Replacing an actuator in an industrial application does not always mean finding another component based on the same technology.
Sometimes the correct engineering solution is to change the actuation technology altogether, provided that the replacement satisfies the actual requirements of the application: stroke, force, operating environment, installation conditions and available power source.
A historical Vega technical case provides a clear example. A Customer was looking for a replacement for an electric cylinder, identified as CX050C2A400, with an approximately 400 mm stroke. The application was intended for a clean environment.
After evaluating the application, the Vega Team proposed a different technology: a special CC080 pneumatic cylinder with a 400 mm stroke. At 8 bar, the proposed solution could provide approximately 400 kgf of pushing force and 320 kgf of pulling force.
This case demonstrates why actuator replacement should begin with the application rather than with the technology of the original component.
The Customer’s Initial Requirement
The original request was for a replacement of the CX050C2A400.
The Customer specified an approximately 400 mm stroke and explained that the actuator would be used in a clean environment.
The existing CX050C2A400 was not part of Vega’s current range at the time of the technical evaluation. The Sales Department therefore asked the Technical Department to investigate whether an alternative solution could be proposed.
Rather than limiting the search to another electric actuator, the Vega Team evaluated the operating environment and the actual requirements of the application.
The Replacement Does Not Have to Use the Same Technology
This is the central lesson of the case.
The original actuator was electric, but the proposed replacement was pneumatic.
The Vega Technical Department concluded that, considering the environment in which the cylinder would operate, the solution it could propose was a special pneumatic CC080 with a 400 mm stroke.
This does not mean that pneumatic cylinders are universally preferable to electric actuators in clean environments.
It means that the operating environment can be an important factor when selecting the most appropriate actuation technology.
The engineering process should therefore be:
Required function → operating conditions → required force and stroke → available energy source → suitable actuator technology → final configuration
rather than:
Existing actuator → identical technology → closest catalogue replacement
Maintaining the Required 400 mm Stroke
Stroke was one of the clearest requirements in the Customer’s request.
The application required approximately 400 mm, and the proposed CC080 was specified with a 400 mm stroke.
Maintaining the required stroke is important because changing the actuator technology should not automatically require changing the machine’s mechanical movement.
However, matching the stroke alone does not make two actuators interchangeable.
Before replacing an actuator, the following parameters should also be checked:
- mounting dimensions;
- rod-end connection;
- available installation space;
- required force;
- force direction;
- operating speed;
- operating cycle;
- available pressure;
- pneumatic connections;
- end-of-stroke requirements;
- mechanical interfaces.
The 400 mm stroke is therefore an essential requirement, but it represents only one part of the complete engineering evaluation.
Evaluating the Required Force
One of the most useful pieces of technical information in this case is the force specified for the proposed pneumatic solution.
At 8 bar, the Vega Team indicated approximately:
- 400 kgf in pushing;
- 320 kgf in pulling.
These two values are different because the effective pneumatic area is different when the cylinder is extending and retracting.
This distinction is particularly important when replacing an existing actuator.
The engineer should therefore establish whether the application requires:
pushing force,
pulling force,
or both during different phases of the cycle.
Selecting the actuator according to the larger nominal force without considering the actual direction of movement can result in an inappropriate solution.
Why Operating Pressure Matters
The proposed force values were specified at 8 bar.
This means that the pneumatic system must be capable of supplying the required pressure under the actual operating conditions.
The analysis should not consider pressure only as a nominal value.
It is also useful to verify:
- pressure stability;
- pressure losses;
- valve sizing;
- pipe dimensions;
- available flow rate;
- cycle frequency;
- required movement speed.
A cylinder that provides the required force at 8 bar may behave differently if the actual pressure at the cylinder drops significantly during operation.
Clean Environment as a Design Requirement
The Customer specifically indicated that the application was intended for a clean environment.
This requirement influenced the technical evaluation.
The Vega Team’s internal technical response explicitly connected the operating environment with the proposed pneumatic solution.
This illustrates a broader engineering principle:
The environment in which an actuator operates can be just as important as its force and stroke.
Depending on the application, the designer may need to consider:
- contamination;
- oil or lubricant leakage;
- cleanliness requirements;
- temperature;
- humidity;
- surrounding process materials;
- maintenance requirements.
The correct technology should therefore be selected only after the complete operating environment has been understood.
A Different Technology Can Still Provide the Same Function
The objective of the replacement was not to reproduce the original electric cylinder internally.
The objective was to provide the required mechanical movement.
In simplified terms, the application required:
approximately 400 mm linear movement + sufficient force + suitability for the operating environment
The Vega proposal addressed these functional requirements using a pneumatic actuator rather than an electric one.
This distinction between component equivalence and functional equivalence is extremely important.
Component equivalence
A replacement has similar:
- dimensions;
- technology;
- interfaces;
- specifications.
Functional equivalence
A replacement performs the required function while satisfying the actual operating conditions.
In engineering applications, functional equivalence can sometimes provide more useful solutions than attempting to reproduce the original component exactly.
