Low Pressure Screw Air Compressor

Compressing to 0.8 MPa and then throttling down to 0.5 MPa wastes electricity on every cubic meter of air. This low pressure screw air compressor is engineered specifically for 0.3-0.6 MPa duty to avoid exactly that waste. Where most plants run a standard machine at 0.8 MPa and then throttle it down for processes that only need 0.5 MPa - which burns electricity for pressure that is simply vented off - this machine compresses directly to the required low pressure. The rotor profile and airend are redesigned for the low pressure ratio: volumetric efficiency rises by more than 10% compared with a standard machine running in low-pressure mode, and because the pressure ratio is low, the bearings carry lighter loads and last longer. Across the series, air delivery ranges from 13.5 to 60 m3/min at 5 bar, which covers everything from a small textile workshop to a large aeration blower station. The motor power is matched precisely to the low-pressure flow requirement, avoiding the oversized-motor inefficiency that buyers call a big horse pulling a small cart. System pressure loss is kept low and the flow path is sized for large-volume delivery, so the unit supplies the big air volumes needed for aeration, conveying and textile processes. Because the rotor profile is matched to the low pressure ratio, the airend moves more air per kilowatt at 0.3-0.6 MPa than a standard-profile machine would on the same duty, and the lightly loaded bearings extend service intervals in continuous-running plants. It runs smoothly and quietly, and service follows familiar screw-compressor procedures, with power points from 55 kW to 250 kW and delivery up to 60 m3/min on standard models. For plants that buy standard machines and run them throttled at half pressure, swapping to this dedicated low-pressure airend is one of the quickest energy upgrades available, because no pipework changes are needed beyond matching the discharge pressure to the process.

Common low-pressure configurations are kept with ready spare consumables - air filters, oil filters, oil separators and lubricant are stocked on the shelf. For continuous-process plants such as textile and wastewater operations, where even a short stoppage costs production hours, stocked spares mean fast replacement and minimum downtime instead of waiting weeks for parts to be sourced.

Textile dyeing and weaving. Looms and air-jet weaving machines consume huge volumes of low-pressure air around the clock; the low-pressure optimized airend supplies this volume efficiently, and light bearing load extends life under continuous running.

Cement industry. Cement plants use low-pressure air for pneumatic conveying of raw meal and dust collection; dust-heavy environments favor the robust iron construction, while large flow meets the high conveying demand.

Wastewater aeration. Aeration tanks need steady large-volume air at low pressure; the dedicated low-pressure design avoids the throttling losses of standard machines, and quiet smooth operation fits outdoor blower stations.

Powder pneumatic conveying. Flour, plastic pellets and chemical powders are conveyed with large low-pressure air volumes; direct compression to 0.3-0.6 MPa removes the energy penalty of over-compressing and regulating down.

Glass and metallurgy. Glass feeder air and metallurgy process air run in high-temperature, continuous-operation plants; matched motor power and low system pressure loss keep energy cost controlled under long shifts.

Customization

 

We select the right power and flow point from the 55-250 kW range for the process, fine-tune the working pressure within 0.3-0.6 MPa, configure voltage and frequency for the local grid, and offer optional integration with an air receiver or dryer, plus outlet connection size and cabinet color. OEM and ODM branding is available for local distributors.

Units are export-packed on wooden pallets with plastic foam cushioning. We support EXW, FOB, CIF and DDP trade terms, and accept USD, EUR, CNY and offshore CNY payment. Delivery is 40 days for standard configurations and 60 days for customized ones, with 30% advance and 70% balance before shipment.

FAQ

 

Q: How do you handle spare parts when a machine needs service?

A: For common low-pressure models we stock air filters, oil filters, oil separators and lubricant, so consumables ship quickly and plant downtime is minimized.

Q: Do you offer discounts for multi-unit projects?

A: Yes. Volume discounts are offered based on order quantity, which suits wastewater, textile and cement projects that install several blowers or compressors in one phase.

Q: What is the MOQ?

A: One unit. A single low-pressure machine can be ordered for a pilot line, and repeat orders benefit from faster delivery.

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