Oil-free screw compressor-Kimairtec Co., Ltd. - The Power Source of Air Compressors

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Oil-free screw compressor

Discover our screw air compressors, designed for a wide range of applications, and leverage the expertise of our compressed-air specialists to find the right screw air compressor for your needs.

Reliable and quiet continuous operation

Designed for 24/7 operation, it delivers exceptionally low noise—approximately 60 dBA—ensuring stable performance without compromising the working environment.

Higher efficiency

Compared with reciprocating compressors, they deliver higher efficiency, providing outstanding performance while minimizing energy consumption—especially when equipped with our VSD technology, which dynamically adjusts to real-time demand, reducing operating costs by up to 60%.

Longer service life

Screw-type air compressors feature a robust, durable design that results in fewer breakdowns and lower maintenance requirements, making them a reliable long-term investment.

Screw air compressors are designed to meet the diverse needs of users across many industries and applications. They compress the air flowing through the compressor by means of two screws that rotate in opposite directions.

This type of equipment can operate continuously 24 hours a day, seven days a week, with low operating noise (approximately 60 dBA) and the ability to efficiently produce compressed air. Compared with reciprocating compressors, these units are more efficient and have a longer service life, making them an ideal long-term investment for numerous industries.

Please refer to our compressor selection guide to find the compressor that meets your needs.

Learn about our oil-free screw compressors for sale:

KAG Series Pneumatic zero air-loss drain

The KIMAIR KAG Series is a pneumatic, zero air-loss automatic condensate drain specifically designed for compressed air system components such as filters, refrigerated air dryers, and air receiver tanks. The series utilizes a unique float-operated liquid level control principle, enabling "on-demand draining" based on the actual volume of condensate produced—draining only water, not air, fundamentally eliminating compressed air waste. The KAG Series requires no electrical power and can be safely used in hazardous environments such as flammable or explosive areas. It is the ideal auxiliary equipment for energy-saving, safe, and reliable compressor stations and piping networks.

KIMAIR KYF Series Compressed Air Filters (1.6MPa)

The KYF series is manufactured via precision casting of high-strength aluminum alloy and is rated for a working pressure of 1.6 MPa. This series excels in lightweight design, corrosion resistance, and thermal dissipation, offering five filtration grades—C, T, A, H, and F—making it an ideal filtration solution for mobile equipment, space-constrained environments, and applications subject to high vibration.

KIMAIR KXY Series Industrial-Grade Exhaust Mufflers

The KXY Series is an environmental protection device installed at the outlet port of air compressors and pneumatic components. Using high-efficiency filter media and silencing structures, it not only reduces exhaust noise by 18-30dB(A) but also effectively captures oil mist and particles carried in the exhaust, purifying workshop air, protecting employee health, meeting environmental regulatory requirements, and achieving a green, low-noise factory environment.

KIMAIR KZD Series Intelligent Zero Air Loss Condensate Drains

The KZD Series represents an innovation in drain technology, using intelligent liquid level sensing and pilot-operated diaphragm valves to achieve "drain only when water is present, stop immediately when drained" with zero compressed air consumption. Compared to timed drains, it operates precisely based on actual accumulated water, ensuring absolute equipment dryness while eliminating the energy waste caused by timed drains' periodic air exhaust.

KIMAIR KET Series Electric Timer Auto Drain Valves

The KET Series is an intelligent automatic drain device integrating an electronic timer controller and a solenoid valve. It automatically drains accumulated condensate from compressed air systems at regular intervals based on flexibly settable drain duration and intervals, completely replacing inefficient and failure-prone manual drains, ensuring system dryness, and preventing equipment corrosion and water hammer damage. It is an essential component for standardization and automation of modern industrial air source systems.

KIMAIR KOWS Series Condensate Separators

The KOWS Series is an environmental protection device professionally designed to treat oily condensate generated by compressed air systems. Through multi-stage physical adsorption and filtration, it efficiently separates oil from hazardous waste, enabling the treated water to meet national or local environmental direct discharge standards, helping enterprises discharge compliantly, reduce hazardous waste treatment costs, and fulfill environmental responsibilities.

