Three distinct rotary valve models (flow-through, blow-through and off-set) are produced by Polimak, each suitable for various applications. Our rotary valve design variation provides our customer with a broad model selection for handling different dry bulk materials with different properties. These valve models can be designed with different rotary valve drive connection configurations. Polimak rotary valve models come with the assurance of decades of experience, great know-how, as well as high-quality materials used in manufacturing.
End-plates construction materials: cast iron, stainless steel, hardox, carbon steel.
Housing construction materials: cast iron, stainless steel, hardox, carbon steel.
Rotor construction materials: cast iron, stainless steel, hardox, carbon steel.
Seals: Lip seal, Gland packing.
Rotary valve drive connections designed and manufactured by Polimak come in three different variations, the worm gear reducer connection, direct coupling connection and the chain drive connection. These drive connections are implemented to a rotary valve through a rotary valve rotor.
The main component in a direct coupling drive connection is a coupling, also referred to as a shaft coupling. Shaft couplings are designed to transmit torque between a driving shaft and a driven shaft. They consist of two hubs, one fixed at the end of each rotating shaft. Torque is transmitted through these hubs. An electric drive motor and a driven machine (rotary valve) are directly connected using a shaft coupling. The coupling cannot reduce the motor’s rotating speed and for this reason, a worm gear reducer is used to ensure low-speed output. A direct coupling drive connection offers some of the following benefits; the absorption of mounting errors (shaft misalignment), vibration absorption during operation etc.
A drive system or sometimes called drive connection refers to a type of system or connection driving a machine during its operational duration.
A shaft coupling is a mechanical device that connects two rotating shafts for torque transmission from a driving shaft to a driven shaft.
A worm gear consists of a shaft with spiral threads known as a worm and a toothed wheel known as a worm wheel (spur gear). A worm gear reducer is formed when the threads of a worm perpendicularly align to fit the teeth of a worm wheel. Torque is applied to the gear assembly via a worm pinion. As an electric motor applies a rotation force to the assembly, the worm’s threads push against the teeth of the worm wheel causing it to rotate. The rotation of the worm wheel applies a torque to the driven which turns at a speed related to the reduction ratio of the gear assembly.
A rotary valve rotor is a rotating component of a rotary valve and is primarily used for controlling the bulk material flow from upstream equipment to downstream equipment. The rotation of the valve rotor is powered by a drive motor connected to it – various rotary valve drive connection are available.
Polimak offers two fundamental designs of rotary valve rotors (open end rotor and closed end rotor) commonly used in most industrial applications. We also render various rotary valve rotor types with modified features to help improve the performance during operation. The optimal rotor design is determined by the application, bulk material characteristics and feed rate. Proper selection of a valve rotor is crucial as it helps prevent premature wear, downtime, reduced efficiency and increased maintenance.
Endplates are precisely designed and manufactured to properly fit both ends of a valve housing, thereby acting as side covers of a housing. Endplates contain and prevent dry bulk solid leakage in the longitudinal direction of a rotary valve. A rotary valve endplate has a circular opening (hole) at its center that acts as a pathway for a rotor shaft which allows the rotation of a rotary valve rotor during operation. These plates fall into two categories based on their design configuration; inboard and outboard mounted bearings. They are sometimes referred to as housing cover plates. It is on these cover plates where bearings and seals are installed to allow smooth and leakage-free bulk solids handling.
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.
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