Innovative Solutions
ICO3S Solenoid Valve – for Hazardous Area Applications
IMI Maxseal ICO3S Solenoid Valve for ESD and Hazardous-Area Applications
The IMI Maxseal ICO3S is a stainless-steel solenoid poppet valve designed for pneumatic actuator control, Emergency Shutdown (ESD) valves, and hazardous-area automation systems. Available in NAMUR-mounted, inline, and manifold configurations, it provides fast switching performance, reliable venting behaviour, and predictable fail-safe actuator operation under demanding industrial conditions.
Manufactured with a 316L stainless-steel body and certified for ATEX, IECEx, and SIL-capable applications, the ICO3S is widely specified in oil & gas, LNG, petrochemical, offshore, power generation, and process industries where switching reliability and environmental resistance are critical to operational safety.
Commonly applied in pneumatic actuator systems, ESD valves, Safety Instrumented Systems (SIS), hazardous-area installations, and high-integrity shutdown architectures.
When the IMI Maxseal ICO3S Is the Preferred Solution
Conventional solenoid valves may perform adequately in standard automation systems, but shutdown and hazardous-area applications impose significantly higher demands on actuator control, venting performance, environmental resistance, and functional safety. The IMI Maxseal ICO3S is typically specified where predictable pneumatic operation must be maintained under demanding industrial and safety-critical conditions.
Emergency Shutdown Response Must Remain Predictable
ESD valves rely on rapid venting and dependable actuator movement during emergency demand conditions. Delayed pressure release or inconsistent valve operation can prevent a spring-return actuator from reaching its required fail-safe position within the specified response time.
Hazardous-Area Compliance Is Required
Offshore platforms, LNG terminals, petrochemical facilities, and chemical processing plants often require certified equipment for explosive atmospheres. ATEX and IECEx certified configurations support safe operation in hazardous locations exposed to vibration, moisture, and corrosive environments.
Direct NAMUR Actuator Integration Is Preferred
NAMUR-mounted installation reduces external tubing, minimises potential leak paths, and simplifies integration with both spring-return and double-acting pneumatic actuators. This improves consistency while reducing installation complexity.
Corrosion Resistance Influences Long-Term Reliability
In offshore and chemically aggressive environments, corrosion often develops in valve bodies, exhaust paths, and external components. The ICO3S uses 316L stainless-steel construction to improve resistance against moisture, salt exposure, and corrosive process conditions.
Functional Safety Performance Must Be Maintained
Safety Instrumented Systems (SIS) require repeatable actuator behaviour during proof testing and actual shutdown events. In these applications, predictable pneumatic performance is often as important as certification status itself.
Existing Shutdown Systems Exhibit Reliability Issues
Repeated shutdown delays, inconsistent venting behaviour, intermittent actuation, or unexplained response variation often indicate limitations in pneumatic control architecture rather than actuator failure. In these situations, upgrading the solenoid valve can improve overall shutdown reliability.
In many hazardous-area shutdown systems, reliability is determined by venting performance, pneumatic stability, environmental resistance, and actuator integration rather than actuator size alone. Selecting a certified high-integrity solenoid poppet valve often has a greater impact on shutdown performance than increasing supply pressure or changing actuator dimensions.
Engineering Factors That Influence ICO3S Performance
The performance of the IMI Maxseal ICO3S depends on more than the solenoid valve itself. Actuator volume, pneumatic supply conditions, venting requirements, electrical characteristics, and installation architecture all influence response time and long-term reliability. Proper integration is essential to achieve predictable actuator movement in ESD valves, Safety Instrumented Systems (SIS), and hazardous-area automation applications.
Venting Performance and Fail-Safe Response
Shutdown performance depends on how rapidly pressure can be exhausted from a spring-return actuator during a trip event. Restricted exhaust paths, incorrect valve selection, or unsuitable manifold design can delay fail-safe valve movement and increase shutdown time.
Supply Pressure and Pneumatic Stability
Consistent pneumatic supply pressure is essential for repeatable actuator performance. Pressure fluctuations can alter response time, affect valve operation, and reduce shutdown consistency in critical ESD and process automation systems.
