The Samson 3277 Pneumatic Diaphragm Actuator is a widely used linear actuator designed for precise control of globe control valves in industrial process automation systems. Known for its robust design, reliable operation, and long service life, the Samson 3277 actuator is commonly paired with Samson control valves and valve positioners to form a complete control valve assembly.
This pneumatic diaphragm actuator converts a pneumatic control signal into linear valve stem movement, enabling accurate flow, pressure, and level regulation. Its modular construction allows flexible configuration for different thrust ranges, fail-safe actions, and mounting standards, making it suitable for a wide range of applications.
| Actuator type | Pneumatic diaphragm actuator |
| Actuator action | Fail-close Fail-open Fail-in-place |
| Control signal | Pneumatic |
| Operating pressure | Suitable for standard instrument air supply |
| Thrust range | Available in multiple thrust classes depending on actuator size |
| Stroke | Various stroke lengths to match valve requirements |
| Mounting | NAMUR mounting interface for valve positioners |
| Materials | Steel housing Diaphragm materials suitable for industrial service |
| Ambient temperature | Suitable for typical industrial operating conditions |
The Samson 3277 actuator uses pneumatic pressure applied to a flexible diaphragm to generate linear force. This force moves the actuator stem, which in turn adjusts the valve plug position. When air pressure is removed, the internal spring returns the actuator to its fail-safe position, ensuring safe operation during air supply failure.
When combined with a valve positioner, the actuator achieves precise positioning and fast response to control signals.
