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Oil-Injected Rotary Screw Air Compressor Factory

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Oil-Injected Rotary Screw Air Compressor Supplier

The Baiao oil-injected air compressor series stands out in the market with its exceptional product features and energy efficiency. These compressors utilize a unique oil injection system that enhances sealing, cooling, and lubrication, thereby improving compression efficiency. Compared to single-stage compressors, our two-stage oil-injected air compressors can achieve significant energy savings of up to 25%. The two-stage compression process reduces the compression ratio of each stage, minimizing internal leakage and increasing volumetric efficiency. This brings lower energy consumption and cost savings to your business.

Baiao two-stage compressors feature imported air ends and are manufactured to the highest standards. Designed for high efficiency and durability, these machines provide you with reliable performance and reduced maintenance costs. Advanced technology ensures the optimal speed of each rotor, further enhancing compression efficiency.

We offer a comprehensive warranty of 1 to 5 years, depending on the model and configuration. We are committed to providing you with better support and service, ensuring your compressor runs smoothly and efficiently for years to come.

Zhejiang Baiao Gas Equipment Co., Ltd.
Zhejiang Baiao Gas Equipment Co., Ltd. is located in Fuyang District, Hangzhou, with convenient location and good transportation access. We are a gas equipment manufacturer integrating R&D, design, production, and installation. As Custom Oil-Injected Rotary Screw Air Compressor Supplier and China Oil-Injected Rotary Screw Air Compressor Factory, Our facility covers a 3,000 sqm standardized workshop, a 500 sqm office area, and a 500 sqm warehouse, along with employee living facilities. Our team is lean and professional, with dedicated R&D and after-sales service personnel to ensure stable production and reliable project execution.
Our main products include gas separation and purification equipment, such as PSA nitrogen generators, PSA oxygen generators, membrane separation nitrogen/oxygen generators, QH/QC series nitrogen purification units, and ammonia decomposition hydrogen purification units. Our products are developed based on overseas technologies and optimized for domestic industrial conditions, offering a relatively complete product range.
Our equipment is used in industries such as petrochemical, textile, food processing, automotive manufacturing, heat treatment, and SMT precision electronics. Our sales network covers more than 30 provinces and cities across China.
We focus on technical improvement, quality control, and integrity in business operations. Relying on our quality management system and sales service system, we provide stable gas equipment and supporting services to customers worldwide.
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Oil-Injected Rotary Screw Air Compressor Industry knowledge

Configuring an Oil-Injected Rotary Screw Compressor

Once oil-injected rotary screw has been chosen as the compression technology, the remaining specification decisions sit within that category: single-stage or two-stage compression, fixed-speed (FSD) or permanent-magnet variable-speed (PM VSD) drive, and standard or high-pressure output. The five models on this page cover different combinations of these three variables.

Single-Stage vs. Two-Stage Compression

A single-stage screw compressor raises air to final pressure in one compression step. A two-stage design splits the same pressure rise across two rotor sets in series, so each stage handles a smaller compression ratio. A lower compression ratio per stage reduces internal leakage past the rotors and keeps the air cooler between stages, which is why two-stage models are generally the more efficient option at a given output pressure — Baiao's own two-stage series is published as achieving energy savings of up to 25% compared with an equivalent single-stage unit. The trade-off is a mechanically more complex machine, which is typically justified once a compressor runs close to continuous duty rather than intermittently.

PM VSD vs. FSD: What the Drive Type Actually Changes

Several models on this page are offered in both PM VSD and FSD configurations. An FSD (fixed-speed drive) unit runs its motor at one constant speed and unloads excess capacity rather than slowing down, so efficiency drops once demand falls below full load. A PM VSD (permanent magnet variable speed drive) unit uses a permanent-magnet motor that can vary its speed efficiently across a wide range — including at low speed, where a standard induction motor typically loses efficiency — so the compressor can track fluctuating air demand more closely instead of running at fixed output and unloading the surplus. The choice between the two is less about capacity and more about how flat or variable a site's compressed-air demand actually is over a shift.

Standard vs. High-Pressure (20–40 bar) Configurations

Most oil-injected screw compressors on this page are configured for standard low-pressure compressed-air duty. A separate 20–40 bar model is built for applications that need pressure well above typical plant air — for example, PET bottle blowing, pipeline/valve testing, or feeding a downstream process that requires elevated pressure directly, rather than boosting standard-pressure air afterward with a separate booster.

Oil Carryover: Why Downstream Filtration Still Matters

Oil-injected compression inherently carries a small amount of oil aerosol into the discharge air, which is why an oil-injected system is normally paired with downstream oil removal rather than run without it. The applicable gas purification equipment — oil removers, oil-water separators, and filters — determines the residual oil content actually delivered to the plant's air network, and is typically selected against the ISO 8573-1 oil class the connected equipment requires, rather than assumed from the compressor alone.

Frequently Asked Questions

What's the practical difference between the Single-Stage and Two-Stage models on this page?

The two-stage compressor splits compression across two rotor sets, which reduces the compression ratio per stage and improves efficiency — published at up to 25% lower energy use than an equivalent single-stage unit at the same output pressure. The single-stage model is mechanically simpler and is typically specified where duty is lighter or intermittent rather than near-continuous.

Should I choose a PM VSD or an FSD version of the same model?

PM VSD suits sites where air demand varies significantly through the day, since the motor can track that demand at high efficiency down to low speed. FSD suits sites with a fairly flat, continuous air demand, where the added cost and complexity of a variable-speed drive has less to work with.

What warranty applies to these compressors?

Zhejiang Baiao Gas Equipment Co., Ltd. offers a warranty of 1 to 5 years depending on the model and configuration selected.

Can Zhejiang Baiao Gas Equipment Co., Ltd. supply a custom configuration rather than one of the five listed models?

Yes — compression stage, drive type, and pressure range are configured to the enquiry. The five models shown represent the common combinations, not a fixed limit on what can be specified. See the Industrial Air Compressor category page for the full range, including oil-free, portable, and centrifugal alternatives if oil-injected screw is not the right fit.

Zhejiang Baiao Gas Equipment Co., Ltd. manufactures its oil-injected rotary screw compressors in-house from a standardized workshop in Fuyang District, Hangzhou, with dedicated R&D and after-sales personnel supporting the range shown on this page.

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