UNITED UCS Air Compressors is a testament to the quality of the Chinese air compressor brand. Is the only brand collaborating with the group Hitachi air compressor Japan.

Products are designed to save energy and be environmentally friendly. United UCS includes a range from single stage compressors to two-stage air compressor, low pressure, high pressure compressors and many other specific types, etc. For all industrial applications from general to special needs such as underground tunnel drilling, rock drilling, or the pharmaceutical industry, United UCS provides comprehensive solutions.

Overview of UNITED UCS 2-stage air compressors

UNITED is a brand specializing in industrial air compressors, providing highly reliable compressed air solutions suitable for demanding plant operating conditions. The product line UNITED UCS oil-lubricated – 2-stage compression developed based on the actual needs of businesses: higher performance than a single-stage machine, more energy efficient, and provides stable long-term operation..

This machine is suitable for:

• Medium and large-scale manufacturing plants
• Central compressed air system
• The production line operates continuously 24/7.
• Businesses want to optimize electricity costs in the long term.

Operating principle of a two-stage screw air compressor.

Unlike single-stage air compressors, UNITED UCS 2-stage compression divide the compression process into two stages:

• First compression stage: Compressing gas from atmospheric pressure to intermediate pressure levels.
• Second compression stage: Continue compressing the air to the required working pressure.

Between the two compression stages there is Intercooler helps lower the air temperature before it enters the second compression stage. As a result:

• Reduce the heat generated during the compression process.
• Reduce energy losses
• Increase overall compression efficiency
• Reduce the mechanical load on each compressor head.

Increase overall compression efficiency

UNITED UCS air compressors are used oil-lubricated screw technology, in which oil plays the role of:

• Lubrication screw surfaces
• Seal gap, improving compression efficiency
• Cooling during the compression process
• Reduce friction and wear.

In addition, the system multi-stage oil separation helps keep residual oil levels in compressed air low, making it suitable for most industrial applications.

Typical specifications – UNITED UCS 2-stage air compressor

United UCS oil-lubricated air compressor design – Optimized structure for durable operation.

The single-stage United UCS oil-lubricated screw air compressors own patented design, with structure two independent compartments: a hot compartment and a cold compartment., helps optimize cooling airflow, improve operational stability, and extend the lifespan of the entire system.

Hot compartment the optimally designed airflow ensures efficient cooling for all functional components. As a result, the machine operates stably, accurately, and reliably for a long time.

Cold compartment features a flexible modular design that is easy to disassemble for maintenance. High-quality soundproofing materials help effective noise reduction, while also meeting the requirements environmental protection in a modern factory.

Air filtration system – Maximum protection for the compressor unit.

Inlet air filtration:
Prevent large dust particles and impurities from entering the compressor.

Prevent large dust particles and impurities from entering the compressor.
Filter accuracy achieved 99.9% effective against dust particles >3μm, it can withstand high pressure and is suitable for dusty industrial environments.

The air intake is designed to be twice as large:
Reduce the pressure differential downwards 0,2 bar, helps extend the filter's lifespan.

Large diameter air intake valve:
Made from cast aluminum, it reduces energy consumption at idle, ensuring stable performance.

Heavy-duty rubber intake hose:
High durability, excellent sealing, and long service life.

Oil-gas separation system – Clean compressed air, oil content ≤ 2 ppm

The oil-gas separator core is designed according to European standards, use fiberglass materials, high separation efficiency and long lifespan.

The intelligent oil return mechanism helps to:

• Increase the rate of lubricant recovery.
• Prevent oil evaporation
• Ensure the correct oil content in compressed air ≤ 2 ppm

UCS Specialized Lubricants

UCS coolant contains:

• Excellent high antioxidant
• Withstands high temperatures
• High flash point
• Superior thermal conductivity

It helps maintain a stable temperature and extends the lifespan of the compressor unit.

PLC control system and touchscreen display

The machine is equipped with PLC + color LCD touchscreen, user-friendly interface, easy to operate.

• Monitoring operational status 24/7
• Automatic maintenance alert
• Connectivity USB / COM, easy to upgrade
• Installation, operation, and system inspection remote monitoring and control support
• Collect operational data for service energy management

Permanent magnet motors – Efficiency up to 96%

• Engine performance achieved 96%, power factor 0.99
• Permanent magnets withstand temperatures up to 180°C, without losing words
• Independent fan cooling, safe operation at low frequencies.
• Class F insulation, temperature resistance increased to 70K.
• Protection level IP55, completely dustproof and moisture-proof
• Integrated thermal protection for the coil and magnet.

VFD inverter technology – Maximum energy savings

• Open-loop vector control, fast and accurate response.
• Stable operation even at low load.
• Controlled pressure fluctuations in ±0,01 MPa
• Soft start, reduced starting current.
• Wide speed adjustment range, stable up to 0,01 Hz
• Overheating protection, shutdown protection during abnormal operation.
• Integrated PLC and communication, easy to use and maintain.

The outstanding advantage of the two-stage compression technology on UNITED UCS

Compared to conventional single-stage screw air compressors, the UNITED UCS two-stage compressor offers:

• Save 10–20% on electricity (depending on operating conditions)
• Lower compressor head temperature, increasing durability
• Higher compression efficiency, especially at high loads
• Stable operation when running continuously 24/7.

This is an ideal choice for businesses that have electricity costs account for a large proportion of production costs..

Practical applications 

UNITED UCS oil-lubricated, two-stage air compressors are widely used in:

• Mechanical - manufacturing plant
• Steel, plastics, and packaging industries
• Heavy industrial production line
• Centralized compressed air system for multiple workshops

According to feedback from the operations engineer, the switch from a single-stage machine to UNITED UCS 2-stage compression helps significantly reduces monthly electricity costs and increases system stability..