Critical Technical Advantages
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High-Force Capability: Engineered for power, the 585C can produce maximum thrusts up to 111 kN (25,000 lbf), depending on the specific construction. This high thrust-to-size ratio allows for the reliable operation of valves against significant process forces.
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Stiff and Precise Positioning: The double-acting design utilizes air pressure on both sides of the piston, providing a “stiff” response that resists aerodynamic or hydrodynamic buffeting. This results in superior throttling accuracy and stability in high-flow applications.
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Modular Failsafe Options: While primarily double-acting, the 585C (sizes 25 and 50) can be equipped with internal bias springs. These springs provide a mechanical fail-safe mode—either extending or retracting the stem—upon the loss of supply air, ensuring process safety.
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Standardized Mounting and Vibration Resistance: Featuring universal NAMUR mounting, the 585C ensures a consistent and secure interface with instruments. This mounting style is specifically designed for vibration resistance in accordance with ISA-S75.13, protecting the integrity of the control signal.
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Reduced Friction and Longevity: The actuator incorporates low-friction piston seals and specialized cylinder coatings. These features minimize sliding friction and mechanical wear, leading to a longer service life and more consistent control over thousands of cycles.
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Manual Override Versatility: For manual positioning during maintenance or power loss, the 585C offers flexible handwheel options. Sizes 25 and 50 support top-mounted handwheels, while larger sizes are compatible with rugged side-mounted manual operators.
Technical Specifications and Capabilities
| Feature | Details |
| Actuator Type | Double-Acting Pneumatic Piston |
| Maximum Thrust | Up to 111 kN (25,000 lbf) |
| Maximum Stroke | Up to 203 mm (8 inches) |
| Mounting Standard | Universal NAMUR (ISA-S75.13 compliant) |
| Fail-Safe Mode | Double-acting (standard) or Bias Spring (optional for sizes 25/50) |
| Manual Operator | Top or Side-mounted handwheels available |
Primary Applications
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High-Pressure Steam Control: Precise modulation in EH and HP series valves for power plant and boiler applications.
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Hydrocarbon Processing: Stable throttling in refineries where high process pressure requires stiff actuator response.
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Chemical Production: Reliable automation for easy-e™ globe valves in corrosive or high-cycle environments.
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Severe Service Loops: Management of high-pressure drops where diaphragm actuators may lack the necessary stiffness.
