Huitengda is a China-based manufacturer and supplier of oil-free air compressors, producing single-stage and two-stage models in integrated and split structures at its facility in Chengyang District, Qingdao. The range covers air-cooled and water-cooled configurations and multiple pressure and flow specifications for processes that require oil-free compressed air. All units pass full-load aging tests before shipment.
Water-lubricated oil-free air compressors are our key products with integrated and split types.
How Water-Lubricated Oil-Free Compression Works
In a water-lubricated oil-free screw compressor, water performs the sealing, lubrication and cooling functions inside the compression chamber instead of oil. No oil enters the air path, so the compressed air is oil-free at the source rather than oil-free after filtration. There is no oil sump and no oil carryover to remove downstream. The design produces low temperature rise, stable pressure, low vibration and low noise, and supports long-hour continuous operation.
Product Detail
Oil-free air compressors deliver 100% oil-free compressed air, eliminating oil contamination risk to protect products and downstream equipment. Water-lubricated design brings low temperature rise, stable pressure, low vibration and low noise, suitable for long-hour continuous operation.
We provide single-stage and two-stage water-lubricated oil-free models in integrated and split structures, covering various pressure and flow specifications to meet high air purity demands.
Main configurations: water-lubricated rotor assembly, permanent magnet VSD motor, PLC intelligent control system and high-efficiency heat exchanger. All units pass full-load aging tests before shipment.
Supply scope: Besides compressor main units, we supply air tanks, refrigerated dryers and precision filters. Our one-stop air source system service covers solution planning, pipeline design, installation, commissioning, training and after-sales support.
Air-Cooled vs. Water-Cooled
Air-cooled units include their own cooling fan and require no external cooling water, making them suitable for most standard workshops and simpler to install. Water-cooled units use a water-cooled heat exchanger, occupy more floor space and provide stronger heat dissipation for high ambient temperatures and large motors running continuously.
Applications
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Food and beverage production, where air may contact product or packaging
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Pharmaceutical manufacturing and cleanroom environments
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Electronics and semiconductor assembly, including SMT and precision component handling
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Medical device and instrument processing
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High-end sheet metal work and optical lens production
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Laboratories and new energy processes with strict gas purity requirements
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Textile and other sectors where oil contamination affects finished products
How to Choose the Right Oil-free Air Compressors
Air purity standard. Define the required cleanliness level for the process first; oil-free compression is specified where oil contamination cannot be removed from the finished product.
Air demand. Calculate peak flow, then add pipeline pressure drop and filter resistance before fixing displacement and pressure grade. Undersizing reduces component life and stable operation.
Pressure and stages. Two-stage models suit higher pressure at sustained flow, using series low- and high-pressure air ends with inter-stage cooling to reduce temperature rise and internal leakage. Single-stage models are the more economical specification where pressure demand is moderate.
Layout and cooling. Integrated units save floor space and simplify installation. Split units give better maintenance access and heat dissipation, particularly for water circuit servicing or poorly ventilated rooms. Choose air-cooled or water-cooled according to ambient temperature, motor size and available cooling water.
Water supply. Confirm water quality, treatment needs and maintenance access before ordering.
Warranty and Service
Oil-free air compressors carry a 1-year whole-machine warranty covering free repair and spare parts for manufacturing defects. Consumables, damage from improper operation, abnormal power supply, poor water quality and harsh operating conditions are excluded.
Services include air demand assessment, post-treatment matching, pipeline design, on-site installation, commissioning, operator training and after-sales technical support for customers in China and overseas. Post-treatment equipment including air tanks, refrigerated dryers and precision filters can be supplied as part of a complete air source system.
Water Quality Requirements
Water-lubricated oil-free compressors require a stable supply of clean water at consistent quality. Water hardness, conductivity and contamination levels directly affect rotor surfaces, the heat exchanger and overall service life; hard or untreated water causes scaling that reduces efficiency. Before selection, confirm the site water source and whether pre-treatment or a closed-loop purification circuit is required, and plan how the water circuit will be serviced. Water quality falls outside the warranty, so this should be resolved at the specification stage.
FAQ
Is a water-lubricated compressor genuinely oil-free?
Yes. Water replaces oil for sealing, lubrication and cooling inside the compression chamber. No oil enters the air stream, and there is no oil carryover to filter out.
Is water treatment required?
Yes. A stable supply of clean water at consistent quality is required. Untreated or hard water causes scaling that reduces efficiency and shortens service life.
Which industries require oil-free air?
Food processing, pharmaceutical production, electronics and semiconductor manufacturing, medical device processing, optical and precision surface work, laboratories and new energy processes.
Can oil-free compressors run 24 hours continuously?
Yes. Heavy-duty water-lubricated oil-free models are designed for long-hour continuous operation with low temperature rise, low vibration and low noise.
What is the difference between oil-free and oil-injected compressors?
Oil-injected compressors retain trace oil in the air stream even with coalescing filters. Oil-free units deliver zero-oil air at the source for high-purity requirements.
Are integrated models available?
Yes. Both integrated and split structures are available. Integrated models save workshop space and simplify installation; split models improve maintenance access and heat dissipation.
What pressure options are available?
Single-stage and two-stage water-lubricated oil-free models are available across medium and high pressure specifications. Selection depends on process pressure, flow demand and pipeline pressure loss.
What technical support is provided?
Engineers provide on-site assessment, system planning and technical guidance covering air demand, equipment selection, pipeline design, installation, commissioning and operator training.
