EP-CMW7.4-0.8 Oil-Free Scroll Air Compressor
The EP-CMW7.4-0.8 combines two 3.7 kW scroll heads to produce 830 L/min of oil-free compressed air at 0.8 MPa — a high-capacity dual-air-end solution engineered for large-scale food processing, high-speed rail maintenance depots, and multi-line industrial facilities requiring uninterrupted clean air at volume.
EP-CMW7.4-0.8: High-Volume Dual-Head Oil-Free Scroll Compressor for Industrial-Scale Clean Air Supply
When a single-head scroll compressor reaches its output ceiling and multi-machine installations become operationally complex, the EP-CMW7.4-0.8 offers a cleaner solution: two optimised 3.7 kW scroll heads in a single managed cabinet, producing a combined 830 L/min of certified oil-free air at working pressures from 0.2 to 0.8 MPa. At 55 +/- 3 dB(A) and a footprint of 880 x 720 x 1120 mm weighing 185 kg, this unit delivers industrial air volumes with the acoustic signature and oil-free credentials of a much smaller machine. For operations supplying compressed air to large food processing facilities, rail maintenance facilities, or multi-line coating plants, the EP-CMW7.4-0.8 represents a technically advanced alternative to oil-based rotary screw systems. Compare it with other capacity options in the full EP-CMW product range.
The dual-head configuration provides the same demand-responsive load sharing and automatic lead/standby rotation as the EP-CMW4.4-0.8, but at nearly double the air delivery capacity. An intelligent PLC with touch panel display manages both heads, displaying the real-time status of each scroll mechanism and flagging maintenance requirements individually -- making it straightforward for facility teams to manage a high-capacity unit with the same simplicity as a smaller machine.
Why 830 L/min from Dual Heads Rather Than a Single Large Compressor
A single rotary screw compressor producing 830 L/min of oil-free air requires complex dry-screw or water-injected screw technology that demands frequent servicing of dry screw coatings or water management systems. A single scroll mechanism at this output would also require a significantly larger housing with more challenging heat dissipation. The EP-CMW7.4-0.8 avoids all of these complications by using two proven 3.7 kW scroll heads -- each individually simple, each carrying a 2-year warranty -- in a coordinated dual configuration. Ever Power's scroll design expertise, which extended to producing the world's first 1.2 MPa scroll compressor and contributing to national industry standards, underpins the precision of each scroll head in this unit.
Feature Overview
830 L/min Combined Output -- Largest 0.8 MPa Dual-Head Scroll
At 830 L/min, the EP-CMW7.4-0.8 produces more than double the air volume of the single 3.7 kW model while maintaining the same scroll compression quality: oil-free, pulse-free, low-noise air with no filtration compromise.
55 dB(A) -- Quieter Than Most Industrial Compressors at This Capacity
Industrial compressors in the 7-8 kW range typically operate at 65-72 dB(A). The EP-CMW7.4-0.8 achieves 55 +/- 3 dB(A) through the combination of scroll technology's inherently smooth compression cycle, direct-drive elimination of belt noise, and advanced soundproof casing -- enabling installation in operator-occupied spaces without acoustic enclosures.
Demand-Responsive Dual-Head PLC Management
The intelligent PLC controller starts and stops individual heads based on real-time system pressure, operating only the capacity needed at any given moment. During off-peak periods, a single head handles the load; at peak demand, both heads operate simultaneously. Energy is not consumed maintaining a large compressor at idle when partial capacity suffices.
Automatic Head Rotation and Maintenance Scheduling
Running hour equalisation across both heads is handled automatically by the PLC. The controller also tracks individual head service intervals and displays maintenance reminders for each head independently -- preventing a situation where one head accumulates significantly more wear than the other.
1 Inch Stainless Steel Outlet for High-Flow Installations
The EP-CMW7.4-0.8 uses a 1-inch stainless steel outlet connection -- the largest outlet in the 0.8 MPa scroll range -- matched to the unit's higher flow rate. This reduces outlet velocity and connection pressure loss, maintaining consistent downstream pressure even at full 830 L/min output.
