• Multi-turn Electric Actuators
• Oct 09, 2026
• 10 Views

IP68 Electric Actuator: Features, Benefits and Applications

Industrial automation requires equipment that can operate reliably under challenging environmental conditions. In industries where machinery is exposed to rain, dust, moisture, flooding, and demanding operating environments, selecting the right actuator is essential for maintaining efficiency and safety. Electric actuators play an important role in controlling valves, dampers, and other mechanical systems by converting electrical energy into controlled mechanical movement. Their performance directly affects the accuracy, reliability, and efficiency of automated industrial processes.

An IP68 Electric Actuator is designed with a high level of protection against dust and water ingress when tested under specified conditions. The IP68 classification makes these actuators suitable for applications where equipment may experience prolonged water exposure or temporary submersion, depending on the manufacturer's stated operating limits. These actuators are commonly considered for water treatment plants, wastewater facilities, chemical processing units, and outdoor installations. Understanding their construction, operating principles, features, and applications helps industrial buyers choose suitable equipment for long-term operational reliability.

What Is an IP68 Electric Actuator?

An electric actuator is a mechanical device that uses an electric motor to produce movement. It is commonly used to open, close, or position industrial valves and dampers without requiring manual operation. Depending on its design, an actuator may provide quarter-turn movement, multi-turn rotation, or linear motion. These different configurations allow engineers to select equipment according to the requirements of the controlled mechanism.

The IP68 designation refers to the actuator's enclosure protection against solid particles and water ingress. The first digit, 6, indicates dust-tight protection, while the second digit, 8, indicates protection against water immersion under conditions specified by the manufacturer and applicable testing requirements. It is important to understand that IP68 does not establish one universal immersion depth or duration for every product. Buyers should verify the manufacturer's declared limits before selecting an actuator for submerged installations.

These actuators combine electrical operation with a protective enclosure to support dependable performance in environments where moisture and contamination are concerns. However, the complete installation must also account for cable entries, connectors, mounting arrangements, and other potential ingress points.

Understanding the IP68 Protection Rating

Ingress Protection ratings help users evaluate how effectively electrical equipment enclosures resist the entry of solid objects and water. The rating system provides a standardized framework for comparing protection levels, although the actual performance depends on the product design and testing conditions.

For an IP68-rated actuator, the first digit indicates complete protection against dust ingress under the relevant test conditions. This is particularly useful in cement plants, mining operations, manufacturing facilities, and other industrial environments where airborne particles may affect mechanical or electrical equipment. Dust protection helps reduce the risk of contamination inside the enclosure, which can otherwise contribute to premature component failure.

The second digit indicates suitability for immersion in water under conditions agreed upon or specified by the manufacturer, within the applicable standard's framework. The precise depth, duration, water conditions, and installation requirements must be confirmed for the specific actuator. An IP68 rating should not automatically be interpreted as protection against high-pressure water jets, corrosive liquids, or every possible flooding scenario. Understanding these distinctions allows engineers to make informed decisions and avoid selecting equipment based on the rating alone.

Key Features of IP68 Electric Actuators

Modern electric actuators incorporate several design features intended to improve operational reliability, control accuracy, and ease of integration. The exact features depend on the manufacturer, actuator model, torque capacity, and intended application. Evaluating these characteristics helps industrial users identify equipment that meets their operational requirements.

A major feature is the sealed enclosure, which protects internal electrical and mechanical components against dust and water ingress under the declared IP68 conditions. Suitable sealing materials, carefully designed housing joints, and protected cable entries contribute to maintaining enclosure integrity. Corrosion-resistant external materials and protective coatings may also be available for installations exposed to humidity or aggressive industrial atmospheres.

Other important features may include position indicators, limit switches, torque protection, manual override mechanisms, and electrical control interfaces. Some models support remote operation through industrial control systems, while advanced versions may provide position feedback and diagnostic information. These capabilities can help operators monitor valve movement and identify operating problems more efficiently.

When comparing products, users should consider the actuator's rated torque, operating time, duty cycle, supply voltage, control method, ambient temperature limits, and maintenance requirements. A suitable combination of these features helps ensure that the actuator performs reliably under actual working conditions.

How Does an IP68 Electric Actuator Work?

An electric actuator operates by converting electrical energy into mechanical movement. When a control signal is received, the motor generates rotational force that passes through a gearbox or another transmission mechanism. The resulting movement drives the connected valve stem, valve shaft, or damper mechanism. Depending on the equipment configuration, the actuator may perform quarter-turn, multi-turn, or linear movement.

