Product Critical Technical Advantages
-
Integral Mounting Pad: The 657C features a cast-in mounting pad that eliminates the need for traditional mounting brackets. This design reduces the number of parts required for installation, improves structural rigidity, and ensures precise alignment between the actuator and control instruments.
-
Tubeless Instrument Integration: When paired with a Fisher FIELDVUE™ digital valve controller, the 657C utilizes an integral air passage. This internal channel eliminates the need for external tubing and fittings, removing common leak points and protecting the air signal from mechanical damage in the field.
-
High-Response Performance: The actuator is designed with a shallow casing on the pressure side, which minimizes internal air volume. This reduction in volume significantly decreases response time, allowing the valve to react faster to process signal changes and maintain tighter control loops.
-
Molded Diaphragm Efficiency: A specialized molded diaphragm travels within a deep casing, ensuring that the effective surface area remains consistent throughout the entire stroke. This results in maximum thrust for a given actuator size and highly linear force delivery.
-
Rugged Industrial Construction: Built with thick-walled cast iron and steel, the 657C provides exceptional mechanical stability and corrosion protection. This heavy-duty construction is essential for long-term durability in high-vibration areas or corrosive atmospheric conditions.
Key Specifications
| Feature | Technical Specification |
| Actuator Type | Direct-Acting (Air-to-Push Down) |
| Mounting | Integral Pad (reduces part count) |
| Air Connection | Internal (with FIELDVUE) or External Tubing |
| Material | Rugged Cast Iron and Steel |
| Diaphragm | Molded design for maximum thrust |
| Versatility | Compatible with travel stops and handwheels |
Field of Application
-
Oil and Gas Processing: Throttling control for separators and pressure regulation where fail-safe reliability is mandatory.
-
Chemical Manufacturing: Precise handling of corrosive fluids where fast actuator response improves process safety.
-
Power Generation: Automating steam and water lines with a focus on stability and high-cycle life.
-
Refining: Managing high-pressure hydrocarbon flows using robust, low-maintenance pneumatic automation.