Flow Capacity (Cv) and Actuator Volume
The valve flow coefficient (Cv) should be matched to actuator air volume and required response time. Insufficient flow capacity restricts actuator movement, while excessive flow can create instability in fast-acting pneumatic systems.
NAMUR Mounting and System Integration
Direct NAMUR mounting eliminates unnecessary tubing and reduces potential leak points between the solenoid valve and actuator. Correct pneumatic routing improves response consistency for both spring-return and double-acting actuator configurations.
Coil Selection and Electrical Reliability
Coil voltage, duty cycle, and power characteristics influence thermal performance and long-term reliability. Common 24 VDC installations require stable electrical supply conditions to prevent overheating, intermittent operation, or premature coil failure.
Environmental Exposure and Hazardous-Area Conditions
Offshore installations, LNG facilities, and chemical plants expose equipment to moisture, vibration, temperature variation, and corrosive atmospheres. The ICO3S combines 316L stainless-steel construction, ATEX and IECEx certification, and IP66/IP68 protection to support reliable operation in demanding environments.
Reliable shutdown performance is determined by the interaction between pneumatic supply conditions, actuator dynamics, venting capacity, electrical operation, and installation quality. Many failures attributed to the actuator originate from unsuitable solenoid valve sizing, incorrect pneumatic architecture, or unstable operating conditions.
ICO3S Technical Specifications, Certifications, and Configuration Options
The IMI Maxseal ICO3S is a high-integrity solenoid poppet valve developed for pneumatic actuator control, Emergency Shutdown (ESD) systems, and hazardous-area automation applications. Available in multiple switching configurations and mounting options, the ICO3S combines corrosion-resistant construction with internationally recognized safety and hazardous-area certifications.
Valve Functions and Operating Logic
Available in 2/2, 3/2 universal, and 5/2 configurations for spring-return and double-acting pneumatic actuator systems. Energize-to-open and energize-to-close operating philosophies are available depending on shutdown logic requirements.
Mounting and Integration Options
Configurations include NAMUR mounting for direct actuator integration, inline installation, and manifold-mounted arrangements. Connection options include 1/4″ and 1/2″ NPT ports for flexible pneumatic system design.
Operating Pressure Capability
Standard operating pressure ratings extend up to 12 bar, with selected configurations supporting operating pressures up to 16 bar depending on valve function, pneumatic architecture, and application requirements.
Temperature Range
Operating temperatures from -55°C to +90°C support outdoor installations, offshore environments, cold-climate facilities, and hazardous-area process applications exposed to severe environmental conditions.
Construction Materials
Manufactured with a 316L stainless-steel body to provide excellent resistance against corrosion, moisture, salt exposure, and chemically aggressive environments commonly found in offshore and process industries.
Certifications and Protection Ratings
Available with ATEX and IECEx approvals for hazardous-area applications, SIL capability for safety-related systems, and IP66/IP68 ingress protection ratings to reduce exposure to dust, water, and contamination.
Electrical Options and Manual Override
Commonly supplied with 24 VDC coils and available in alternative voltage configurations. Manual override functionality supports commissioning, maintenance activities, proof testing, and controlled shutdown procedures.
Typical Industry Applications
Frequently specified for oil & gas facilities, LNG terminals, petrochemical plants, power generation assets, offshore platforms, hazardous-area automation systems, and pneumatic actuator ESD valve assemblies.
Typical ICO3S Application Environments
The IMI Maxseal ICO3S is widely applied in pneumatic actuator control, Emergency Shutdown (ESD) systems, and hazardous-area automation projects where reliable solenoid valve operation is required under demanding environmental and operational conditions. Its compact NAMUR design, corrosion-resistant construction, and hazardous-area certifications make it suitable for a broad range of industrial applications.
Emergency Shutdown (ESD) Valve Systems
Frequently installed on spring-return pneumatic actuators used for emergency isolation valves and shutdown valves where rapid venting and predictable fail-safe operation are required during emergency demand events.
Safety Instrumented Systems (SIS)
Commonly integrated into Safety Instrumented Functions (SIF) where pneumatic actuator response must remain predictable during proof testing and actual shutdown events within SIL-oriented architectures.
Pneumatic Valve Automation
Used for the control of ball valves, butterfly valves, plug valves, and other quarter-turn actuators where compact installation, reliable pneumatic operation, and simplified actuator integration are priorities.
