Kreisel: Screw Pump vs. Rotary Valve

What this video shows

The video presents KREISEL rotary valves used to transfer powders or granules between process stages.

It focuses on the valve as a feeding and pressure-interface component rather than as a simple open-or-closed shut-off valve.

Process challenge

A bulk-solid feeder must introduce material at a controlled rate while working with the pressure, leakage and flow conditions created by the surrounding process.

In pneumatic conveying, the feeding device also affects conveying-air demand, product acceleration and system stability.

Demonstrated solution

KREISEL presents rotary-valve arrangements for general bulk-solid transfer, difficult-flow materials and higher-pressure duties.

The correct arrangement depends on the material, required throughput, pressure differential, inlet condition, wear rate, temperature and cleaning requirement.

Operating principle

A rotating pocketed rotor accepts material at the inlet and carries it to the outlet. The clearances between rotor and housing limit uncontrolled gas flow but do not create a gas-tight seal.

Actual volumetric capacity is lower than the geometric displacement because pocket filling, material aeration, leakage and discharge behaviour change with the application.

Configurations discussed

• Standard rotary valves: General transfer of dry, free-flowing powders and granules.
• Clearing arrangements: Additional features intended for materials that tend to stick or bridge.
• Higher-pressure designs: Configurations intended for larger pressure differentials and pneumatic-conveying feed points.

Technical details stated in the video

The video states ranges for throughput, temperature, valve size and application-specific protection options. These values belong to the configurations presented and should not be applied to an unspecified valve.

For abrasive duties, the video also describes KREISEL's Ultra-Carbide® wear-protection option. Wear performance should be evaluated against the actual particle hardness, velocity, loading pattern and service interval.

Engineering relevance

Valve selection should define whether the primary duty is volumetric feeding, pressure isolation, filter discharge or controlled transfer.

The review then needs rotor geometry, clearances, drive torque, leakage handling, venting, access, guarding and the applicable hygiene or explosion-protection concept.

Typical applications

• Feeding powders or granules into pneumatic conveying lines.
• Discharging filters, cyclones, silos and hoppers.
• Volumetric transfer into mixers, dryers or reactors.
• Handling abrasive, hot or hygiene-sensitive materials with a suitable configuration.

Key takeaways

• A rotary valve meters by pocket volume while limiting pressure leakage across the process boundary.
• Throughput and leakage depend on the complete duty, not valve diameter alone.
• Wear, temperature, cleaning and protection requirements must be tied to the quoted model and options.

About KREISEL Industries

KREISEL Industries supplies components and systems for bulk material handling, including rotary valves and pneumatic conveying equipment.