KIMAIR KAWS Series Water Separators (1.6 MPa)

The KAWS Series is a high-efficiency air-water separator based on centrifugal separation principle, with a working pressure of 1.6MPa. Using physical cyclone technology without any filtration consumables, this series efficiently removes ≥95% of liquid water and solid particles >5μm from compressed air. It is an ideal pre-treatment device for protecting downstream precision filters, dryers, and equipment, significantly extending the service life of core purification equipment.

KIMAIR KSHF Series Stainless Steel High-pressure Air Filters (2.0-6.0MPa)

The KSHF Series is a stainless steel precision filter designed for severe high-pressure conditions, with a working pressure range of 2.0-6.0MPa. Manufactured from 316L stainless steel and certified to ASME BPVC Section VIII, it offers six filtration grades (C/T/A/H/F/FF) and is a professional filtration device for petrochemical, high-pressure testing, special process, and other fields.

KIMAIR KCF Series Carbon Steel High-pressure Precision Filters (2.0-6.0MPa)

The KCF Series is an economical high-pressure filtration solution, manufactured from high-quality carbon steel with a working pressure range of 2.0-6.0MPa. While ensuring high-pressure filtration performance, it controls costs through optimized design and mature processes, providing a reliable choice for users with limited budgets who need high-pressure filtration. It is a practical product for the petroleum, mining, and general industrial fields.

KIMAIR KSF Series Stainless Steel Air Filters (1.6 MPa)

The KSF Series is a precision filter manufactured from high-quality stainless steel (304/316L) with a rated working pressure of 1.6MPa. This series is specifically designed for industries with stringent corrosion resistance and cleanliness requirements such as food, pharmaceutical, and electronics, offering five filtration grades (C/T/AA/H/F) to achieve full-process purification from primary water removal to ultra-fine filtration, serving as a core component for building high-standard, high-reliability compressed air systems.

KIMAIR KF Series Compressed Air Filters (1.0MPa)

The KF Series is a general-purpose precision filter manufactured from high-quality carbon steel with a working pressure of 1.0MPa. This series offers four filtration grades (C/T/A/H), delivering excellent cost performance and reliable performance to meet the compressed air purification needs of most industrial scenarios, making it an ideal choice for building economical compressed air purification systems.

KIMAIR KZ Series Lubricating Oils

The KZ Series is a high-performance lubricating oil product system from KIMAIR for air compressors. This series incorporates technology specifications and materials science, adopting strict supply chain and formulation management, providing complete solutions from premium semi-synthetic to fully synthetic. By precisely matching the operating conditions of different compressors, the KZ Series is dedicated to achieving excellent anti-wear protection, outstanding thermal and oxidation stability, and optimized oil service life, providing core protection for reliable, efficient, and long-life compressor operation, comprehensively reducing the user’s total equipment operating cost.

KIMAIR K Series Oil-air Separator Elements

The KIMAIR K Series oil separator element (referred to as "separator element") is a core consumable component of screw air compressors, professionally installed inside the compressor's oil separator tank. Its core function is to efficiently separate the oil-air mixture discharged from the airend, reducing the oil content in the compressed air to an extremely low level (as low as ≤3 ppm), while ensuring that the separated lubricating oil returns cleanly to the oil circuit for reuse. As a key consumable requiring regular replacement, its performance directly affects compressed air quality, equipment energy consumption, and operating costs.

KIMAIR K Series Oil Filters

The K Series oil filter is a core protective component specifically designed for the lubrication system of oil-injected screw air compressors. It contains a high-precision filter element that removes impurities, wear metal particles, and some gelatinous substances generated during lubricating oil circulation, maintaining oil cleanliness and effectively protecting the airend bearings, gears, and rotors, ensuring efficient, smooth, and long-life operation. Regular oil filter replacement is one of the most important maintenance tasks for oil-injected screw air compressors.