In a typical automated installation, a controller sends an open, close, or positioning command to the actuator. The motor operates until the required position is reached or the control system stops the movement. Limit switches, torque switches, position sensors, or electronic control systems may be used to help prevent overtravel and support accurate operation. The precise control arrangement depends on the selected model.

The protective enclosure helps shield electrical components from environmental exposure within the rated limits. Nevertheless, reliable operation also depends on correct installation, suitable cable glands, proper electrical connections, and adherence to the manufacturer's operating instructions. For installations involving immersion, engineers must confirm that the actuator and all relevant electrical interfaces are suitable for the specified conditions.

Industrial Applications of IP68 Electric Actuators

IP68-rated actuators are useful in industrial applications where dust protection and resistance to water ingress are important selection criteria. Their suitability depends on the process conditions, mechanical requirements, electrical specifications, and protection limits stated by the manufacturer.

1. Water and Wastewater Treatment

Water treatment facilities use automated valves to regulate water flow, isolate pipelines, and manage treatment processes. Actuators may be installed in areas exposed to splashing, flooding, high humidity, or temporary immersion. A correctly selected enclosure protection rating helps reduce the risk of water ingress into the actuator's electrical components.

Wastewater treatment plants also contain demanding environments where moisture, suspended particles, and corrosive gases may be present. Selecting suitable sealing materials and corrosion-resistant construction is therefore important. Operators should evaluate the actuator's suitability for the actual environment rather than relying exclusively on its IP rating.

2. Chemical Processing Industries

Chemical manufacturing facilities require dependable valve automation for controlling liquids, managing process flows, and isolating equipment. Some installations operate in humid environments or locations where water exposure is possible during cleaning and maintenance activities.

An appropriately rated actuator can help protect internal components against dust and water ingress. However, the enclosure rating alone does not establish chemical compatibility, explosion protection, or suitability for hazardous areas. These requirements must be evaluated separately, especially where flammable substances or aggressive chemicals are present.

3. Marine and Coastal Installations

Marine facilities, ports, and coastal industrial plants frequently experience moisture, salt-laden air, and challenging weather conditions. Electric actuators used in these environments may require sealed enclosures, suitable external coatings, and corrosion-resistant fasteners.

IP68 protection can be valuable where water immersion is a defined possibility, provided the manufacturer's immersion limits cover the installation conditions. Saltwater exposure and corrosion resistance require additional consideration because an ingress protection rating does not automatically certify resistance to seawater corrosion.

4. Power Generation Facilities

Power plants use automated valves and dampers to regulate fluids, support cooling systems, and control auxiliary processes. Certain installations may expose equipment to moisture, washdown activities, or potential flooding.

Selecting an actuator with suitable enclosure protection can support dependable operation in these areas. Engineers must also assess temperature limits, torque requirements, operating frequency, electrical safety, and any site-specific certification requirements before installation.

5. Outdoor Industrial Automation

Outdoor installations expose equipment to rain, dust, changing temperatures, and other environmental factors. IP68-rated actuators may be appropriate for demanding outdoor applications where water ingress is a concern.

Proper installation remains essential. Cable connections, mounting orientation, drainage arrangements, and enclosure maintenance must follow the manufacturer's recommendations. If the installation could involve prolonged immersion, the declared immersion depth and duration should be checked against the expected flooding conditions.

Benefits of Using IP68 Electric Actuators

One of the primary benefits of these actuators is their strong protection against dust and water ingress under specified conditions. By reducing the likelihood of environmental contamination reaching sensitive internal components, a suitable enclosure can contribute to operational reliability and help limit avoidable equipment failures.

Another benefit is the potential to automate processes that would otherwise require manual valve operation. Remote operation can improve process control, reduce unnecessary operator movement, and support integration with programmable logic controllers and supervisory control systems. In applications where frequent operation is required, automated actuation can also help improve consistency.

These actuators may support lower maintenance demands when compared with equipment that is poorly suited to its operating environment. However, maintenance requirements still depend on the motor, gearbox, seals, electrical connections, and operating conditions. Periodic inspection is necessary to identify wear, damage, or changes that could affect protection.

Additional benefits may include precise positioning, reduced manual intervention, improved process repeatability, and greater flexibility in system design. The actual advantages depend on the actuator configuration and how effectively it is matched to the application.

