Desiccant dryers · PRODRY PD004–PD035
Walker PRODRY desiccant air dryer (PD004–PD035, low flow)
Heatless regenerative desiccant dryer for points of use and low flows. -40 °C pressure dew point as standard (ISO 8573-1 class 2), -70 °C optional. 0.01-micron XA-grade coalescing pre-filter included, desiccant cartridge with integral 1-micron dust filter, energy-management LED controller. Anodised-aluminium body, vertical or horizontal mounting. 4 to 35 SCFM, 3/8″ NPT.
From $2,373 CAD, before taxes. Installation and shipping extra. The quote prevails.
- Flow
- 4–35 SCFM
- Dew point
- -40 °C (-40 °F)
- Models
- 7
| Model | Flow | Conn. | Cartridges | Weight | Price | |
|---|---|---|---|---|---|---|
| PD004 | 4 SCFM7 Nm³/h | 3/8" NPT | 2 | 28.6 lb13 kg | $2,373 | |
| PD006 | 6 SCFM10 Nm³/h | 3/8" NPT | 2 | 30.8 lb14 kg | $2,454 | |
| PD008 | 8 SCFM14 Nm³/h | 3/8" NPT | 2 | 33 lb15 kg | $2,504 | |
| PD010 | 10 SCFM17 Nm³/h | 3/8" NPT | 2 | 37.4 lb17 kg | $2,665 | |
| PD015 | 15 SCFM25 Nm³/h | 3/8" NPT | 2 | 44 lb20 kg | $2,770 | |
| PD025 | 25 SCFM42 Nm³/h | 3/8" NPT | 2 | 52.8 lb24 kg | $4,966 | |
| PD035 | 35 SCFM59 Nm³/h | 3/8" NPT | 2 | 68.2 lb31 kg | $5,658 | |
Range specifications
- Technology
- Heatless (purge-regenerated, pressure-swing adsorption)
- Dew point — standard
- -40 °C (-40 °F)
- Dew point — options
- -70 °C / -94 °F (ISO 8573-1 class 1, high-performance cartridges)
- Operating pressure
- 4–16 barg (58–232 psig)
- Inlet temperature
- 1.5 °C (35 °F) → 50 °C (122 °F)
- Controller
- Intelligent LED controller (built-in energy management)
- Power supply
- 12–24 VDC ou 100–240 VAC (50–60 Hz)
- Energy management
- Purge flow isolated during low-demand periods (air saving)
- Standard
- 0.01-micron XA coalescing pre-filter + desiccant cartridge with integral 1-micron dust filter
- Recommendation
- A high-efficiency water separator upstream is required (warranty). RX1 (1-micron) dust filter recommended at the outlet.
- Certification (CRN)
- Walker indicates CRN registration (pressure vessels). To be confirmed by province with CAG before publication.
Correction factors (sizing)
| Operating pressure | Factor |
|---|---|
| 4 barg (58 psig) | 0.62 |
| 5 barg (72 psig) | 0.75 |
| 6 barg (87 psig) | 0.87 |
| 7 barg (100 psig) | 1.00 |
| 8 barg (116 psig) | 1.12 |
| 9 barg (130 psig) | 1.25 |
| 10 barg (145 psig) | 1.37 |
| 11 barg (160 psig) | 1.50 |
| 12 barg (174 psig) | 1.62 |
| 13 barg (189 psig) | 1.75 |
| 14 barg (203 psig) | 1.87 |
| 15 barg (218 psig) | 2.00 |
| 16 barg (232 psig) | 2.12 |
| Inlet temperature | Factor |
|---|---|
| 20 °C (68 °F) | 1.07 |
| 25 °C (77 °F) | 1.06 |
| 30 °C (86 °F) | 1.04 |
| 35 °C (95 °F) | 1.00 |
| 40 °C (104 °F) | 0.88 |
| 45 °C (113 °F) | 0.78 |
| 50 °C (122 °F) | 0.55 |
| Target dew point | Factor |
|---|---|
| -40 °C (-40 °F) | 1.00 |
| -70 °C (-94 °F) | 0.70 |
Usable capacity = rated flow × F(pressure) × F(inlet temperature) × F(dew point). Conversely: required flow ÷ (product of factors) → pick the model whose rated flow ≥ the result. Rated conditions: 7 barg (100 psig), 35 °C, -40 °C PDP. Source: Walker datasheet WFL1067.
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