Selecting the correct vacuum pump for an industrial or laboratory application is a decision that impacts long-term operational costs, maintenance schedules, and system reliability. Since 1983, Girovac has specialised in medium and high vacuum equipment, providing expert advice to facility managers and maintenance engineers across the UK.
A frequent question we encounter is how modern, engineered solutions like the MIL’S EVISA range compare to “traditional” rotary vane pumps. Girovac has over 40 years of vacuum expertise (since 1983), and we have been the UK distributor for MIL’S since 1996, so we have had nearly 30 years to see first-hand how French engineering can turn a standard technology into a very capable industrial asset. This article provides a technical comparison to help you decide which path is right for your specific requirements.
Understanding the Industry Baseline: Traditional Rotary Vane Pumps
For decades, the oil-lubricated rotary vane pump has been the workhorse of the vacuum industry. Its design is relatively simple: a rotor is positioned eccentrically in a cylindrical housing, with vanes that slide in and out of slots, creating chambers of varying volumes. This positive displacement mechanism is highly effective for achieving deep vacuum levels (often down to 10⁻³ mbar in two-stage models).
Traditional pumps, such as those from legacy European brands like Edwards or Leybold, are robust and dependable. They are the “standard” for a reason, they work. However, standard designs often require external accessories to handle specific industrial challenges, such as oil mist elimination or high-temperature operation. While these pumps are excellent for general-purpose use, they can sometimes fall short in demanding continuous-duty cycles or environments where noise and vibration are critical factors.
The MIL’S EVISA: Re-Engineering a Classic
The MIL’S EVISA series represents an evolution of the rotary vane principle. Manufactured in France, these pumps are not just a different brand; they are a re-engineered approach to lubricated vacuum technology. While they utilise the same core physics as traditional pumps, the EVISA range integrates features that are often considered “optional extras” elsewhere into the standard build.
1. Superior Efficiency and Continuous Operation
One of the primary technical advantages of the EVISA range is its ability to operate continuously from atmospheric pressure down to its ultimate vacuum in the 10⁻¹ to 10⁻² mbar range (down to 0.06 mbar on some current models). Many traditional rotary vane pumps struggle with continuous operation at higher pressures, which can lead to overheating or excessive oil carryover.
The EVISA is designed with a more robust thermal management system. This ensures that the pump maintains its performance even in high-ambient-temperature environments or during prolonged pumping cycles. For facility managers, this translates to fewer unplanned shutdowns and a more reliable vacuum supply for critical processes like freeze drying or degassing.
2. Integrated Oil Mist Filtration
In some traditional setups, particularly with older legacy pumps or budget generic models, the exhaust from a rotary vane pump may require an external oil mist filter to prevent oil vapours from entering the workspace. If these filters are not correctly sized or maintained, they can create backpressure, reducing the pump’s efficiency.
The MIL’S EVISA features an integrated, high-efficiency oil mist filter within the pump housing. This design ensures that the captured oil is returned directly to the lubrication circuit. This not only results in a cleaner working environment (essential for laboratory and healthcare settings) but also reduces oil consumption over time.
3. Noise and Vibration Mitigation
Noise pollution is a significant concern in modern manufacturing and research facilities. Traditional pumps can be notoriously loud, requiring expensive acoustic enclosures.
The EVISA range is specifically engineered for “silent” operation. Through precise balancing of the rotor assembly and high-quality French manufacturing tolerances, these pumps exhibit significantly lower vibration levels than many generic or older-generation rotary vane models. This makes them ideal for installation in locations where staff are working in close proximity to the equipment.
Technical Comparison at a Glance
To provide a clear overview, the table below highlights the key differences between a standard industry-baseline pump and the MIL’S EVISA:
| Feature | Traditional Rotary Vane | MIL’S EVISA |
|---|---|---|
| Manufacturing | Various (often global sourcing) | French Engineered & Manufactured |
| Filtration | Often external/optional | Integrated high-efficiency |
| Operation | Intermittent high-pressure | Continuous atmospheric to ultimate |
| Noise Level | Standard (often requires enclosure) | Low-noise design as standard |
| Maintenance | Frequent oil checks/external filter changes | Simplified onsite servicing |
| Reliability | Good (standard) | Extremely high (heavy-duty design) |
Maintenance and the “Total Solution” Approach
At Girovac, we emphasize the importance of maintenance in the total cost of ownership. A “cheap” pump can quickly become expensive if spares are difficult to source or if the design requires specialized tools for simple tasks.
The MIL’S EVISA is designed with the maintenance engineer in mind. The layout of the pump allows for “light onsite maintenance,” meaning common service tasks can be performed quickly without removing the pump from the system. This is a crucial advantage for facility managers looking to minimise downtime.
Furthermore, as the UK distributor for MIL’S since 1996, Girovac maintains a comprehensive stock of genuine MIL’S spares and consumables at our North Walsham workshop. We also provide cost-saving generic alternatives for standard components where appropriate, ensuring our customers always have a choice that fits their budget. Our 40+ years of vacuum expertise mean that if you encounter a technical issue, you aren’t calling a generic helpdesk; you are speaking to engineers who have been servicing these systems for decades.
Choosing the Right Equipment for Your Facility
While the MIL’S EVISA offers numerous advantages, the “better” pump always depends on the specific application.
- Choose a Traditional Rotary Vane if: Your application is intermittent, your budget is highly constrained for initial purchase, and you have the space for external filtration and acoustic management.
- Choose a MIL’S EVISA if: You require 24/7 reliability, you operate in a noise-sensitive environment, or you want a compact, integrated solution with lower long-term maintenance requirements.
Girovac provides a “total solution” approach. We don’t just sell you a pump; we help design the system, select the correct valves and measuring instruments, and provide ongoing support. Whether you need a small MIL’S pump for a laboratory freeze dryer or a large-scale industrial vacuum system, our team can provide the technical guidance necessary to make an informed decision.
Conclusion: Expertise You Can Trust
The transition from a standard vacuum pump to a high-performance MIL’S EVISA unit is often a turning point for many of our customers. The combination of French engineering and Girovac’s local UK support provides a level of security that is hard to match.
With over four decades of experience in the vacuum industry since 1983, we have seen technologies come and go. Our commitment to brands like MIL’S is based on their proven performance in the field, and our partnership as UK distributor since 1996 gives us a long, practical view of how these pumps perform outside the brochure. If you are looking to upgrade your current vacuum equipment or are designing a new system from scratch, we invite you to draw on our experience.
For expert advice on MIL’S EVISA pumps, or to discuss our range of reconditioned vacuum pumps (which include 6-month warranties for added peace of mind), please get in touch.
Contact Girovac Today:
- Email: [email protected]
- Visit: www.girovac.com
No task is too small or too large: from a single O-ring to a bespoke industrial system, we are here to support your vacuum requirements.