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Diverter Valves and Flow Control Valves

In dry bulk material handling systems, maintaining control over the movement and direction of bulk materials is critical to smooth operation and system performance. Diverter valves and flow control valves are key to achieving this control by managing how and where bulk solids are transported within the system. These valves are designed for durability and precision, ensuring smooth operation with a wide range of bulk solids—from fine powders to coarse pellets and granules.
Key Functions of Diverter and Flow Control Valves:

• Shut Off Flow: Completely stops the movement of bulk materials when needed, for maintenance, operational shifts, or safety protocols.

• Regulate Flow Speed: Controls the rate at which materials pass through the system, allowing for accurate dosing, batching, or blending.

• Change Flow Direction: Redirect bulk solids from one discharge point to another, enabling distribution to multiple processing or storage points.
Diverter and flow control valves are essential in industries such as food processing, chemicals, plastics, cement, and mining. They are designed to handle dry bulk solids from free-flowing powders to more challenging materials like sticky granules or abrasive particles, ensuring both efficiency and safety in demanding operations.

Diverter and Flow Control Valve Solutions for Bulk Material Handling

Polimak offers a wide variety of diverter and flow control valves for handling dry bulk materials in both pneumatic conveying and gravity-fed systems. These valves are designed to meet diverse industrial needs, ranging from standard applications to highly specialized processes. In addition to the standard models, we also offer custom-designed solutions to meet unique operational requirements. Available models include:

• Butterfly Valves

• Slide Gate Valves

• Flap Type Gravity Diverter Valves

• Flexible Tube Diverter Valves

• Multiport Diverter Valves

• Pinch Valves

• Flap Type Pneumatic Conveying Diverter Valves

• Iris Valves

• Flow Control Gate Valves

• Custom Designed Valves

• ATEX Certified Diverter and Flow Control Valve
Designing valves for bulk solids handling systems demands not only technical expertise but also a deep understanding of bulk material behavior, flow dynamics, and system integration. With over 45 years of experience in bulk material handling solutions, Polimak brings extensive industry knowledge to every project, ensuring that each valve is engineered for optimal performance and durability. Choosing the right valve is critical to achieving consistent, long-term operation without material blockages, wear issues, or maintenance disruptions. Polimak’s experienced technical team conducts detailed engineering analyses and applies precision manufacturing techniques to deliver reliable, customized flow control solutions tailored to the specific needs of a wide range of industries.

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PRODUCTS ATEX Certified Diverter and Flow Control Valves In many industrial operations, dust explosions remain a significantly underestimated hazard with potentially severe consequences. Although typically unnoticed in normal operations, the presence of combustible dust presents a serious risk if not effectively managed. These incidents not only threaten human safety but can also cause significant equipment […]

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Butterfly valves are designed to provide an efficient method for controlling the flow of free-flowing dry bulk materials.

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PRODUCTS Custom Designed Valves Polimak offers more than standard valve solutions. Custom designed diverter and flow control valves are developed to meet the specific demands of complex and high performance industrial environments. Polimak provides engineered solutions tailored to each application, whether the requirement involves handling abrasive materials, operating under extreme temperatures, or fitting into systems […]

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PRODUCTS Flap Type Gravity Diverter Valves Gravity discharge diverter valves play a critical role in bulk material handling systems by directing product flow from a single source to multiple destinations. These valves enhance process flexibility, allowing operators to control the transfering of materials without interrupting flow. They are preferred in systems where continuous operation and […]

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PRODUCTS Flap Type Pneumatic Conveying Diverter Valves Flap-type pneumatic conveying diverter valves are widely used in regulating the flow of bulk solids within pneumatic conveying systems. These valves are specifically engineered to redirect materials such as powders, pellets, flakes, or granules from a single feed line to multiple receiving points, under pressure or vacuum conveying […]

