Overview

Whether you're running automation lines, sensitive instruments, or high-pressure tools, dry compressed air is critical to keep operations running smoothly and reliably. Donaldson’s heatless desiccant air dryers provide a practical solution — helping you prevent condensation-related issues without the complexity of externally heated systems.

Each dryer is delivered as a ready-to-use air dryer system, complete with pre- and after-filtration, zero-loss condensate drainage, and options for dew point-based purge control. From compact point-of-use units to high-pressure industrial models, our systems help reduce air loss, simplify installation, and support consistent air quality across a wide range of flow capacities.

Ultrapac™ HL-ALD / HL-MSD Standard Heatless Desiccant Dryers for Clean, Reliable Compressed Air

The Ultrapac™ HL dryer series is designed to consistently provide highly purified compressed air in flow ranges from 100 to 1,000 m³/h (60 to 600 scfm) at 7 bar(g) / 100 psig. All systems include UltraPleat™ pre- and after-filters, with a zero-loss, level-controlled drain in the pre-filter.

Main Features & Specifications

  • Complete purification package with pre-/after-filter and zero-loss drain
  • Ultraconomy dewpoint control (Superplus) supports better utilization of desiccant capacity by adjusting cycle times
  • All silicone-free materials — For silicone-free compressed air
  • Open-frame design — Allows easy access to all components
  • Stable pressure dewpoint: -70°C / -100°F at 70% load; -40°C / -40°F at 100% load
  • Intermittent operation standard — Helps provide compressed air savings
  • LED display — For clear status indication and ease of use
  • Compact footprint — Ideal for space-constrained installations
  • Additional models available for flows up to 8,750 m³/h (5,150 scfm)

Application

  • Mid-range desiccant air dryers for compressors in industrial environments
  • Moisture-sensitive systems requiring consistent dewpoint performance
  • General adsorption compressed air dryer applications with reduced air loss requirements

HLP Series High-Pressure Heatless Adsorption Dryers for Demanding Industrial Applications

The Donaldson HLP dryer series is a complete adsorption air dryer system designed for high-pressure operation up to 400 bar g (5,800 psig). Available in flow ranges from 40 to 1,200 m³/h (24 to 705 scfm), HLP dryers are suitable for technical gases and applications where high-purity, dry air is essential.

Main Features & Specifications

  • Ultraconomy dewpoint control (Superplus) supports better utilization of desiccant capacity by adjusting cycle times
  • Stable pressure dewpoint: -40°C / -40°F at 100% load
  • Intermittent operation standard — Supports compressed air savings
  • Complete purification system with high-efficiency filters and zero-loss condensate drainage

Application

  • High-pressure dual tower desiccant air dryers for technical and industrial gases
  • Systems requiring stable dewpoints with reduced purge air loss
  • Critical environments such as oil & gas, chemical, and power generation sectors

 

 

Availability varies by region. Please contact your local Donaldson representative for specific availability in your region. All products, specifications, and availability are subject to change without notice.