KIMAIR K Series Air Filter Elements

The KIMAIR K Series Air Filter Element is a high-quality consumable filter specifically designed for KIMAIR air compressor systems. Installed inside the air filter assembly, it filters dust, particles, and other impurities from the air entering the compressor. When the equipment has been running for approximately 2000 hours (or based on actual working environment conditions), this filter element needs to be replaced promptly to ensure efficient and stable compressor operation and extend the service life of core components.

KIMAIR KDHBZ Series Economy Heated Blower Purge Desiccant Dryers

The KIMAIR KDHBZ series blower purge heat regenerative dryer utilizes zero-purge regeneration technology with a blower and external heater, completely overcoming the limitation of traditional adsorption dryers that consume compressed air. By drawing in ambient air for heating and regeneration, it achieves deep drying with zero compressed air consumption, delivering a stable pressure dew point from -40℃ to -70℃, providing the ultimate energy-saving solution for users highly sensitive to energy costs.

KIMAIR KDHL Series Heatless Desiccant Dryers

The KIMAIR KDHL Series Heatless Desiccant Dryer utilizes Pressure Swing Adsorption (PSA) principles, using a portion of the dried air to regenerate the desiccant without needing an external heat source. It delivers deeply dried air with pressure dew points reaching -40°C or even -70°C, making it the key solution for eliminating trace moisture vapor in compressed air, suitable for applications with extreme requirements for air dryness.

KIMAIR KDH Series Heated Desiccant Dryers

The KIMAIR KDH Series Heated Desiccant Dryer integrates intelligent heated regeneration technology into the traditional heatless drying process. By using a small amount of electrical energy to precisely heat the regeneration gas, it significantly reduces regeneration air consumption. While maintaining a deep drying capability of -40°C to -70°C pressure dew point, this series achieves a 40-50% reduction in regeneration air consumption, making it a highly efficient solution that balances deep drying performance with operational economy.

KIMAIR KRH Series High-temperature Refrigerant Air Dryers

The KIMAIR KRH series is a refrigerated air dryer specifically designed for high-temperature intake conditions, capable of stably treating compressed air with inlet temperatures up to 80°C. Through a reinforced refrigeration system and a unique two-stage precooling design, it effectively addresses the drying challenges posed by high-temperature compressor discharge or hot environments, ensuring a stable pressure dew point under harsh conditions and protecting downstream production systems.

KIMAIR KDR Series Refrigerant Air Dryers

The KIMAIR KDR Series represents an innovation in energy efficiency for refrigeration drying technology. It utilizes a high-efficiency aluminum brazed plate-fin heat exchanger, which, compared to traditional shell-and-tube heat exchangers, achieves over 35% higher heat transfer efficiency. While providing the same stable dew point (e.g., +3°C), it delivers lower operating energy consumption and a more compact body design. The KDR Series is the ideal choice for users pursuing superior energy efficiency and long-term operational economy.

KIMAIR KR Series Refrigerant Air Dryers

The KIMAIR KR Series is a refrigerated air dryer utilizing classic shell-and-tube heat exchange technology. Through a stable refrigeration cycle, it cools compressed air to a pressure dew point between +2°C and +10°C. As the core drying equipment in compressed air treatment systems, the KR Series is widely used in general industrial applications due to its reliable construction, easy maintenance, and economical characteristics, effectively removing moisture from compressed air to protect downstream equipment and production processes.

KIMAIR i-Air System

The KIMAIR i-Air System is a cloud-based remote monitoring and service platform for compressed air systems. It serves as an extension of the AIRMATICS control system into the cloud, or operates independently to service KIMAIR smart devices connected to the network. It provides users, service engineers, and managers with a digital work platform unrestricted by location. Its core value lies in achieving equipment transparency, proactive service, and scientific management.

KIMAIR AIRMATICS Control System – The "Smart Brain" of Compressed Air in the Industry 4.0

KIMAIR AIRMATICS™ is a future-proof, cloud-based intelligent control system designed to transform your factory's compressed air system from an isolated, reactive "power unit" into an interconnected, intelligent, and highly efficient "Smart Energy Network." As an essential component for achieving Industry 4.0, it utilizes a "Cloud-Edge-Device" collaborative architecture to break down brand barriers, seamlessly integrating air compressors from any manufacturer. It provides 24/7 monitoring, AI-driven autonomous decision-making, and deep energy optimization, serving as the core engine for the digital and intelligent transformation of your power system.