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PRODUCTS Flap Type Gravity Diverter Valves Flexible tube diverter valves are key to optimizing the performance and efficiency of pneumatic conveying systems. These valves are specifically engineered to manage and control the direction of bulk material flow, making it possible to distribute materials from a single source to multiple destinations. Their ability to handle various […]

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PRODUCTS Flow Control Gate Valves Efficient and safe management of bulk solids discharge is essential in many industrial processes, and flow control gates offer a reliable solution for this challenge. These valves are specifically engineered to regulate the release of bulk materials from storage units such as silos and bins, ensuring smooth and controlled flow. […]

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PRODUCTS Iris Valves In industries handling dry bulk solids, regulating material flow is essential for safety, cleanliness, and efficiency. Iris valves are widely used in managing material discharge in gravity-fed systems. Installed at the outlets of big bags (also known as FIBCs), hoppers, chutes, and other similar equipment, they allow operators to start, stop, or […]

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PRODUCTS Multiport Diverter Valves Multiport diverter valves, or multiway diverter valves, serve a key function in the efficient management of bulk material flow within pneumatic conveying systems. These valves enable the seamless distribution of materials such as powders, pellets, flakes, and granules from a single feed source to multiple destination points. Their versatility makes them […]

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PRODUCTS Pinch Valves Pinch valves are widely used in pneumatic conveying systems for the efficient handling of bulk materials such as powders, pellets, flakes, and granules. These valves serves to efficiently control the flow of materials, offering a reliable means to start or stop the material flow within the conveying line. Their configuration makes them […]

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PRODUCTS Slide Gate Valves Slide gate valves serve as a reliable and effective solution for regulating the flow of free-flowing dry bulk materials in a wide range of industrial applications. Although often known as knife gate valves because of their functional similarity, slide gate valves have structural differences that make them better suited for handling […]

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Our Engineering, Your Success… DISCOVER OUR PRODUCTS OUR PRODUCTS Explore our wide range of versatile bulk material handling machinery. Explore our wide range of versatile bulk material handling machinery. View all Rotary Valve A rotary valve, also known as an airlock feeder or airlock valve, is a piece of bulk material handling equipment used to […]

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OVER 40 YEARS OF SERVICE About Us Polimak is a leading engineering and fabrication company, specializing in bulk solids handling technologies for over four decades. Our wide range of versatile bulk material handling machinery is appropriate for value-added logistics as well as handling powders, granules and pellets in the food, chemical, plastics, minerals, and agriculture […]

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SHAPE THE FUTURE Career We are an internationally and rapidly growing dry bulk solids handling equipment and systems supplier which reckons that one of the key elements to success is acquiring a passionate, talented and diverse workforce. At Polimak, we work hard to establish an environment for our employees that delivers thought-provoking objectives, thus fostering […]

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Products Explore Our Wide Range of Versatile Products At Polimak, we offer a diverse selection of cutting-edge bulk solids handling machinery. Our products are designed to meet the unique needs of various industries, including food, chemical, plastics, minerals, and agriculture processing. From efficient logistics solutions to heavy-duty industrial applications, our exceptional range of products ensures […]

