Wm. W. Meyer & Sons, Inc.

- Model HDAR - Heavy Duty Abrasion-Resistant Drop-Thru Rotary Airlock Valves



The HDAR Heavy Duty Abrasion-Resistant Drop-Thru rotary airlock valves are designed for severe applications where highly abrasive conditions exist. Offered in a choice of ceramic lined or DuraKast, both can significantly improve the wear factor on the valve and reduce the pre-mature equipment failure often associated with such applications.

  • Our rotary airlock valves are used in a wide range of applications where there is need to minimize system air loss while transferring material between vessels with differing pressures.
  • They are used as feeder valves to meter the flow of material between vessels with equivalent pressures.
  • You will also find them doing double duty in systems where there is a need to minimize system air or gas loss while regulating the flow of material between vessels with differing pressures.

The ceramic version starts with any of our Heavy-Duty rotary airlock valves. We bond ceramic tiles to the inside of the cast iron housing and on the rotor tips. The DuraKast units are completely cast out of a hard chrome material suitable for applications with higher pressure differentials. The DuraKast units also have Stellite™ on the rotor tips for extended abrasion resistance. Both styles offer extended life over that of a standard cast iron rotary valve by as much as 6 times.

  • Pressure Rating: 22 PSI
  • Maximum Operating Temperature: 250°F
  • Materials: Dry Free-Flowing Extremely Abrasive Particles

  • Pneumatic Conveying, Blending, Dust Collection, Drying, Pollution Control, Weighing, Mixing, Feeding

  • Mining – Sand, Alumina, Copper
  • Power – Fly Ash, Coal
  • Cement – Kiln Dust, Raw and Finished
  • Asphalt – Limestone, Granite
  • Steel – Oxides, Grinding Dust, Sinter


  • Precision-Cut ceramic tiles bonded in place minimizing gap exposure
  • Closed-End rotor designs with ceramic tiled end disc perimeter and tungsten carbide tips for prolonged wear resistance
  • HVOF spray on packing area for extended shaft life
  • Ceramic can be re-ground for additional life


  • Oversized housing thickness designed to be re-ground for many years of service
  • Pre-Cast flange holes allow for easy field installation on new or replacement units
  • Closed-End rotor with welded hard faced stellite tips for maximum wear resistance
  • End plates are hard chrome lined with optional purging feature
  • Higher pressure differentials for highly abrasive applications 650 Bhn high chrome wear resistant casting for maximum life

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