KIMAIR Smart Control System

KIMAIR Intelligent Control System is a professional compressed air system control solution integrating advanced industrial IoT technology. With a high-performance intelligent controller at its core, combined with a cloud management platform, it provides users with comprehensive management capabilities ranging from precise single-machine control to intelligent multi-machine coordination, and from local operation to remote monitoring. It aims to automate, visualize, and optimize the operation of compressed air systems, significantly improving energy efficiency and reliability, serving as the standardized and intelligent brain for modern smart air compressor stations.

KIMAIR KSD Skid-mounted Diesel-driven Screw Air Compressors

The KSD series is a truly "self-sufficient" independent power station, integrating a high-power diesel engine, high-efficiency oil-flooded screw airend, cooling system, and intelligent control unit onto an ultra-robust skid. Without any external power supply, it relies solely on diesel to provide stable industrial compressed air anywhere in the world. It is the ultimate power solution for oil and gas exploration, emergency rescue, large-scale construction in areas without electricity, and other demanding environments, enabling "power wherever you go, without limits."

KIMAIR KDHP Diesel-driven Portable Screw Air Compressors (Large)

The KDHP series is the "power giant" within KIMAIR's diesel-powered portable air compressor product line. Designed for extreme, high-load conditions such as large-scale open-pit mining, heavy-duty infrastructure construction, and deep, long tunnels, the KDHP series features a high-power turbocharged diesel engine and a high-performance heavy-duty airend. With its large free air delivery (FAD) and unparalleled continuous operation capability, it serves as the core power source and productivity foundation for major engineering projects.

KIMAIR KDP Diesel-driven Portable Screw Air Compressors (Medium)

The KDP (Medium) series is the mainstream model for mainstream earth-rock works, mine auxiliary operations, and medium-sized infrastructure projects. It perfectly balances power, air volume, mobility, and economy, providing stable, reliable medium free air delivery suitable for most breaking, drilling, tamping, and similar operation scenarios. Known for its comprehensive applicability, high reliability, and excellent price/performance ratio, it is a widely recognized and chosen classic model in the market.

KIMAIR KDP Diesel-driven Portable Screw Air Compressors (Small)

The KDP (Small) series is the agile pioneer in KIMAIR's diesel-powered Portable Air Compressor family, specifically designed for small-scale operations, municipal maintenance, and space-constrained sites. It integrates a high-efficiency, low-consumption diesel engine, a reliable Oil-Flooded Compressor screw airend, and a compact chassis. With its light weight, rapid deployment capability, and excellent economy, it is a trustworthy independent power partner for municipal projects, small contractors, and maintenance teams.

KIMAIR BOV Oil-free Inverter Screw Blowers

The BOV series is a high-efficiency oil-free blower developed by KIMAIR using advanced twin-screw technology. It abandons the contact-based compression principle of traditional Roots blowers, employing a non-contact meshing screw airend and intelligent Variable Speed Drive (VSD). It delivers high flow, pulse-free clean air at low pressure (typically <0.5 BarG). It completely solves the industry pain points of Roots blowers—low efficiency, high noise, and frequent maintenance. It is a revolutionary product for energy-saving upgrades and process improvements in applications like wastewater treatment, aquaculture, and pneumatic conveying.

KIMAIR KORW Series Medium-pressure Oil-free Reciprocating Air Compressors

The KORW series is a medium-pressure, oil-free reciprocating air compressor meticulously crafted by KIMAIR, inheriting classic designs and specifically engineered for the PET bottle blowing industry. It utilizes a proven L-type, two-cylinder, water-cooled structure to achieve 100% oil-free compression, delivering a stable, pure medium-pressure air source of 1.6-2.5 MPa. Renowned for its robust durability, intuitive maintenance, and controllable long-term operating costs, this compressor is deeply trusted by bottle blowing manufacturers who prioritize reliability and return on investment. It is a true, enduring "workhorse" of the industry.

