Energy savings in focus as Atlas Copco ZS 4 VSD blower targets low-pressure demand

Atlas Copco is expanding its low-pressure portfolio with the ZS 4 VSD oil-free screw blower series, promising higher efficiency and quieter operation for wastewater treatment and other process industries. The industrial blower targets operators looking to cut energy use and lifecycle costs.

Edited by ad hoc news Flagship & Bestseller Desk. Reviewed before publication on 06/15/2026 at 3:49 PM ET. Details in the imprint.

Atlas Copco is sharpening its offer for energy-conscious plant operators with the ZS 4 VSD oil-free screw blower series, a low-pressure flagship aimed at wastewater treatment plants and process industries looking to curb power bills without sacrificing reliability. The manufacturer positions the ZS 4 VSD range as a high-efficiency successor within its established ZS platform, combining variable speed drive control, oil-free compression and a compact footprint to replace older lobe blowers in applications from aeration tanks to pneumatic conveying. According to Atlas Copco, the new series covers an installed motor power band from roughly 37 kW to 90 kW, giving engineering teams enough headroom to size units for medium to large basin volumes and multi-line blower rooms. Industry EMEA reports that the ZS 4 VSD incorporates Atlas Copco's latest IE4 and IE5 motor technology to push overall efficiency higher than the previous generation.

What the ZS 4 VSD blower is built to do

At its core, the ZS 4 VSD is a packaged low-pressure blower designed for continuous-duty processes that operate in the 0.3 bar to roughly 1.2 bar(g) range where air must be delivered reliably but traditional compressors are over-specified and lobe machines waste energy. Atlas Copco builds the system around an oil-free screw element, which eliminates the risk of lubricant carryover into aeration tanks, food lines or chemical reactors and helps operators comply with increasingly strict discharge and product purity rules in sectors such as municipal wastewater and beverage production. The housing integrates an acoustic enclosure, inlet filtration, drive, controller and optional heat recovery interfaces into a plug-and-play skid that can be dropped into new builds or retrofitted in existing blower galleries with limited floor space.

A key technical differentiator is the way Atlas Copco marries the variable speed drive with a so-called smart pressure split concept and its own permanent magnet motor platform, allowing the blower to adjust speed continuously to actual process demand instead of cycling between fixed load points. This control strategy aims to keep the operating point close to the system's best efficiency island across seasonal load swings and diurnal aeration profiles, which can cut specific energy consumption significantly compared with older positive displacement blowers that run at constant speed and throttle excess flow. In addition, the integrated Elektronikon controller ties the package into plant networks for remote monitoring, trending and sequencing of multiple units, which is increasingly important for utility teams that need to prove energy savings and uptime to regulators and corporate sustainability departments.

Noise is another pressure point in many treatment works, where blower rooms sit close to operators, laboratories or even residential neighborhoods. By enclosing the screw element and motor in a sound-attenuated canopy and slowing the drive when full capacity is not needed, Atlas Copco is targeting lower sound pressure levels on the shop floor than with traditional bare-shaft lobe blowers, which can help plants meet occupational safety targets and reduce the need for additional acoustic treatment. The unit is offered with both air-cooled and water-cooled variants, so engineering firms can match the cooling concept with whichever utility profile and ambient conditions they face, from compact indoor galleries to warmer industrial sites that prefer water-cooling to stabilize internal temperatures.

From a lifecycle perspective, Atlas Copco emphasizes that the ZS 4 VSD is designed as a long-run asset rather than a short-term retrofit, with the oil-free screw element and drive platform aligned with extended service intervals and centralized digital monitoring. The package can be coupled with service agreements that bundle preventive maintenance, remote diagnostics and performance audits, giving operators a clearer view of total cost of ownership than with older, more mechanically simple blowers that often lack sensors and connectivity. Because energy consumption dominates lifecycle costs in low-pressure air systems, even modest efficiency gains measured in kilowatt-hours per kilogram of oxygen transferred or per ton of product conveyed can translate into payback periods that fit within typical infrastructure funding cycles at utilities and industrial plants. Atlas Copco says the series is targeted primarily at municipal wastewater, industrial effluent treatment, bulk material handling and general manufacturing customers that are upgrading or expanding aeration and conveying lines.

Strategically, the ZS 4 VSD range strengthens Atlas Copco's position at the higher-value end of the blower market, where customers are willing to invest in premium packages if they can document energy and maintenance savings over 10 to 15 years of operation. Low-pressure blowers are not the group's largest revenue line, but they sit at the intersection of process reliability and sustainability spending, two themes that are driving capital budgets in water utilities and process industries across Europe, the Americas and parts of Asia-Pacific. The company has been expanding this segment in tandem with its compressed air portfolio, marketing oil-free technologies as a way for customers to hit internal carbon-reduction targets as well as emerging regulatory benchmarks. The official Atlas Copco product page highlights wastewater treatment, pneumatic conveying and general manufacturing as the main application areas for the ZS 4 VSD family.

Shares of Atlas Copco A (SE0011166610) are listed on Nasdaq Stockholm, where the A share last traded at SEK 218.00 on 06/13/2026. Nasdaq Nordic data confirm the listing of Atlas Copco's A share on the Stockholm exchange.

Atlas Copco ZS 4 VSD blower in brief

• Product: ZS 4 VSD oil-free screw blower series
• Manufacturer: Atlas Copco AB
• Category: Flagship low-pressure blower
• Launch date: 2024 (international market introduction)
• MSRP / Price: Project-based pricing; depends on configuration and market
• Availability: Direct sales and authorized industrial distributors in Europe, the Americas and selected Asia-Pacific markets
• Target audience: Municipal and industrial wastewater operators, process industries, bulk material handling and general manufacturing plants
• Key differentiator / USP: Oil-free screw technology combined with variable speed drive and high-efficiency IE4/IE5 motor platform for lower specific energy consumption in low-pressure air applications

This article was a.i.-assisted and editorially reviewed. Product information without warranty; prices and availability may change at short notice. Not investment advice and not a buy or sell recommendation. Trading involves risk up to and including the total loss of invested capital.