Why the Complete Configuration Still Had to Be Defined
The Vega Team did not consider the technical evaluation complete simply because a CC080 with a 400 mm stroke had been identified.
The technical response stated that, if the proposed solution was acceptable, the complete code should be provided before proceeding with the quotation.
This is an important step.
A cylinder model alone does not necessarily define every feature required for a specific application.
The final configuration may depend on:
- bore;
- stroke;
- rod configuration;
- mounting;
- connections;
- seals;
- special execution;
- accessories;
- application-specific requirements.
This is particularly relevant when the cylinder is described as a special version.
Why Special Cylinders Can Be Necessary
Industrial applications often impose requirements that cannot be satisfied by selecting the closest standard catalogue product.
A cylinder may need to be adapted because of:
- unusual installation dimensions;
- special environmental conditions;
- a particular rod length;
- non-standard mounting;
- unusual stroke;
- special materials;
- specific sensing requirements.
Vega’s current product philosophy also places considerable emphasis on application-specific hydraulic-cylinder solutions for injection molding and die-casting. Its current range includes different cylinder families categorized according to application.
Hydraulic Cylinders for Molds – Vega Cylinders — Official Vega product overview organized by mold application.
Hydraulic Cylinder Catalog – Vega Cylinders — Official Vega catalog page with cylinder families organized by application.
The Importance of Understanding the Existing Application
When replacing an actuator, the original component provides useful information, but it should not be the only source of information.
The engineer should identify what the original cylinder actually does.
For example:
What is it moving?
How much force is required?
How far must it move?
How quickly must it move?
In which direction is the main load applied?
What environment surrounds the actuator?
What energy source is available?
What mechanical interfaces must remain unchanged?
Once these questions have been answered, it becomes possible to evaluate whether the original technology should be retained or replaced.
A Practical Replacement Workflow
A useful approach to actuator replacement can be summarized in seven steps.
1. Identify the existing actuator
Record the original model, dimensions and configuration.
In this case, the starting point was the CX050C2A400.
2. Identify the required movement
Determine the actual stroke and movement profile.
The Customer required approximately 400 mm, and the proposed solution also had a 400 mm stroke.
3. Calculate the required force
Determine whether the application requires pushing, pulling or both.
For the proposed CC080, Vega indicated approximately 400 kgf pushing and 320 kgf pulling at 8 bar.
4. Analyse the environment
Determine whether the actuator must operate in a clean, dusty, wet, high-temperature or otherwise demanding environment.
In this case, the clean environment was a key consideration.
5. Evaluate alternative technologies
Do not automatically assume that the replacement must use the same actuation technology.
Electric, hydraulic and pneumatic technologies may have different advantages depending on the application.
6. Verify mechanical compatibility
Check the mounting, rod end, available space and connections.
7. Define the complete product code
Only after the application has been evaluated should the final configuration and quotation be prepared. This was also the approach taken by the Vega Team in this case.
A Lesson for Machine and Mold Designers
The case provides a useful lesson for designers who need to replace discontinued or unavailable actuators.
A discontinued product does not necessarily mean that the application itself has to be redesigned completely.
The first question should be:
What function did the original actuator perform?
Once that function has been defined, alternative technologies can be evaluated.
In this case, the original electric cylinder was no longer available in the Vega range, while the technical evaluation identified a pneumatic solution capable of providing the requested 400 mm stroke and the specified force at 8 bar.
Conclusion
Replacing an industrial actuator is not always a matter of finding another product with the same technology.
In this Customer case, the original requirement concerned an electric CX050C2A400 with approximately 400 mm of stroke, intended for a clean environment.
The Vega Team evaluated the application and proposed a different approach: a special pneumatic CC080 with a 400 mm stroke. At 8 bar, the proposed solution was specified to provide approximately 400 kgf of pushing force and 320 kgf of pulling force.
The case demonstrates a fundamental engineering principle:
The best replacement is not necessarily the component that most closely resembles the original. It is the actuator that can reliably perform the required function under the actual operating conditions.
Stroke, force, environment, available energy, mechanical integration and the complete product configuration must all be considered before the final replacement is selected.
Useful and Verified URLs
I checked the links against the current official Vega domains. Because this Customer Case concerns a historical CC080 pneumatic special version, I would not link to a current CC080 product page unless Vega currently publishes one. The following are verified official Vega pages and are relevant to the engineering principles discussed in the article.
- Hydraulic Cylinders for Molds — Official Vega product overview organized by application, including cylinders for cart and plug movement, ejection plates and mechanical locking.
- Hydraulic Cylinder Catalog — Official Vega catalog page presenting the current cylinder families and their application categories.
- Vega Cylinders – Official Website — Official Vega website with the current product range and company information.
- Vega Cylinders – Company and Technical Support — Official company page describing Vega’s hydraulic-cylinder development, production and technical support activities.
- Vega Sales Network — Official Vega sales-network page, including Mexico among the supported markets.