KIMAIR PHE Series Medium-pressure Two-stage PM Motor Inverter Rotary Screw Air Compressors

The PHE series represents the pinnacle of medium-pressure air compressor technology, deeply integrating "Two-Stage Compression" with "Permanent Magnet Variable Frequency Drive." It is specifically designed for higher pressures of 1.4-1.6 MPa or for medium/high-pressure applications with extreme demands for energy efficiency. Through staged compression and intercooling, it significantly reduces the single-stage compression ratio and discharge temperature, achieving a revolutionary energy efficiency breakthrough and exceptional reliability in the high-pressure range. It is the ultimate choice for high-end medium-pressure applications, meeting the most stringent industrial demands.

KIMAIR PHS Series Medium-Pressure PM Motor Inverter Rotary Screw Air Compressors

The PHS series is KIMAIR's high-efficiency energy-saving solution for medium-pressure applications in the 1.5-1.6MPa range. It integrates an IE5 permanent magnet synchronous motor with a screw airend specifically optimized for medium-pressure conditions. Combined with intelligent variable speed drive, it accurately matches the air demand of medium-pressure processes such as PET blow molding, gas boosting, and industrial cleaning. While providing a stable medium-pressure air source, it achieves energy efficiency far exceeding traditional medium-pressure piston or fixed-speed screw compressors, making it the preferred choice for energy-saving upgrades in the medium-pressure field.

KIMAIR PLE Series Two-Stage Low-Pressure PM Motor Inverter Rotary Screw Air Compressors

The PLE series is the flagship model in KIMAIR's low-pressure product line, integrating three core technologies: "Two-Stage Compression," "Permanent Magnet Variable Speed," and "Low-Pressure Optimization." Designed to deliver unparalleled energy efficiency and reliability for the world's most challenging large-scale, high-differential-pressure, variable low-pressure applications, it is the true "Crown Jewel of Low-Pressure Power," engineered specifically to redefine industry energy standards.

KIMAIR PLS Series Low-Pressure PM Motor Inverter Rotary Screw Air Compressors

The PLS series applies permanent magnet variable speed technology, a top-tier energy-saving solution, to the low-pressure field, making it a groundbreaking product for achieving ultimate low-pressure energy efficiency. Featuring an IE5 ultra-high efficiency permanent magnet synchronous motor and a specially optimized airend for low-pressure, high-volume applications, it maintains leading energy efficiency even in low-pressure conditions. For high-volume air users who rely on compressed air as a primary power cost, the PLS is a strategic weapon to reduce the unit cost of air generation and build a green competitive advantage.

KIMAIR ELV Series Two-Stage Low-Pressure Inverter Rotary Screw Air Compressors

The ELV series represents the pinnacle of low-pressure compressor technology, deeply integrating the high efficiency of two-stage compression, the high flow rate of low-pressure systems, and the precision of inverter control. Specifically designed for ultra-large, complex, variable-load low-pressure industrial systems with extreme energy efficiency demands, it delivers unmatched stability, efficiency, and economy across the full operating range. It is the strategic choice for building modern large-scale low-pressure power centers.

KIMAIR SLV Series Low-Pressure Inverter Rotary Screw Air Compressors

The SLV series is the perfect combination of low-pressure technology and intelligent inverter control. Built on the high-efficiency SLI low-pressure platform, it integrates advanced Variable Speed Drive (VSD) technology, enabling the Free Air Delivery (FAD) to match fluctuating low-pressure air demand in real time, completely eliminating waste caused by load changes. The SLV offers unparalleled flexibility, stability, and energy savings for low-pressure applications, making it a benchmark product for intelligent upgrades in low-pressure systems.

KIMAIR ELI Series Two-Stage Low-Pressure Rotary Screw Air Compressors

The ELI series introduces efficient Two-Stage Screw Compressor technology to the low-pressure segment, providing the ultimate solution for low-pressure applications with higher demands for air volume and efficiency. Through two-stage compression and Intercooler cooling, it achieves significantly greater Free Air Delivery [FAD], lower Specific Power, and superior operational stability while maintaining low-pressure output. It is the core energy-efficiency equipment for large-scale low-pressure air systems.

