component is used in food manufacturing, particularly in starch processing, where hygiene and precise flow control are essential. Proper selection requires matching the inlet diameter to upstream piping and flow rate, and the underflow opening diameter to the desired underflow concentration and flow. The cone angle affects separation efficiency and wear. Operating pressure must be maintained within the specified range. The surface finish is smooth for hygiene and flow. Regular inspection for wear, especially in abrasive starch slurries, is recommended. The Underflow Apex is a replacement part; its lifespan depends on operating conditions and material selection. Always consult the legal manufacturer or supplier to confirm model-specific values and standards.

The Underflow Apex creates a constricted outlet that maintains the necessary pressure differential within the hydrocyclone. This forces the denser starch particles, which have migrated to the outer wall and descended, to exit as a concentrated underflow stream, while preventing short-circuiting of the feed. The geometry of the apex, including its cone angle and opening diameter, directly influences the separation efficiency and the discharge rate of the concentrated starch particles.