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Hitachi Oil Free Screw Compressors

HITACHI oil free screw compressor DSP series
  • Environmentally friendly, oil free rotary screw compressor
  • Easy operation by large LCD monitoring display
  • Advanced functions and performance by scheduled operation and efficient maintenance
  • Contribution to cost saving and productivity

Ultimate Air Quality

Test and analysis by third party TÜV (The Technische Überwachungs Verein) of condensation of oil in the discharge air of Hitachi Oil-free Screw Compressor (DSP), proved and certified the highest level of quality air “Class 0” based on ISO8573-1 standard.


DMD — Desiccant Modular Dryer — 3 to 240 scfm

DHL — Desiccant Heatless Dryer — 80 to 5000 scfm

DEX — Desiccant Externally Heated Dryer — 200 to 3500 scfm

DBP — Desiccant Blower Purge Dryer — 500 to 10,000 scfm

This is a picture of a SULLAIR Heated Desiccant Dryer
Desiccant Dryer Features

The Sullair desiccant regenerative dryer family is ideal for outdoor compressed air piping and operations that require an extremely low dew point to -40°F (-4°F or -100°F optional). By combining the proven benefits of desiccant drying with the most advanced designs, Sullair offers a reliable system to clean and dry compressed air for the most critical applications.

Max Inlet Temperature: 150°F (66°C)
Max Inlet Pressure: 230 psig
Max Ambient Temperature: 120°F (50°C)

Types of Sullair Heated Desiccant Dryers
This is a picture of a SULLAIR Heated Desiccant Dryer - DEX and DBP Series

dex and dbp series

200 – 10,000 SCFM


Same high quality standard features as DHL
Insulated heater housing and piping
High outlet temperature shut off and alarm
User-friendly diagnostic control display
Safety back-up contactors
PLC control and display (Siemens)
Thermostatically controlled heating
Safety heater thermostat
Low-watt density heater
Tower pressure gauges
Fail safe design in case of power failure
Color touch screen monitor
PLC ethernet communication port

SULLAIR Heated Desiccant Dryer - DHL Series - supplied by Air Rotory

DHL series

80 – 5000 SCFM


PLC controls with text display
Pre- and after-filter pre-piped and mounted
Field adjustable drying cycle time (10 –15 min.)
Pilot air filter n Easy front access control panel
-40°F pressure dew point n Fully automatic self contained dryer
Adjustable purge valves
High quality valves
Purge flow indicator
ASME/CRN code welded pressure vessels
UL/CUL electrical certified
Separate drain and fill port
Robust steel frame with floor stand
Separate safety pressure relief valve for each tank
Stainless steel inlet/outlet diffusers

This is a picture of a SULLAIR Heated Desiccant Modular Dryer - DMD Series- supplied by Air Rotory

Desiccant Modular Dryer (DMD)


Completely automatic
Compact design
-40°F pressure dew point
Adjustable wall mounted
Quick and easy connection
Long-lasting high-quality components

Advantages of Sullair Heated Desiccant Dryers

Advanced PLC Controller

A programmable PLC controller with back lit display is standard on all DHL series dryers. The controller is simple to use and comes standard with these great features:

PLC read out
Adjustable cycle time
Filter change alarm
Failure to switch contact
Dew point monitoring contacts
Red light alarm indicator

Optional Demand Cycle Controller

— Dew Point Meter

The dew point transmitters are reliable, compact and provide continuous monitoring of the dryer performance. With available options, the monitors can be used as indicators, alarm units or controllers. Its simple but powerful interface permits the user to choose between multiple units, output data to a PC using the serial interface, set alarm levels and do field calibration of the sensor.

Desiccant Adsorption

Sullair uses a high quality activated alumina desiccant for all our desiccant dryers. The desiccant has high crush strength media with a very high surface/volume ratio. To achieve alternative dew points the Sullair dryer uses a mixture of adsorption media.

Butterfly Valve

These versatile valves provide precision control and bubble tight shut off. The digitally controlled actuators have easy PLC interface and feature fast response times. The butterfly valve is carbon steel with stainless steel disc and staff (800 scfm and above).The tongue-and-groove seat design ensures complete isolation of the flowing media from the body and stem. Rugged and reliable, these valves are designed to provide years of trouble free service.

High Efficiency Blower

The centrifugal blower is sized optimally to provide continuous air stream to the heater for regeneration. The blower is equipped with: n Intake filter n Muffler for quieter operation n Safety belt guard and check n Relief valves for high-pressure safety.

Angle Body Piston Valve

The high performance two-way direct acting valves are designed for reliability and durability. The valve uses a profiled disc in conjunction with a high-resolution compact positioned and linear feedback potentiometer to provide precise proportional flow. The stainless steel internals and a tough fiber composite actuator body, along with the use of oversized bearing and Viton seals makes it possible to consistently provide smooth piston movement for an extended time period.

Energy Efficiency

The optimal combination of components — from specially designed impellers to tilting pad journal bearings – help Sullair centrifugal compressors operate with high efficiency which results in lower power consumption.

Low Maintenance

The simple design means fewer moving parts. Because many of the components have very low potential for wear, ongoing maintenance is significantly reduced. The horizontally split gear box bearing, along with a split bearing and seal design, offers easy and convenient access to maintenance items: all moving parts can be checked by simply removing the gear box cover.

Ease of Operation

Sullair Centrifugal Compressors are designed to be installed — and provide ongoing reliable operation. The compressor is equipped with many features that are packaged as standard — minimizing installation time.

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