RG Open Type Screw Compressor
Industrial Open Drive Screw Compressors for Ammonia, CO₂ and Industrial Refrigeration Applications
What is an Open Type Screw Compressor?
The RG Series Open Type Screw Compressor is engineered for industrial refrigeration systems requiring high efficiency, reliable continuous operation and flexible motor selection.
Designed for ammonia (R717), HFO and traditional refrigerants, the compressor provides outstanding performance for cold storage, food processing, ice plants, chemical plants and industrial cooling.
Why Choose RG Open Type Compressors？
Open Drive Design
Wide Capacity Range
Industrial Reliability
Easy Maintenance
Flexible Solutions for Different Refrigeration Requirements
The RG and RGII Series includes multiple compressor sizes and configurations to meet different cooling capacities, operating temperatures and installation requirements. RG models provide proven performance for conventional industrial refrigeration systems, while the second-generation RGII Series introduces optimized internal structures, compact integrated configurations and advanced motor options. The series is available as a standalone compressor, an integrated unit with a conventional motor, or an all-in-one solution with a permanent magnet variable-frequency motor.
RG Series
Displacement: 190 to 1,268 m³/h
Suitable models: RG-620 RG-830 RG-1150 RG-1270
- Proven open-drive structure
- Stepless capacity adjustment
- Adjustable internal volume ratio
- Separate oil supply design
- Suitable for various industrial refrigeration systems
RGII Compact Series
Displacement: 212 to 998m³/h
Suitable models: RGII-200 RGII-410 RGII-620 RGII-830
- Compact integrated structure
- Built-in discharge check valve
- Integrated coupling housing
- Optimized shaft seal cooling
- Improved internal gas flow
- Multiple motor configurations
RGII Large-Capacity Series
Displacement: 1,761–5,201 m³/h
Suitable models: RGII-1800 RGII-2280 RGII-2850 RGII-3500 RGII-4300 RGII-5200
- High displacement capacity
- Automatic Vi adjustment
- Built-in balance piston
- Reduced axial bearing load
- Suitable for large refrigeration and liquefaction projects
Engineered for Efficiency, Reliability and Flexibility
1.Efficient Rotor Design
Optimized rotor profiles provide stable compression performance and high operating efficiency, especially under low-temperature refrigeration conditions.
2.Flexible Capacity Control
Depending on the model, the compressor supports stepless capacity regulation from 25% to 100%, as well as stepped control at 25%, 50%, 75% and 100%.
3.Adjustable VI
The adjustable internal volume ratio allows the compressor to adapt to different condensing and evaporating conditions, improving efficiency across a wide operating range.
4.Efficient Economizer Design
An optimized economizer gas injection structure improves refrigeration capacity and system efficiency in low-temperature applications.
5.Optimized Oil Circuit
The oil circuit is designed to provide reliable lubrication and cooling for bearings, rotors and the mechanical shaft seal.
6.Reliable Mechanical Seal
The hydraulically balanced shaft seal design uses oil cooling to maintain a stable sealing condition and reduce the risk of refrigerant leakage.
7.Corrosion-Resistant Components
Selected components resist corrosion for longer service life.
8.Elastic Coupling
The flexible coupling tolerates installation deviations, helps simplify alignment and improves transmission reliability.
Ready to Transform Your Operations?
Compact RGII Design for Easier System Integration
The RGII-200 and RGII-410 compressors use an integrated coupling housing that connects the compressor and motor in a compact structure. This configuration reduces installation space, simplifies alignment and improves overall unit stability.
Compact Structure
The integrated compressor and coupling housing reduce the footprint and simplify equipment installation.
Optimized Shaft Seal Cooling
Improved oil supply and return channels provide more uniform cooling around the shaft seal, helping extend its service life.
Optimized Internal Flow
Redesigned internal casting passages improve refrigerant flow and reduce unnecessary pressure losses.
Multiple Drive Configurations
RGII compressors are available with conventional asynchronous motors or permanent magnet variable-frequency motors, allowing manufacturers and system integrators to select the most suitable solution for their equipment.
IM Configuration
The IM version combines the compressor with a conventional three-phase asynchronous motor.