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These valves are typically actuated by pneumatic actuators and are used to automatically open and close the product flow to discharge material to downstream equipment.
Installed below silos or hoppers, these valves are used for maintenance operations of equipment such as rotary valves, screw feeders, etc., that are positioned below the butterfly valve.
These valves are typically actuated by pneumatic actuators and are used to automatically open and close the product flow to discharge material to downstream equipment.
In this design, the butterfly valve is sandwiched between two flanges. Rubber sealing at both faces of the valve provides a tight seal between the flanges and the wafer butterfly valve.
One side of the valve has a bolted flange connection, while the other side features a built-in short pipe designed for fixing a flexible sleeve.
These valves have bolted flange connections on both sides, making them suitable for installation on silos, hoppers, screw feeders, and similar applications.
Bulk tanker trucks or open trucks can be filled with powdered materials delivered within FIBC bags. These systems generally consist of bulk bag discharging station, mechanical or pneumatic conveyor and loading bellow. Big bag discharge station transfers the bulk solid from big bag to conveying system. Conveying system transfers it to truck loading area. And loading bellow is used to fill tanker truck without any dust emission. Since truck loading operations are done within limited time, high capacity big bag discharge systems and bulk material conveying systems are used. For short distances, screw conveyors are preferred to transfer material from big bag discharge station to truck loading chute. For long conveying distances, pneumatic conveying systems provide better service. There may exist a storage hopper or silo above bulk truck loading bellow to compensate material flow between inlet and outlet. Bulk bag discharge and truck filling systems have automatic control system that monitors product level in truck and operates all equipment accordingly. Optional weighing system can be added to measure the amount of material that is filled to truck.
Big bag discharge systems can deliver dry bulk solids in powder and granular form to weighing and batching systems. The loading hopper of the weighing system should remain full during dosing and batching. Big bag discharge systems can monitor the product level in the loading hopper and maintain a constant level automatically. Depending on the dosing speed and conveying distance, mechanical conveying systems or pneumatic loading systems may be used. Dust collectors can be employed to prevent dust emissions during hopper loading, especially for materials with high dust content.
Dry bulk packaging systems are used to fill powdered or granular materials into bags, drums, jars, sacks, etc. Bulk materials delivered in big bags must be transferred to packaging machines without interruption. The loading hopper of the packaging system should remain full during the filling and packaging process. Big bag discharge systems can monitor the product level in the loading hopper and maintain a constant level automatically. Depending on the packaging speed, mechanical conveying systems or pneumatic loading systems can be selected. Dust collectors can be used to prevent dust emissions during hopper loading, especially for materials with high dust content.
Mixer automation systems are used to mix dry bulk solids according to specific recipes. Raw materials delivered in FIBC bags can be transferred to mixing units through a combination of conveying equipment and bulk bag discharge systems. Depending on the type of application, pneumatic conveying or mechanical feeding systems can be used to fill mixers. Big bag discharge stations can be manufactured with built-in dosing systems. The amount of raw material to be loaded into the mixer is automatically controlled with the help of a weighing and dosing system. Dust collectors can be used to prevent dust emissions during the mixer filling process.
Bulk material stored in big bags can be automatically filled into small bags. Big bag discharge systems come with optional built-in bag filling units. For low filling capacities, these units are installed below the big bag discharge hopper, providing a practical and cost-effective solution. Both big bag discharging and bag filling operations can be handled by a single, compact system. For higher bag filling needs, bag filling machines are installed near the bulk bag discharge stations. Pneumatic conveying systems or mechanical conveyors can be used to transfer bulk material from the FIBC bag discharge station to the bag or sack filling system.
Mechanical conveyors can be used for silo loading from big bag discharge stations. Screw feeders, bucket elevators, rotary valves, or chain conveyors are connected to big bag discharge stations to fill silos. The selection of conveying equipment directly depends on the conveying distance, height, transferred material, and capacity. Bucket elevators are preferred for high silos, while screw feeders are preferred for shorter silos and short distances. The big bag discharge system can be installed on top of the silo for faster filling. In this case, rotary valves or butterfly valves are better choices as they provide simple flow control. Dust collection systems may be required depending on the dust content of the bulk solid. During silo loading, air content in the silo escapes to the atmosphere and carries some dust along with it. Vacuum fans and jet filters in dust collectors prevent dust emissions into the environment. The collected dust is sent back to the silo, thus preventing product loss.
Pneumatic conveying systems installed after bulk bag discharge units transfer bulk material through conveying pipelines to fill silos. This configuration is useful in applications where high transfer rates and long conveying distances are needed. In production lines where raw materials are stored in warehouses far from storage silos, bulk bag discharge stations can be installed close to the warehouses, and pneumatic conveying systems are used to fill silos from long distances. This design reduces the need for forklifts and cranes for bulk material transfer on the production site and increases overall efficiency.

