994-500 Series Air Dryer System

994-500 Series Air Dryer System

The newest version of air dryer to use Graham-White's innovative technology to produce clean, oil-free, dry compressed air for use in locomotives, the 994-500 offers a lower-cost alternative for locomotives operating in the range of 3,000-4,000 hp. The 994-500 is fully interchangeable with the "life cycle cost saving "994-100 series and has half the moving parts of the original 975 Series line, saving the customer both initial and upkeep expense.

Technical Specifications

Operation Twin tower, pressure swing regeneration, 65 second cycle per tower (48 sec regeneration & 17 sec repressurization) - one complete cycle each 130 sec
Desiccant Material Activated Alumina - in bags
Pressure Max system pressure - 150 psig (10.0 bar)
Temperature -40 deg. F to +160 deg. F (-40 deg. C to +70 deg. C) Heater is included as a standard feature
Inlet Flow 100 scfm nominal (2826 l/min)
Self-Adjusting Purge Valve Automatically meters the proper amount of regeneration air based on inlet conditions. Eliminates wasted purge air at low flows and maximizes dryer performance at high flows.
Pressure Drop 5 psig max (less coalescer) at 100 scfm @ 100 psig & 105 deg. F
Coalescing Filter Rating 99.9% efficiency @ 0.3 microns
Voltage 45 to 85 VDC (74 VDC nominal) - able to handle surges up to 138 VDC
Current 0.5 A max @ 74 VDC (heater off)
10 A max @ 74 VDC (heater on)
Electrical Connection Quick disconnect
Exposure Resistant to direct water spray and damage from flying debris
Shock 10 g in all 3 axis
Vibration Meets or exceeds both GETS & EMD requirements for OEM products
Fatigue NFPA T2.6.1-1974, cyclical category 3/90 @ 140 psig
EMI Meets or exceeds both GETS & EMD requirements for OEM products
Size 29" W x 24.22" H x 16.5" L 
737 mm W x 615 mm H x 419 mm L
Weight 155 lbs (45 kg) - Dryer only 75 lbs (34 kg) - Mounting bracket only
Options Muffler
Memory Timer
Multi-Language Labels

Illustration may not depict actual product specifications.

994-500 Series Air Dryer System