- Mature motor technology
- Simple system integration
- Reliable continuous operation
- Suitable for standard refrigeration applications
IPM Configuration
The IPM version combines the compressor with a permanent magnet variable-frequency motor and inverter.
- Compact all-in-one design
- High efficiency under full and partial loads
- Wide variable-speed operating range
- Reduced equipment length and weight
- Improved system energy efficiency
Large-Capacity Performance
Built for Large Industrial Refrigeration Systems
The RGII large-capacity series is designed for refrigeration systems requiring high displacement, demanding operating conditions and long-term continuous operation.
Large Displacement
The RGII large-capacity series provides theoretical displacement up to 5,201 m³/h, making it suitable for centralized refrigeration plants and large process cooling systems.
Automatic Vi Adjustment
The compressor automatically adjusts its internal volume ratio according to actual operating conditions, helping reduce under-compression or over-compression losses.
Built-In Balance Piston
The balance piston helps offset axial rotor forces under demanding operating conditions, reducing bearing load and supporting longer bearing life.
Wide Capacity Range
RG Series Specification Table
| Model | RG-200 | RG-410 | RG-620 | RG-830 | RG-1150 | RG-1270 |
| Displacement (m³/h) 50Hz | 190 | 402 | 612 | 816 | 1146 | 1268 |
| Capacity Adjustment Control Range | 25–100% | |||||
| Vi Control Range | 2.6–5.1 | 2.6–5.6 | ||||
RGII Series Specification Table
| Model | RGII-200 | RGII-410 | RGII-620 | RGII-830 | RGII-1800 | RGII-2280 | RGII-2850 |
| Nominal Series | 125 | 160 | 200 | 250 | |||
| Male Rotor Rotation (r/min) | 2960 | ||||||
| Displacement (m³/h) 50Hz/60Hz | 212/254 | 417/500 | 622/746 | 832/998 | 1761/2113 | 2270/2724 | 2851/3421 |
| Capacity Range | 50% / 75% / 100% | Stepless 25%–100% or Step 25%, 50%, 75%, 100% | Stepless 25%–100% | ||||
| Vi Range | 2.6–3.5 | 2.6–3.5 | VI Automatic Adjustment: 2.6–4.8 | VI Automatic Adjustment: 2.6–5.6 | |||
| Suction Diameter (mm) | Φ89 | Φ108 | Φ133 | Φ300 | |||
| Discharge Diameter (mm) | Φ60 | Φ89 | Φ108 | Φ219 | |||
| Economizer (mm) ECO | Φ22 | Φ27 | Φ27 | Φ50 | Φ65 | ||
| Weight (kg) | 210 | 330 | 480 | 520 | 1600 | 1720 | 1900 |
Note: Specifications may vary according to refrigerant, operating conditions and configuration. Please contact us for model selection and detailed performance data.
Applications Across Industrial Refrigeration
Blast Freezing
Cold Storage
Process Cooling
Natural Gas Liquefaction
Professional Compressor Selection Support
Selecting the correct compressor requires a detailed evaluation of the refrigerant, evaporating temperature, condensing temperature, cooling capacity, motor power and system operating range. Our technical team can help you select the appropriate compressor model and configuration based on your actual project requirements.
Please provide:
- Required cooling capacity
- Refrigerant
- Evaporating temperature
- Condensing temperature
- Power supply
- Motor configuration
- Capacity regulation requirements
- Application type
- Installation environment
Note: Motor selection should be based on the maximum expected power under extreme operating conditions, while maintaining an appropriate safety margin. Partial-load control may be considered when overload could occur under extreme operating conditions.
Why Choose Us
Your Reliable Partner for Industrial Refrigeration
Selecting the correct compressor requires a detailed evaluation of the refrigerant, evaporating temperature, condensing temperature, cooling capacity, motor power and system operating range. Our technical team can help you select the appropriate compressor model and configuration based on your actual project requirements.
Wide Product Range
Multiple compressor sizes are available for small refrigeration units, medium-sized industrial systems and large centralized refrigeration plants.
Flexible Configuration
Choose from standalone compressors, conventional motor packages or permanent magnet variable-frequency integrated units.
Engineering Support
Professional support is available for model selection, operating condition analysis and system configuration.
Industrial Reliability
Designed for demanding low-temperature applications and long-term industrial operation.