Industrial Single Screw Compressors

A single screw compressor uses one main rotor with two opposing gate rotors to compress gas. This balanced design creates equal and opposite forces that cancel each other out, resulting in minimal bearing loads and vibration. Twin screw compressors use two intermeshing rotors that create unbalanced axial and radial forces, leading to higher bearing loads, increased vibration and more frequent maintenance. The single screw design allows independent control of capacity and volume ratio through dual slide valves, while twin screw designs typically require variable frequency drives to achieve similar efficiency at part load. 

Vilter single screw compressors excel in industrial refrigeration (cold storage, food processing, ice rinks), renewable natural gas compression (landfill gas, digester gas) and industrial heat pump applications (district heating, process heating). The technology is particularly well-suited for applications requiring high reliability, efficient part-load operation, compatibility with natural refrigerants and minimal maintenance. The balanced design handles high-pressure operation up to 2,000 PSI or 138 bar, making it ideal for transcritical CO₂ systems and heat pump applications requiring elevated discharge temperatures.

Parallex slide valves provide independent control of capacity (10-100%) and volume ratio (1.2-7.0), allowing the compressor to match both flow requirements and compression ratio to actual operating conditions. This eliminates over-compression and under-compression losses that waste energy. The system automatically adjusts to maintain peak efficiency across the full load range without the complexity, cost and potential efficiency penalties of variable frequency drives. This design advantage can deliver up to 15% energy savings compared to twin screw alternatives. 

Vilter single screw compressors are engineered for natural refrigerants including ammonia (R-717), subcritical CO₂ and transcritical CO₂ (R-744). These refrigerants offer zero global warming potential and support sustainability goals while delivering excellent thermodynamic performance. The robust construction and balanced design handle the demanding operating conditions associated with natural refrigerants, including high pressures in transcritical CO₂ and heat pump applications. 

The balanced design minimizes bearing loads, allowing the first bearing inspection at 120,000 hours (approximately 15 years of continuous operation). This extends maintenance intervals and reduces lifecycle costs compared to twin screw compressors that typically require major overhauls every five years. The single screw design allows in-place servicing without removing the compressor from the system. Fewer moving parts and lower component stress result in reduced maintenance requirements and higher uptime across the equipment lifecycle.

Sizing requires defining the required capacity, operating temperature range (evaporating and condensing temperatures), refrigerant type and duty cycle. Ambient conditions, load variations and whether the application requires continuous or intermittent operation are also considered. The Parallex slide system provides wide operating flexibility, but proper sizing ensures the compressor operates in its most efficient range. Copeland's technical team and online selection tools help validate the match between application requirements and compressor capabilities. 

Copeland offers industry-leading warranty coverage for Vilter single screw compressors: 5 years on compressor internal parts and 15 years on all compressor bearings. This extended bearing warranty reflects the durability advantages of the balanced single screw design and demonstrates Copeland's confidence in long-term reliability. The warranty provides added assurance for facilities prioritizing lifecycle value and predictable operating costs.

Technical documentation, performance data and selection support are available through the Online Product Information (OPI) tool. The Copeland Mobile app provides quick access to product information and resources from mobile devices for field reference. For application-specific guidance and system design support, contact Copeland's technical team through the contact form on this page.

Prepare details about the application including refrigerant type, required capacity (tons or kW), operating temperatures (evaporating and condensing), ambient conditions, duty cycle (continuous or intermittent) and any special requirements such as high-pressure operation or heat recovery. Information about existing system architecture, electrical supply and space constraints helps technical specialists provide accurate recommendations. If replacing existing equipment, model numbers and performance data from current compressors provide useful reference points.

Single screw compressors support sustainability through multiple pathways. Compatibility with natural refrigerants (ammonia, CO₂) enables zero global warming potential refrigeration and heat pump systems. Superior part-load efficiency reduces energy consumption and associated carbon emissions. The balanced design and extended maintenance intervals minimize resource consumption over the equipment lifecycle. In heat pump applications, the technology enables facilities to reduce fossil fuel consumption and transition to electrified heating with coefficient of performance values exceeding conventional boiler systems by three to five times. 

Copeland maintains a global presence with technical support, service capabilities and distribution networks across North America, Europe, Asia Pacific and other regions. Factory-trained service technicians, genuine OEM parts availability and regional technical specialists support installations worldwide. The company's experience spans diverse regulatory environments and application requirements across global markets. Regional nuances in product offerings and support capabilities are addressed through local Copeland representatives.

The robust construction and balanced design of Vilter single screw compressors provide reliable operation across wide ambient temperature ranges. Transcritical CO₂ platforms are specifically engineered for demanding ambient conditions where conventional systems struggle. The Parallex slide system automatically adjusts to maintain efficiency as operating conditions change. Proper system design, including adequate heat rejection capacity and appropriate controls, ensures stable performance in extreme climates. Copeland's application engineering team provides guidance for installations in challenging environmental conditions.