Pneumatic conveying systems used for silo loading utilize blower pumps or compressors. Motor power, pipeline diameter, and equipment selection depend on the type of bulk material, transfer distance, silo height, and transfer capacity. Level sensors, jet filters, and other equipment are installed on storage silos to ensure the proper operation of the silo filling system.
Pneumatic conveying systems installed after bag dump units transfer bulk material through pipelines to fill silos. This configuration is ideal for applications requiring high transfer rates and long conveying distances. In production lines where raw materials are stored in warehouses far from storage silos, bag dump stations can be installed close to warehouses, allowing pneumatic conveying systems to transport materials over long distances. This design reduces the excessive use of forklifts and cranes for bulk material transfer within the production site, improving overall efficiency.

Pneumatic transfer systems used for silo loading utilize blower pumps or compressors. Motor power, pipeline diameter, and equipment selection depend on factors such as the type of bulk material, transfer distance, silo height, and transfer capacity. Level sensors, jet filters, and other equipment are installed on storage silos to ensure the proper operation of the silo filling system.
Mechanical conveyors can be used for silo loading from bag dump stations. In this configuration, screw feeders, bucket elevators, rotary valves, or chain conveyors are connected to bag dump stations to fill silos. The selection of conveying equipment depends on factors such as conveying distance, height, material properties, and capacity. Bucket elevators are preferred for high silos, while screw feeders are ideal for shorter silos and short distances. Bag dump systems can be installed on top of the silo for faster filling. In such cases, rotary valves or butterfly valves are better choices as they provide simple flow control.

Dust collection systems may be required depending on the dust content of the bulk solid. During silo loading, air inside the silo escapes to the atmosphere, carrying dust particles with it. Dust collectors equipped with a vacuum fan and jet filter capture airborne dust. The collected dust is returned to the silo, preventing product loss and ensuring a cleaner environment.
The inlet skirt is an optional feature designed to extend the lifespan of the flexible connector sleeve. Its upper portion is attached to the outlet port of the upstream equipment and extends down into the bin activator’s inlet port. The primary function of the inlet skirt is to serve as a protective shield, safeguarding the flexible connector seal from wear and damage.
A vibratory motor is externally mounted to the bin activator. When powered, the motor generates vibrations that facilitate a steady flow of dry bulk materials within the system. Depending on the application requirements, one or two vibratory motors can be installed externally.
To accommodate a bin activator, the cone of a silo must be shorter than usual, resulting in a wider outlet. A flange supplied with the bin activator is separately welded to the silo’s outlet, slightly above the opening, at the production site. Once installed, the vibrating bin discharger is securely bolted to the flange, ensuring a stable and reliable connection.
Special spring suspension links and an engineered polymer seal work together to create a flexible connection between a vibrating bin discharger and the equipment positioned above it.

The proper design and installation of the polyurethane seal prevent it from slipping off and ensure a secure seal, eliminating the risk of dry bulk material leakage. Additionally, the seal offers high stress resistance and long-term durability, withstanding stresses caused by motor vibrations, pressure conditions, and other operational factors.

Externally installed spring suspensions provide full resilience to the vibrations of the cone head. They ensure that the generated vibrations affect only the cone itself rather than the upstream equipment structure.
An internally tapered, conical-shaped baffle plate is positioned at the center of the bin activator’s diameter. The baffle is rigidly attached to the equipment body using structural steel components. It facilitates bulk material flow from upstream equipment by directly inducing vibrations into the material.

A secondary deflector plate reduces the weight of the bulk material in the lower portion of the bin activator by acting as a wedge beneath the material, directing it around the areas adjacent to the cone’s surface.

Polimak baffle plates are available in various configurations, including convex and cone plates, and in different angles (15°, 30°, 45°, or even 60°) depending on the flow characteristics of the handled bulk material and the specific application requirements.