Apex Valve for Starch Hydrocyclone | Discharge Control

Product Specifications

Technical details and manufacturing context for Apex Valve

Definition

The Apex Valve is a specialized component installed at the narrowest point (apex) of a starch hydrocyclone separation cone. Its primary function is to control the discharge of the concentrated starch slurry (underflow) that has been separated from lighter protein and fiber fractions within the hydrocyclone. By modulating the aperture at the apex outlet, the valve regulates the flow rate and pressure of the underflow, which directly influences the separation efficiency, product concentration, and the split ratio between underflow and overflow streams. The valve is available in various types, including needle, pinch, and diaphragm designs, and is constructed from materials suitable for food contact, such as 316L stainless steel, polyurethane, or ceramic. Key parameters include a nominal diameter of 25–80 mm (matching the hydrocyclone inlet size), an operating pressure of 1.0–1.6 MPa, a flow coefficient (Cv) of 2.5–12 m³/h at full opening, a seat leakage rate of ≤0.01% (Class VI shutoff), and an operating temperature range of 0–80°C (starch slurry may degrade above 80°C). The valve body is typically 316L stainless steel (ASTM A240), and the seat material is EPDM (FDA-approved for food contact). For rapid cycling, a pneumatic actuator is used, requiring a supply pressure of 0.4–0.6 MPa, with a response time of 0.2–0.5 seconds for full stroke and a repeatability of ±0.5% of stroke. The weight ranges from 5–15 kg depending on size and actuator. These values are directory reference ranges and must be confirmed for the specific model and application with the legal manufacturer or supplier. The Apex Valve is essential for maintaining continuous process flow and achieving desired starch concentration in starch refining operations.

Working Principle

The Apex Valve operates by adjusting its aperture to control the pressure and flow rate of the underflow discharge. In a starch hydrocyclone, feed slurry enters tangentially, creating a vortex. Centrifugal force separates denser starch granules towards the cone wall, which then travel downwards to the apex. The valve, often a needle, pinch, or diaphragm type, modulates the opening at the apex outlet. This controls the back-pressure within the cone, which directly influences the separation cut-point (particle size separation), the underflow density (starch concentration), and the split ratio between underflow and overflow streams. Precise adjustment is critical for maintaining separation efficiency and product quality.

Common Materials

Stainless Steel (e.g., 316L), Polyurethane, Ceramic

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	25–80 mm	Matches hydrocyclone inlet sizeISO 6708
Flow Coefficient (Cv)	2.5–12 m³/h	At full opening
Seat Leakage Rate	≤0.01 %	Class VI shutoffISO 5208
Operating Temperature	0–80 °C	Starch slurry may degrade above 80°C
Body Material	316L	Corrosion-resistant for food contactASTM A240
Seat Material	EPDM	FDA-approved for food contact
Actuator Type	Pneumatic	For rapid cycling
Supply Pressure	0.4–0.6 MPa	For pneumatic actuator
Response Time	0.2–0.5 s	Full stroke
Repeatability	±0.5 %	Of stroke
Weight	5–15 kg	Depends on size and actuator

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Valve Body / Housing Part
Forms the main structure and contains the slurry flow path, connecting to the hydrocyclone apex.

Material: Stainless Steel
Valve Seat Part
Provides a sealing surface for the valve plug/needle to create a tight shut-off.

Material: Polyurethane or Ceramic
Valve Plug / Needle Part
The moving part that adjusts the aperture size by moving relative to the seat to regulate flow.

Material: Stainless Steel with wear-resistant coating
Actuator (if automated)
Provides the force to position the valve plug (e.g., pneumatic cylinder, electric motor).

Material: Aluminum, Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Desander & Desilter

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Desanders/Desilters

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Manufacturers of Apex Valve

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Frequently Asked Questions

What is the primary function of the Apex Valve?

The Apex Valve controls the discharge of concentrated starch slurry from the apex of a starch hydrocyclone separation cone. It regulates the outflow to maintain separation efficiency and product concentration.

What materials are available for the Apex Valve?

The valve can be made from 316L stainless steel, polyurethane, or ceramic. The seat material is EPDM, which is FDA-approved for food contact. Confirm material suitability for your specific application with the manufacturer.

What are the key operating parameters?

Key parameters include a nominal diameter of 25–80 mm, operating pressure of 1.0–1.6 MPa, flow coefficient (Cv) of 2.5–12 m³/h, seat leakage rate ≤0.01%, and operating temperature 0–80°C. These are reference ranges; verify for your model.

How does the Apex Valve affect separation efficiency?

By adjusting the aperture, the valve controls back-pressure in the hydrocyclone, which influences the cut-point, underflow density, and split ratio. Proper adjustment is essential for optimal starch separation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 10 bar
flow rate:	0.5 to 50 m³/h
temperature:	5°C to 95°C
slurry concentration:	Up to 40% solids by weight

Apex Valve

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