Rotary Valves
The solution for efficient and controlled handling of your bulk materials.
About company
Rotary Valves
The solution for efficient and controlled handling of your bulk materials.
About company
Rotary Valves
The solution for efficient and controlled handling of your bulk materials.
About company
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WHO WE ARE

Polimak is a solution provider to your bulk material handling processes with over four decades of experience in the industry of bulk solid handling. We aim at designing and manufacturing the state-of-the-art rotary valves targeted at providing quality performance during bulk material processing. We have passionate and talented experts to deliver exceptional, efficient, and value-driven solutions for our customers in the bulk solids processing industry.

OUR ROTORS

We offer different types of valve rotors for various material handling processes. These rotors are available in a variety of configurations including, varying rotor pocket number, tips etc., for improved material flow.

HANDLED MATERIALS

Having been in the bulk solids processing industry for over 40 years, we have seen and provided solution to customers handling various types of bulk materials. Our sales team, design engineering team and the production team work tirelessly to provide the best solutions for our customers regardless of the bulk materials being processed.
Sand
Sand
Wood Chips
Wood Chips
flour
Flour
Sugar
Sugar
chemicals
Chemicals
microplastics
Plastic Pellets​
Cereal Grains
Cereal Grains
coal
Coal
coffee beans
Coffee Beans
cement
Cement

HOW A ROTARY VALVE WORKS

There are a number of different names used to refer to rotary valves – rotary feeders or rotary airlocks. These names technically refer to a similar mechanical device with regards to its design and appearance. The valve can function as a combination of the two (feeder and airlock), hence, the name airlock feeder. During operation, the bulk material goes in through the valve's inlet and is transported across its housing surface to the outlet by means of 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. The valve can precisely discharge and feed powder or granular bulk materials from hoppers or silos. A rotary valve can operate as a rotary airlock feeder in situations where pressure differentials are present, situations such as pneumatic operating lines. This implies that the airlock feeder can allow material flow while reducing air leakages. Its blades form a slight seal against the housing surface; hence, reducing air leakages.