The Rotary Feeder / Star Valve: A Key Device for Conveying Bulk Materials

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The rotary feeder, also known as a star valve or airlock, is a crucial device for conveying bulk materials. It features a rotating impeller within a sealed housing, which evenly distributes and feeds materials from an upper hopper to a lower discharge point. Available in various types like electric, high-temperature, and wear-resistant models, it ensures airtightness and continuous, uniform feeding. Widely used in industries such as mining, chemical, and food processing, it prevents material leakage and maintains system efficiency.

The Rotary Feeder / Star Valve: A Key Device for Conveying Bulk Materials

The rotary feeder, also known as a star valve or airlock, is a key device for conveying bulk materials. Here is a detailed introduction:

 

I. Structural Composition

• Motor and Transmission Device: The motor provides power to the device, which is transmitted to the impeller through gears, sprockets, and other transmission devices, causing the impeller to rotate. 

• Seals: They ensure the sealing performance of the equipment, preventing material leakage and gas backflow, thereby improving the working efficiency and service life of the equipment. 

• Impeller: As the key component for material conveying, its structural design ensures that the material is evenly distributed in the gaps between the impeller blades and is smoothly conveyed with the rotation of the impeller.

• Rotor and Housing: The rotor, typically consisting of several blades, rotates within a cylindrical casing. The material falls from the upper hopper, fills the gaps between the blades, and is conveyed to the lower part for discharge. The housing serves to protect the internal components and ensure sealing.

• Pressure Equalization and Exhaust Port: Located on the side of the casing, this port discharges the high - pressure gas generated by the rotation of the impeller, reducing gas lift phenomena and facilitating the smooth descent of the material.

 

II. Working Principle

The rotary feeder operates by the transmission of a motor and reducer, which causes the impeller with equally divided structures to rotate within the casing. The material from the upper hopper or feeding device fills the cavities of the impeller. As the impeller rotates, the material is conveyed to the lower part of the casing and discharged, thus uniformly and continuously feeding material downstream according to the requirements of the conveying system. 

 

III. Types and Features

• Electric Rotary Feeder: Uses a motor as the driving device. It is mainly used for gravity feeding or pneumatic conveying systems of powdery and granular materials. It can provide uniform and quantitative feeding and can also be used as an airlock. It is generally made of stainless steel and carbon steel.

• High - Temperature Rotary Feeder: Used for conveying powdery and granular materials under high-temperature conditions. The maximum operating temperature can reach 500℃. It has higher requirements for the main body and seals of the rotary valve and is generally made of stainless steel.

• High-Pressure Rotary Feeder: Suitable for low - speed, high - pressure dense - phase pneumatic conveying of granular materials as a controllable feeding device. The valve body is designed with exhaust ports and anti - blocking features. The maximum operating pressure difference is 0.6 MPa, and the maximum operating temperature can reach 500℃. It is generally made of stainless steel.

• Anti - Blocking Rotary Feeder: Mainly used for gravity feeding and pneumatic conveying of granular materials. It is equipped with a special anti - blocking structure, such as a V - shaped inlet and chamfered blade tips, and an integrated valve body exhaust port.

• Wear - Resistant Rotary Feeder: Designed for conveying powdery and granular materials with high wear resistance. The inner wall of the valve body in contact with the material is coated with wear - resistant material.

• Sanitary Rotary Feeder: Widely used in food and pharmaceutical industries with high hygiene requirements. It has a polished surface up to #400, is easy to disassemble, and can be quickly cleaned to meet high hygiene standards.

 

IV. Application Fields

The rotary feeder is widely used in industries such as mining, chemical raw materials, plastic metallurgy, ports, grain processing, environmental protection, power, and cement. It is mainly used for ash discharge in dust removal equipment, air supply, and feeding processes in other equipment. It can prevent gas or dust leakage, ensure system airtightness, and achieve continuous and uniform feeding or discharging.

 

Star Valve,Rotary Feeder,Bulk Material

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