Critical Technical Advantages
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Integral Mounting and Tubeless Integration: The 667R features a cast-in integral mounting pad that eliminates the need for traditional bolt-on brackets. When paired with Fisher FIELDVUE™ digital valve controllers, an internal air passage allows for a tubeless connection. This design significantly reduces the number of parts, minimizes potential leak points, and protects the pneumatic signal from mechanical damage.
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Rapid Response Dynamics: A shallow casing on the pressure side of the diaphragm reduces internal air volume. This specialized geometry ensures a faster response to pneumatic signal changes, enabling the 667R to maintain tighter control in sensitive or high-speed process loops.
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Linear Thrust Performance: The actuator utilizes a molded diaphragm that travels within a deep casing. This architecture minimizes the change in effective diaphragm area throughout the entire stroke, delivering maximum thrust for its size and ensuring consistent, linear stem movement.
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Rugged Industrial Construction: Built with thick-walled cast iron and steel, the 667R provides exceptional mechanical stability and superior protection against atmospheric corrosion. Its heavy-duty construction is specifically engineered to withstand the vibrations and harsh conditions typical of refineries and power plants.
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Versatile Customization: The 667R is compatible with a wide array of spring rates, travel stops, and manual operators (handwheels). While optimized for modern integral mounting, it remains fully compatible with instruments that utilize traditional bracket-based mounting kits, providing flexibility for diverse fleet requirements.
Technical Specifications and Capabilities
| Feature | Details |
| Actuation Action | Reverse-Acting (Air-to-Push Up) |
| Mounting System | Integral Pad (for simplified installation) |
| Pneumatic Interface | Internal Air Passage (Tubeless) or External |
| Construction Material | Heavy-duty Cast Iron and Steel |
| Diaphragm | Molded design for maximum thrust-to-size |
| Compatibility | Supports 657 and 667 standard accessories |
Primary Applications
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Petrochemical Refining: Precise management of hydrocarbon flows requiring reliable reverse-acting performance.
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Power Generation: Automated control of steam and water cycles where high-thrust stability is required.
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Chemical Manufacturing: Throttling control for volatile media where fast actuator response improves safety.
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Utilities and Water Treatment: Dependable on/off and modulation for large-scale industrial fluid distribution.
