Rotary Airlock Valve Capacity Calculator

Historical Background

Rotary airlock valves, also known as rotary feeders, are integral components in bulk material handling systems. They were developed to regulate the flow of granular materials between different processing stages, providing both an airtight seal and metering capabilities.

Formula

The calculation for the rotary airlock valve capacity involves dividing the rate of conveying by the product density, then by the valve efficiency (expressed as a fraction), and finally by the rotor speed. The formula is:

\[ C = \frac{R}{D \cdot \left( \frac{E}{100} \right) \cdot S} \]

where:

• \( C \) is the rotary airlock valve capacity (volume),
• \( R \) is the rate of conveying (units per minute),
• \( D \) is the product density (units per volume),
• \( E \) is the valve efficiency (%),
• \( S \) is the rotor speed (RPM).

Example Calculation

Suppose a rotary airlock valve conveys material at a rate of 150 units/min, with a product density of 1.5 units/volume, an efficiency of 80%, and a rotor speed of 20 RPM. The capacity can be calculated as:

\[ C = \frac{150}{1.5 \cdot \left( \frac{80}{100} \right) \cdot 20} \approx 6.25 \text{ volume units} \]

Importance and Usage Scenarios

Accurately calculating rotary airlock valve capacity helps in selecting the appropriate valve for a material handling system, ensuring efficient and controlled flow. Proper sizing minimizes air leakage and material loss, and improves safety.

Common FAQs

What is a rotary airlock valve capacity?

• A rotary airlock valve capacity is the total amount of product that a rotary feeder can move through an opening per unit of time.

Why is valve efficiency considered?

• Valve efficiency determines how well the valve maintains an airtight seal, affecting the overall flow capacity.

What are the benefits of accurate valve capacity calculation?

• Accurately determining valve capacity optimizes material flow, minimizes leakage, and reduces energy consumption.