DSP Series Oil Free Rotary Screw Air Compressor

The DSP Series brings advanced oil free operations right where it is needed: your facility! Built on Hitachi engineering, the DSP is designed to supply oil free air reliably and efficiently— today and tomorrow.

Innovative Air End Construction

Key features: 

• Rotor design, material and coating optimized for efficiency
  • Stainless steel rotors in 1st and 2nd stage
  • Patented PTFE-free rotor coating
  • Rotor housing coated internally

Benefits:

• All aspects of the air end have been carefully engineered to provide long life and high efficiency
  • The stainless steel rotors, patented rotor coating and coated housing provide long life of air end

Patented High Pre-Cooler Design (Air Cooled Units)

Key features: 

• Stainless steel high pre-cooler placed before aftercooler

Benefits: 

• Helps prevent thermal fatigue and premature failure of the aftercooler, providing higher reliability and durability

Motorized Isolation Valve (MIV) 

Key features: 

• Located at the compressed air discharge, the MIV helps avoid migration of moisture back into the compressor package when the DSP is not running
  • Opens when the motor is running and closes when the motor is off

Benefits: 

• Provides additional protection for the compressor against downstream humidity – one of the biggest enemies of oil free screw compressors

Oil Mist Remover (OMR) 

Key features: 

• Removes oil mist from gearcase with 99.99% efficiency
• Maintains gearcase at negative pressure

Benefits: 

• Recaptured oil mist is returned, reducing gearcase top offs needed — saving you money
• Helps ensure a cleaner production environment around the compressor

Capacity Control System

Fixed Speed
Key features: 

• Spool type — simple design
• Pneumatically controlled
• Designed to operate 1 million cycles/year

Benefits: 

• High reliability and durability
• Lower maintenance cost
• Longer maintenance intervals

Variable Speed Drive (VSD) 
Key features: 

• No inlet valve on VSD
• Two speed reduction
• Turndown works always in the most efficient range of specific power. Below turndown DSP works load/unload at minimum point of turndown

Benefits: 

• No restriction means no air losses at inlet
• Minimize power consumption at unload condition
• Power consumption at no load is reduced up to 30% vs fixed speed of same model

Hitachi Motors

Key features: 

• IE3, TEFC and IP44 (Fixed Speed 22-240 kW models and VSD 160-240 kW models)
• TEFC, DCBL-PPM and IE4 (DSP37V, DSP55V and DSP75V models)

Benefits: 

• Support provided in house — no external motor suppliers to navigate
• Motors are high efficiency and very compact

VSD Fan Motors 
Available on DSP22-75

Benefits: 

• More efficient cooling system

Hitachi Inverters

Benefits: 

• Support provided in house — no external inverter suppliers to navigate

Phase Monitor

Benefits: 

• Protects the compressor against improper reverse rotation at startup

Warranty

• All DSP Series Compressors feature a 3 year package warranty* when continuously serviced with genuine
  DSP parts