Rotary Airlock Valve

1. Overview

The Rotary Airlock Valve (Star Discharger / Star Valve) is a key auxiliary equipment for bulk solid handling, dust collection and pneumatic conveying systems. Different from flap valves for intermittent discharging and slide gate valves for pipeline cutoff, this equipment realizescontinuous quantitative discharging + reliable air locking simultaneously. The star-shaped impeller rotates cyclically inside the sealed housing, picking up materials from the top inlet and discharging them to the bottom outlet. It effectively blocks internal and external air cross-flow, maintains system negative pressure, and avoids dust leakage and pressure loss. It is the standard matching unit for silo hoppers, dust collector ash hoppers and screw conveyor feeding ports.

2. Working Principle

Material falls into the sealed valve body from the upper hopper inlet and fills the cavity between star impeller blades. The gear motor drives the impeller to rotate at a constant low speed. The filled material is carried downward and discharged from the bottom outlet by gravity. While the impeller rotates, the blade gap always forms a closed seal between the upper negative-pressure chamber and lower atmospheric pipeline. This structure prevents air backflow and pressure leakage, ensuring stable dust removal efficiency and consistent material feeding volume for downstream equipment.

3. Core Features & Advantages

- Dual Function: Air Lock + Continuous Discharging Maintains system pressure balance while delivering uniform material flow, cannot be replaced by flap valve or slide gate valve.

- Precision Quantitative Feeding Stepless speed regulation via VFD controls discharging volume accurately for automated batching systems.

- Excellent Sealing Performance Multi-layer shaft seal + precision fit blade gap, minimal air leakage rate for high negative pressure dust collectors.

- Anti-blocking & Anti-winding Design Optimized blade corner and anti-winding end cover prevent fiber and sticky material jamming.

- Wide Temperature Adaptation Standard type for normal temperature; heat-resistant type up to 280°C for hot ash and clinker.

- Multiple Body Options Cast iron, carbon steel and stainless steel 304/316 for corrosive and food-grade materials.

- Easy Maintenance Integrated split housing structure, convenient access for impeller cleaning and seal replacement without overall disassembly.

4. Main Technical Specifications

5. Application Industries

- Dust Removal & Environmental Protection Continuous ash discharge for bag filter and cyclone dust collector hoppers

- Thermal Power Plant Fly ash silo discharge, boiler ash quantitative feeding conveying system

- Cement & Building Materials Raw meal, cement powder and limestone granular material feeding

- Chemical & Plastic Industry Corrosive powder and pellet material sealed dosing

- Grain & Food Processing Stainless steel sanitary star discharger for grain and feed conveying

6. Customization Service

We provide professional customized rotary airlock valve solutions. Customizable options include flange size, inlet/outlet shape, heat-resistant configuration, stainless steel anti-corrosion body, anti-welding impeller, air purge sealing system, explosion-proof drive and variable frequency speed control. All valves undergo air tightness and no-load testing before delivery, with complete installation manuals, field commissioning guidance and lifelong spare parts support.