Oil & Gas and Petrochemical Facilities
Applied throughout upstream, midstream, and downstream facilities where hazardous-area compliance, corrosion resistance, and dependable actuator control are essential for operational safety and reliability.
LNG and Cryogenic Process Infrastructure
Suitable for LNG terminals and gas-processing facilities where severe environmental exposure, outdoor installation, and critical shutdown requirements demand robust pneumatic switching performance.
Offshore and Marine Installations
The 316L stainless-steel construction and IP66/IP68 protection make the ICO3S suitable for offshore platforms, marine environments, and exposed outdoor installations where moisture and salt contamination are persistent concerns.
Although the ICO3S is frequently selected for hazardous-area ESD applications, its suitability is ultimately determined by actuator characteristics, shutdown philosophy, environmental conditions, and functional safety requirements. Correct integration remains more important than product specification alone.
Frequently Asked Questions About the IMI Maxseal ICO3S
The following questions address common engineering, specification, and application considerations for the IMI Maxseal ICO3S solenoid valve used in pneumatic actuator control, hazardous-area automation, and Emergency Shutdown (ESD) systems.
What is the IMI Maxseal ICO3S used for?
The IMI Maxseal ICO3S is a stainless-steel solenoid poppet valve designed for pneumatic actuator control, Emergency Shutdown (ESD) valves, Safety Instrumented Systems (SIS), and hazardous-area automation applications requiring reliable pneumatic switching and fail-safe operation.
Is the ICO3S suitable for ESD valve applications?
Yes. The ICO3S is widely applied in ESD valve systems where predictable venting performance, fast actuator response, and reliable fail-safe movement are required during emergency demand conditions.
Does the ICO3S support NAMUR mounting?
Yes. The ICO3S is available in NAMUR-mounted configurations that integrate directly with pneumatic actuators, reducing tubing requirements, potential leak paths, and installation complexity.
What actuator types can the ICO3S control?
The ICO3S can be configured for both spring-return and double-acting pneumatic actuators using 2/2, 3/2, and 5/2 valve functions depending on the required control logic and shutdown philosophy.
Is the ICO3S certified for hazardous-area installations?
Yes. Depending on configuration, the ICO3S is available with ATEX and IECEx certification for operation in hazardous-area environments including offshore facilities, LNG terminals, petrochemical plants, and chemical processing installations.
Can the ICO3S be used in SIL-related applications?
The ICO3S is frequently integrated into Safety Instrumented Functions (SIF) and Safety Instrumented Systems (SIS) where dependable pneumatic actuator operation forms part of the overall safety function. Final SIL suitability should always be verified within the complete system design.
What is the difference between the ICO3S and ICO4S?
The ICO3S is commonly selected for compact actuator installations and hazardous-area shutdown applications. The ICO4S provides higher flow capacity for larger actuator volumes and applications requiring increased pneumatic throughput. Selection depends on actuator size, required response time, and shutdown architecture.
What operating pressure range does the ICO3S support?
Standard configurations support operating pressures up to 12 bar, with selected variants available for applications requiring pressures up to 16 bar depending on valve configuration and system requirements.
Define Your ICO3S Application Requirements
The correct ICO3S configuration depends on actuator characteristics, operating pressure, switching logic, hazardous-area classification, and shutdown philosophy. Providing key application data helps ensure reliable pneumatic performance, appropriate certification compliance, and predictable actuator response under normal and emergency operating conditions.
• Application type (automation, ESD, SIS, shutdown valve, process isolation)
• Pneumatic actuator type, actuator size, and air volume
• Available operating pressure and pneumatic supply conditions
• Required switching speed, venting behavior, and fail-safe action
• NAMUR-mounted, manifold-mounted, or inline installation requirements
• Hazardous-area classification (ATEX / IECEx) and environmental exposure
• SIL requirements, shutdown logic, redundancy architecture, or proof-test considerations
Incorrect valve sizing, pneumatic architecture, or mounting configuration can significantly affect actuator response time and shutdown reliability, even when the solenoid valve itself operates correctly.
Request ICO3S Engineering ReviewNeed higher flow capacity for larger pneumatic actuators? Explore the IMI Maxseal ICO4S →