Dual Independent Permanent Magnet Motors
Each of the two 3.7 kW scroll heads uses its own direct-drive permanent magnet motor with IP65 protection, F-class insulation, and over 94% efficiency. Independent motor operation means a fault on one motor triggers the fault alarm and keeps the second head -- and the air supply -- running uninterrupted.
Scroll Compression at Scale: How the EP-CMW7.4-0.8 Manages 830 L/min
Each scroll head in the EP-CMW7.4-0.8 compresses air through the same four-phase continuous cycle used across the entire CMW range: intake, sealing, progressive compression, and central discharge. The orbiting scroll traces a tight orbital path against the fixed scroll, generating multiple simultaneous compression pockets that progressively shrink toward the discharge port. Air flows out smoothly, without pulsation, at full working pressure. Both heads feed into a common stainless steel manifold with a 1-inch outlet, producing a combined steady flow of up to 830 L/min. The PLC manages which heads are active based on pressure feedback, ensuring the combined output precisely tracks actual air demand rather than running at maximum capacity regardless of need.
Technical Specifications -- EP-CMW7.4-0.8
| Parameter | Specification |
|---|---|
| Model | EP-CMW7.4-0.8 |
| Configuration | Dual Air-End (2 x 3.7 kW scroll heads) |
| Total Motor Power | 7.4 kW / 10 HP |
| Working Pressure Range | 0.2 - 0.8 MPa |
| Free Air Delivery (FAD) | 830 L/min |
| Noise Level | 55 +/- 3 dB(A) |
| Outlet Connection Size | 1 inch (stainless steel) |
| Weight | 185 kg |
| Dimensions L x W x H | 880 x 720 x 1120 mm |
| Air-End Warranty | 2 Years per head |
| Motor Type | Permanent Magnet x2, IP65, F-class, >94% efficiency each |
| Drive Type | Direct Drive per head (no belt, no coupling) |
| Control System | Intelligent PLC with touch panel, demand load sharing, head rotation |
| Tank and Pipework | Stainless Steel |
| Inlet Filtration | 1 micron per head |
| Lubrication | Oil-Free (annual bearing grease only per head) |
Target Applications for the EP-CMW7.4-0.8
| Sector | Application | Key Requirement Met |
|---|---|---|
| Large-Scale Food Processing | High-speed packaging lines, multi-station filling, conveyor actuation | BRC/GFSI-compliant clean air at volume without oil risk |
| Rail Maintenance Depots | Brake system testing, pneumatic tool supply, door mechanism maintenance | Reliable high-volume oil-free air for safety-critical rail systems |
| Industrial Coating Plants | Multi-gun spray booths, robotic painting cells, UV curing lines | Sustained 830 L/min prevents pressure droop during peak concurrent gun use |
| Electric Bus Manufacturing | Assembly jig pneumatics, body panel handling, tyre inflation bays | High flow supports multiple simultaneous assembly operations |
| Large Medical Apparatus Facilities | Central instrument air for hospital wings and imaging departments | Dual redundancy with high volume for critical care environments |
Customer Case Studies -- EP-CMW7.4-0.8
United Kingdom -- Large-Scale Food Manufacturer
Replacing Oil-Injected Screw System Across a Multi-Line Factory
A UK snack food manufacturer operating eight packaging lines across two halls needed to replace an aging oil-injected rotary screw system that had generated two food safety non-conformances in three years -- both related to oil aerosol detected in compressed air samples. The EP-CMW7.4-0.8 was selected for its 830 L/min capacity, which covered 80% of the factory's normal demand with a single unit. The load-sharing control reduced the compressor's running time by approximately 35% compared to the always-on screw system, cutting electricity consumption measurably. The food safety team confirmed zero oil-related audit findings in the 24 months following installation.
★★★★★
"Two non-conformances in three years from the old system -- zero in two years with this unit. The BRC auditor didn't even query the compressed air section." -- Quality Manager
South Korea -- Rail Maintenance Facility
High-Volume Oil-Free Air for KTX Brake System Testing
A Korean rail maintenance depot servicing KTX high-speed train sets required a high-volume oil-free compressed air source for pneumatic brake system test rigs. Their existing system used oil-injected compressors with extensive downstream filtration, but periodic oil bypass events in the filter elements created test validity concerns. The EP-CMW7.4-0.8's structurally oil-free 830 L/min output eliminated contamination at the source, removing the filtration maintenance burden and the associated bypass risk. The maintenance team also noted that the 55 dB(A) noise level made communication between technicians in the test bay significantly easier than with their previous system.