KIMAIR SLI Series Low-Pressure Rotary Screw Air Compressors

The SLI series is a Low Pressure Screw Air Compressor designed by KIMAIR specifically for high-volume, low-pressure air demand applications. By optimizing the Airend rotor profile, flow channels, and control system, it delivers significantly higher Free Air Delivery [FAD] and superior operational efficiency at working pressures of 0.3-0.5 MPa. It perfectly meets the specific low-pressure process air requirements of industries such as textiles, glass, and chemicals, making it an ideal energy-saving alternative to traditional Roots Blowers or high-pressure compressors used with Pressure Drop via throttling.

KIMAIR FSAL Series Laser Cutting Machine PM Motor Inverter Rotary Screw Air Compressors

The FSAL series is an integrated air solution specifically developed by KIMAIR for high-precision laser cutting equipment. It integrates a high-efficiency Permanent Magnet (PM) motor airend, a high-performance filtration system, and an intelligent control unit into one unit. It aims to provide continuously stable, dry, and clean high-quality compressed air for laser cutting. Its exceptional pressure stability and air purification capabilities effectively protect the laser optics, improve cut surface quality, and ensure equipment availability. It is key equipment for the metal processing industry to enhance competitiveness and profitability.

KIMAIR KOS Series Oil-free PM Motor Inverter Rotary Screw Air Compressors

The KOS series represents the pinnacle of KIMAIR's oil-free technology, integrating three major advanced technologies: "oil-free dry-type," "Permanent Magnet Motor (PM Motor)," and "Variable Speed Drive (VSD)." It provides a globally leading "ultra-efficient, high-purity air" solution. Ensuring the highest safety standard of 100% oil-free contamination prevention, it achieves ultimate energy efficiency, making it the ultimate air source tailored for top-tier manufacturing and advanced scientific research.

KIMAIR KOV Series Oil-free Inverter Rotary Screw Air Compressors

Building on the proven oil-free dry-type technology of the KOE series, the KOV series integrates intelligent Variable Speed Drive (VSD). It not only delivers 100% oil-free compressed air but also enables demand-oriented supply through variable speed control. This perfectly solves the issue of lower part-load efficiency typical of oil-free compressors. The KOV series is an efficient and intelligent choice for premium applications that demand both absolute air quality and energy efficiency.

KIMAIR KOE Series Oil-free Rotary Screw Air Compressors

The KOE series is KIMAIR’s dry oil-free screw air solution for industries with stringent air quality requirements. Featuring a completely oil-free design, precision synchronous gear transmission, and specialized dry sealing technology, the KOE series ensures 100% oil-free compressed air, meeting the highest ISO 8573-1 Class 0 (2010) standard. It is a trusted power source for industries such as Food & Beverage, Pharmaceutical, and Electronics & Semiconductor.

KIMAIR FS Series PM Motor Inverter Rotary Screw Air Compressors

The FS series is a cost-effective permanent magnet variable speed screw air compressor launched by KIMAIR for small and medium-sized enterprises and the general industrial market. Built on the core technology of permanent magnet variable speed drives and a reliable single-stage airend, this series has been precisely optimized for cost. It aims to provide customers who are first-time users of variable speed compressors or those seeking the best value for money with an affordable, high-performance, and energy-saving device. The FS series achieves a balance between high-efficiency technology and an accessible price, making it a practical choice for users looking to upgrade their air station for energy savings and reduce production electricity costs.

KIMAIR PS Series PM Motor Inverter Rotary Screw Air Compressors

The PS Series is KIMAIR's new generation of ultra-high-efficiency permanent magnet variable frequency screw air compressors, equipped with IE5 ultra-premium efficiency permanent magnet synchronous motors and an intelligent variable frequency drive system. It represents the pinnacle of energy efficiency in industrial air compressors. By precisely matching air demand in real time, it eliminates no-load energy consumption, achieving up to 30%-40% energy savings compared to traditional fixed-speed models. It is a strategic choice for building green factories and reducing core power costs.