How to Size a Rotary Airlock Valve

Correct sizing starts with material data and duty conditions, not only a flange size. This guide explains the basic data FUWEI uses to recommend a rotary airlock valve, rotary feeder or star unloader for powder handling and pneumatic conveying.

Sizing Data Needed

• Material name and bulk density
• Required capacity per hour
• Particle size, moisture and flowability
• Working temperature and pressure difference
• Inlet/outlet flange size, height limit and motor voltage

Capacity Logic

• Rotor pocket volume and filling efficiency decide theoretical discharge
• Rotor speed should stay within a stable range to avoid excessive leakage or product damage
• Fine powders and high pressure systems usually need tighter sealing and more conservative selection

When to Ask for Custom Sizing

• Existing valve dimensions do not match the required capacity
• Material is sticky, abrasive, fragile or high temperature
• The valve is used as an airlock in pneumatic conveying

FAQ

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Send your material data, capacity and operating conditions. FUWEI will help check the suitable rotary valve configuration.

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