★★★★★
"No more filter bypass concerns. The test rig gets genuinely clean air every time, and we can actually talk in the bay while it's running." -- Technical Supervisor
Netherlands -- Robotic Paint Line Operator
Sustained High-Flow Air for a Six-Robot Automotive Coating Cell
A Dutch automotive component manufacturer running a six-robot painting cell needed sustained compressed air at volumes that caused pressure droop with their previous 5.5 kW single-head unit during peak concurrent robot activity. The EP-CMW7.4-0.8's 830 L/min output provided the required headroom, and the dual-head load sharing meant that during inter-cycle gaps when robots were repositioning, only one head ran. The quality engineer reported that consistent atomisation pressure -- a direct result of stable compressed air supply -- improved first-pass coating quality on their highest-value parts, reducing rework from 4.2% to under 1%.
★★★★★
"Pressure droop is gone, atomisation is consistent, and rework dropped from over 4% to under 1%. The energy saving from load sharing is a bonus." -- Quality Engineer
Frequently Asked Questions -- EP-CMW7.4-0.8
How does 830 L/min from dual scroll heads compare to a rotary screw compressor at this output level?
A rotary screw compressor producing 830 L/min of genuinely oil-free air requires dry-screw or water-injected screw technology -- both involving complex maintenance of dry screw coatings or water management systems, and both significantly noisier than scroll technology. The EP-CMW7.4-0.8 achieves the same volume through two precision scroll mechanisms, each individually simple to service, each carrying a 2-year warranty, and the combined unit operates at 55 dB(A) -- far quieter than any rotary screw compressor at this capacity.
What outlet pipe size does this unit use and is it compatible with standard compressed air pipework?
The EP-CMW7.4-0.8 uses a 1-inch stainless steel outlet -- the largest in the 0.8 MPa scroll range, matched to the higher flow rate. This connects to standard 1-inch BSP or NPT compressed air distribution systems. For facilities with existing smaller-diameter headers, a reducing fitting can be fitted without affecting compressor output.
Does a dual-head cabinet require more complex installation than a single-head unit?
No. The EP-CMW7.4-0.8 arrives as a single, self-contained cabinet with one electrical connection point, one compressed air outlet, and a single PLC controller managing both heads internally. From the installation team's perspective, it is handled exactly like a single-head compressor of equivalent physical dimensions -- the internal dual-head coordination is entirely managed by the PLC.
How does the unit behave during variable shift patterns with widely varying air demand?
The load-sharing PLC continuously monitors system pressure and adjusts which heads are running in real time. During low-demand periods such as night shifts or weekend maintenance windows, only one head runs. When full-shift multi-line production begins, both heads are brought online automatically in response to falling system pressure -- no operator input required. This means energy is consumed only in proportion to actual production demand.
What information does the touch panel display for a dual-head installation?
The PLC touch panel shows the individual operating status of each scroll head (running/standby/fault), discharge temperature and pressure readings per head, cumulative running hours per head, overall system pressure, maintenance reminder intervals for each head independently, and active fault codes with descriptive alarm text. For facilities with three or more scroll heads in one cabinet, the touch panel interface is the standard control method across the EP-CMW range.
Submit Your Enquiry -- EP-CMW7.4-0.8
The EP-CMW7.4-0.8 is available for technical consultation and quotation. Ever Power's application engineering team can assist with sizing confirmation, integration planning, and configuration guidance for both standard and custom high-volume oil-free installations. Review the complete EP-CMW product range for all available power and pressure combinations, or learn more about Ever Power's engineering capabilities and manufacturing standards.
Factory tour
Related Products
-
CM/PV permanent magnet variable frequency oil-free screw air compressor
-
CM/PV permanent magnet variable frequency oil-free screw air compressor
-
CM/GPV medium pressure permanent magnet variable frequency oil-free screw air compressor
-
CM/G medium pressure industrial frequency oil-free screw air compressor