Rotary Valve

A rotary valve is a type of control valve that is widely used in many different industries for bulk material handling processes. In simple terms, a rotary valve is a compact mechanical device employed for continuous release of granules or bulk materials. It is also known as a rotary airlock or rotary feeder whose primary function is to regulate material flow from one chamber to another and maintain a constant air pressure between the two ports (inlet and outlet). This is attained with the help of the rotor blades. It is a fundamental component in bulk handling systems. Many industries utilize this technology e.g., cement, food, plastics, agriculture etc.


A rotary valve is without a home until determined by its intended function. It can function as a feeder, an airlock or even as a combination (feeder-airlock) on pressure conveying systems.

Throughout the operation, the inlet port serves as the material entry point and the outlet port as the exit point. During this period, the rotors rotate about an axis (– these blades act as pockets, the space between the adjacent blades). The subject material is passed to each pocket through the inlet, then rotates inside the valve and then makes its way out through the outlet port. The rotation of the rotor shaft inside the housing is driven by an electrical motor. The motion inside the airlock valve occurs with restricted airflow because of the air sealed between the entry point and the exit point. Maintenance of the constant air pressure between the two points of the valve is crucial for proper functionality. The valve consistently supplies a definite amount of material at every discharge.

Rotary Airlock Rotary Valve


Usually, the rotary valve production obeys general practical engineering precisions. Material selection and dimensions are purely dependent on the device’s functional needs and the customer’s preference. Some of the components of a rotary valve include;


The motor and the gearbox are the drive system of a rotary valve. Most of the rotary valves are driven through a reduction gearbox that is powered by an electrically induced motor. The reduction gearbox is normally utilized to receive a specific motor speed and produce a low output speed. When assembling the system, the motor and gearbox can be mounted in several ways; gear driven (direct mounting of the gearbox to the rotor shaft) chain driven etc.


Polimak provides its customers with state-of-the-art accessories that help improve the already existing bulk solid handling equipment. Most of our accessories are available in different shapes and sizes so that their functions can be adopted to a wide range of equipment. Thanks to our engineering experts who actively work to find the best solutions for our customer. Polimak is capable of developing and manufacturing high-quality custom designed rotary valves and other necessary equipment. We design our products based on the specifics of each project and the objectives of our clients.


It is crucial for industries working with hazardous bulk materials to have ATEX certified equipment such as an ATEX certified rotary valve. All ATEX certified equipment is utilized with atmospheres having the possibility of explosion occurrence because of materials that are likely to ignite. ATEX certified rotary valve is utilized in industries that handle combustible clouds of dust such as those found in flour production, chemical processing etc.


Throughout the industrial sector, the use of a rotary valve is undeniable. Since its inception, its use in industries has progressively grown. Its utilization can range from food and pharmaceutical to agricultural and milling industries – nearly every industry out there makes use of it to its full capacity. The valve is designed according to the bulk materials it is meant to handle. Different types of bulk materials demand different valve designs. Coated surfaces that are non-stick or polished stainless-steel surfaces are commonly used for products having corrosive, sticky, and cohesive characteristics.