Types of Electric Actuators Available

Electric actuators are available in different configurations to accommodate the movement and force requirements of industrial equipment. Selecting the correct type is essential for ensuring proper mechanical operation.

Not every configuration is automatically available with IP68 protection. Buyers should confirm the rating for the exact model and actuator assembly, including any required accessories.

Important Factors When Selecting an IP68 Electric Actuator

Choosing an actuator requires more than comparing enclosure ratings. The equipment must match the mechanical, electrical, and environmental demands of the application.

Torque requirements: Determine the torque needed to operate the connected valve or damper. Consider breakaway torque, differential pressure, friction, and an appropriate engineering safety margin.

Power supply: Verify the available voltage, frequency, phase configuration, and control circuit requirements. The selected actuator must be compatible with the facility's electrical system.

Operating speed: Consider how quickly the valve must open or close. Excessively fast operation may create process disturbances, while slow movement may not meet operational requirements.

Duty cycle: Establish how frequently the actuator will operate and how long it must run during each cycle. The motor and gearbox should be rated for the intended operating pattern.

Environmental conditions: Evaluate ambient temperature, humidity, dust, water immersion, corrosion, vibration, and exposure to cleaning chemicals.

Control and feedback: Determine whether simple open-close operation is sufficient or whether modulating control, remote monitoring, position feedback, or communication interfaces are required.

Certifications: Verify electrical safety, hazardous-area approvals, and other applicable certifications independently. IP68 protection does not replace these requirements.

IP68 Electric Actuator vs. Other Protection Ratings

Different ingress protection ratings are intended for different environmental requirements. Selecting a rating that matches the installation helps avoid unnecessary costs while maintaining appropriate protection.

The water protection tests and conditions differ across these ratings. IP68 should not be treated as a universal guarantee of superior performance under every type of water exposure. For example, resistance to immersion does not necessarily demonstrate resistance to powerful water jets or high-pressure cleaning. The operating environment should determine the appropriate protection level.

Installation and Maintenance Best Practices

Correct installation is essential for achieving the intended performance of an IP68-rated actuator. Before installation, inspect the housing, sealing surfaces, cable entries, and mounting components for visible damage. Confirm that the actuator's torque rating, output configuration, and mounting interface match the connected valve or damper.

Electrical connections should be completed by qualified personnel according to the manufacturer's instructions and applicable electrical regulations. Use compatible cable glands, connectors, and sealing components, ensuring that each maintains the protection level required for the installation. Unused cable openings must be sealed using suitable components. Improper cable entry installation can compromise the enclosure's protection even when the actuator itself has the correct rating.

Routine maintenance should include checking mounting bolts, external corrosion, cable condition, control operation, and visible seal damage. Functional tests can help verify that the actuator opens, closes, and responds to control commands as intended. Any inspection or testing involving immersion must follow the manufacturer's approved procedures.

Maintenance intervals should reflect operating conditions and manufacturer guidance. Equipment exposed to saltwater, chemicals, vibration, or repeated temperature changes may require additional inspections. Keeping maintenance records can help identify recurring issues and support better equipment management.

Common Challenges and How to Prevent Them

Although high ingress protection can improve equipment suitability for demanding environments, it does not eliminate every possible operating problem. Incorrect actuator sizing is one common issue. An actuator with insufficient torque may struggle to operate a valve, while an unsuitable control arrangement can result in poor positioning or unnecessary motor operation. Proper engineering calculations and product selection help prevent these problems.

Another challenge is assuming that a sealed enclosure is suitable for every environmental hazard. IP68 protection does not automatically establish resistance to corrosive chemicals, extreme temperatures, explosive atmospheres, or mechanical impact. These characteristics must be confirmed separately according to the installation requirements.

Poor cable management and incorrect installation practices can also compromise reliability. Damaged cable glands, incompatible connectors, and improper sealing may allow water to enter the enclosure. Following approved installation procedures and using compatible components helps reduce this risk.

Conclusion

An IP68 Electric Actuator can provide an effective solution for industrial valve and damper automation in environments where dust protection and water immersion resistance are important. Its sealed enclosure, electrical operation, and potential integration with automated control systems make it suitable for a variety of water treatment, marine, chemical processing, power generation, and outdoor industrial applications.

Successful selection depends on evaluating torque, operating speed, power supply, duty cycle, environmental exposure, and control requirements alongside the ingress protection rating. Buyers should always verify the manufacturer's specified immersion conditions and ensure that cable entries, connectors, and installation practices maintain the required protection.