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Introduction
In industrial settings containing potentially explosive atmospheres (Zone 1/Zone 2), ATEX-certified pneumatic rotary actuators play a critical role in ensuring safe mechanical motion. These devices comply with EU Directive 2014/34/EU (ATEX) and international standards like IECEx, designed specifically for hazardous areas where flammable gases, vapors, or dust may be present.
Key Features
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Explosion-Proof Design:
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Housing constructed from corrosion-resistant materials (e.g., aluminum with hard-coat anodization or stainless steel) to prevent spark generation.
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Non-sparking internal components and flame-path barriers to contain potential ignition sources.
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Certification Standards:
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ATEX Categories:
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Category 2G (Zone 1 – gas) / 2D (Zone 21 – dust) for high-risk environments.
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Category 3G/3D (Zone 2/22) for lower-risk areas.
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Temperature class (T1-T6) ensures safe operation within specified gas ignition thresholds.
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Performance Parameters:
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Torque range: Typically 5–3,000 Nm with 90° or 180° rotation.
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Operating pressure: 2–8 bar, adaptable to plant air systems.
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Fail-safe options (spring-return or double-acting) for emergency shutdowns.
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Industry Applications:
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Oil & gas (valve control in refineries).
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Chemical processing (mixing/reactor systems).
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Pharmaceutical (dust-prone powder handling).
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Selection Criteria
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Verify ATEX marking (e.g., "II 2G Ex h IIB T4").
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Assess environmental factors (IP rating for dust/water ingress).
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Consider maintenance needs (lubrication-free designs reduce ignition risks).
Conclusion
ATEX pneumatic rotary actuators combine intrinsic safety with robust performance, enabling reliable automation in explosive atmospheres. Proper selection and installation are crucial to maintain compliance and operational integrity.
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