A rotary airlock valve is a type of rotary valve used in pneumatic conveying systems to control the flow of material or air between two chambers while maintaining a seal. The rotary design uses vanes or blades rotating inside a housing to allow material to pass through while preventing air leakage. This type of valve is commonly used in industries such as food processing, pharmaceuticals, plastics, and agriculture to ensure efficient and reliable transfer of materials without contamination or blockages.