Klinkenberg End-Valve Screw

Dosing powders
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End Valve Screw

Tailored Precision Dosing with Controlled Outlet Regulation

When it comes to dosing screws, maximum accuracy is expected. You want to be certain that your powder materials are dispensed evenly and precisely. Klinkenberg’s end-valve screw is engineered to meet your specific requirements. Below you’ll find more information about how our discharge flap screw can support your process.
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Pneumatically operated End-Valve Screws:Accurate dosing without after-flow

Pneumatically operated End-Valve Screws are specifically developed to ensure accurate dosing of bulk materials, particularly for products that tend to continue flowing after the feed is stopped (after-flow). This type of Screw Conveyor is equipped with a valve mechanism at the end, which is operated using compressed air. Once the desired quantity of product is reached, the valve immediately closes the discharge opening. This prevents unwanted material discharge, which is crucial in applications where precision is essential.

Operation of the pneumatic End-Valve Screw

During conveying, the screw transports the bulk material to the outlet. When the preset dosage is reached, the pneumatic system is activated, and the valve closes the opening immediately. This prevents excess material from flowing out uncontrollably, which is especially important for free-flowing powders and granulates.

An End-Valve Screw Engineered with Care for Precision Dosing

The development of dosing screws with integrated pneumatically operated flap systems requires careful engineering. In many cases, the influence of the material properties is underestimated, even though the product composition plays a key role in the reliable functioning of the discharge flap.

Product buildup at the flap or overflow from watery substances can impair the sealing function. That’s why it is critical to select the right materials for the valve seat, ensuring dependable performance even during long-term operation.

Industrial Applications

Pneumatically controlled end-valve screws are widely used in industries where high dosing precision is essential—such as the chemical, pharmaceutical, and food sectors. These screws are suitable for accurately dosing materials like flour, sugar, plastic granules, and fine chemical powders without waste or product loss.

Advantages of a Pneumatic End-Valve Screw

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High dosing accuracy

Prevents overdosing and product loss.

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Consistent sealing

Pneumatic flap ensures fast and reliable shut-off.

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Hygienic design

Available in stainless steel for cleanroom or food-grade environments.

End-Valve Screw for Precise Dosing

For precise dosing without dribble, a pneumatically operated end-valve screw is an ideal solution. By mounting bearings on one side of the screw, an axial outlet can be created, which is sealed with a pneumatic valve. End-valve screws can be supplied with ATEX certification and are available with various finishes depending on your requirements.

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Flexible Use Under a Range of Process Conditions

Using a end-valve in pressurized or vacuum conditions is no exception. The flap system can be tailored to customer-specific needs and is available in diameters ranging from Ø50 to Ø485, with capacities up to 20,000 liters per hour.

  • Compact design
  • Accurate performance
  • Operates under pressure or vacuum
  • Ideal as refill system for weighing installations
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We are happy to help The use of a pneumatically operated end valve enables a controlled and efficient dosing process. This enhances process reliability and minimizes material waste, which is essential in precision-driven industries.

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Applied Technologies We always choose the right technology for your process

Klinkenberg technology includes the following variations:

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Technologies, finish and safety.

Would you like to know more about the underlying or applied Technologies for screw conveyors, such as the use of bearings, seals, safety, ATEX or a desired finish?

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Variants

Hopper with end valve

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Double end-valve screw conveyor

 
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End valve with pressure compensation

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End valve with sight glass

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Documentation Exclusive with a personal design

Bulk density table

Bulk density table

Expressed in kg/m³ and lbs/ft³

View and download

FAQ Direct answers to your questions

Quickly find answers to frequently asked questions about Pneumatically Operated End-Valve Screw Conveyors. Our FAQ section helps you make the right choice.

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A pneumatically operated end-valve screw conveyor is a dosing screw equipped with a discharge shut-off mechanism controlled by compressed air. This prevents backflow of product and ensures accurate dosing.

When dosing free-flowing materials such as powders and granulates, product may continue to flow after the feed has stopped. The end-valve immediately closes the outlet, preventing overdosing and material waste.

Once the desired amount of product has been conveyed, the valve is activated by a pneumatic system. This ensures the outlet is closed quickly and effectively, preventing any excess material from flowing through.

Pneumatically controlled End-Valve Screws are widely used in the chemical, pharmaceutical, food, and plastics industries. They are ideal for applications requiring high dosing accuracy.

  • Accurate dosing: prevents material waste.
  • Fast and reliable shut-off: prevents material from trailing after dosing.
  • Hygienic design: suitable for food and pharma applications.
  • Automated control: easy to integrate into an automated process.

Yes, these screws can be designed to meet specific requirements regarding capacity, material type, and installation. Stainless steel is available for hygienic applications.

Regular maintenance is necessary to ensure reliability. This includes checking seals, cleaning the valve, and testing the pneumatic system for proper operation.

Yes, these screws can be adapted to existing conveying systems and easily controlled via PLC systems or other process automation.