What is a rotary valve? Where is it used and with which materials?

What is a rotary valve? Rotary valves are known by a variety of names. Rotary airlocks and rotary feeders are the most common ones. The application of the valve gives rise to its name, whether a feeder, an airlock or even both. This article will concentrate on the word ‘rotary valve.

What is a rotary valve? A rotary valve is simply a mechanical equipment utilised for continuous discharge of dry solid materials. The term ‘rotary’ comes from the principle of operation of the valve. The vanes of the valve rotate to produce a successful operation during dry bulk material handling, hence the word ‘rotary’. In bulk handling industries, the valve is a necessary component. Its primary functions are to (i) regulate bulk material flow in the system and (ii) prevent air leakages, hence, maintaining constant air pressure in the system. The inlet port, which serves as the bulk material’s input point, and the outlet port, which serves as the bulk material’s exit point, are the two ports on the rotary valve. The bulk material enters the valve through the inlet and is carried across the valve’s housing surface to the outlet via the rotor pockets as the rotor shaft rotates. There are two types of rotations namely, the load side rotation and the return side rotation. The former is considered to be the rotation of the vanes and the pockets from the entry point to the exit point, while the latter is the rotation of the vanes and the pockets from the outlet to the inlet. Regardless of the valve’s simple construction, it is adjustable to meet most industrial applications. An incorrectly used valve can lead to inadequate efficiency, equipment wear, accelerated product degradation, production loss because of process shutdowns etc.

What is a rotary valve? Polimak offers an excellent variety of rotary valves to assist our customers with the efficient handling of bulk solid materials. We aim at designing and manufacture state-of-the-art rotary valves targeted at providing quality performance during bulk material handling. We provide valves that operate in industries such as food, chemical, agriculture, foundry, mining and aggregate and many others. Some of the bulk materials which are handled by our valves include cement, calcite, ash, glass powder, marble powder, plastic pellets, sawdust, fly ash, coal, coal dust, wheat, flour, barley, feed, seed, corn, chickpea, bean, soybean, sesame, rice, rice flour, dried fruit, nuts, peanut, almond, sunflower seed, cottonseed, grain cereals, chestnut, coffee grain, coffee powder, sugar, salt, spice etc.

A rotary valve is utilized in a variety of applications in the aforementioned industries. The valve is used in conjunction with other bulk solids handling equipment to achieve a certain goal. In industries, our rotary valves can be used in the following ways.

  • Empyting of silos.
  • Emptying of cyclones.
  • Dust collection systems.
  • Batching, mixing, and dosing systems.
  • Pneumatic conveying systems.
  • Conveyor feeding or discharging.
  • Screw feeder feeding and discharging.
  • Filling and emptying of bulk solids.
  • Feeding and discharging of bulk solid processing equipment.

Polimak offers a variety of rotary valve designs that can be used in a variety of industrial applications. With over four decades of industrial experience, we are always ready to provide solutions for your bulk handling by helping you select the right design and configuration to meet your specific application requirements.


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