Overview
The Samson 3271-350CM pneumatic diaphragm actuator is a proven component for precision control of industrial valves up to 20″ globe control valves. This 350 cm² effective area unit integrates with the Samson 0520-0525 diaphragm module and supports both spring-return and double-acting configurations. Built for repeatability and durability across chemical processing, power generation, oil & gas, and HVAC systems.
Key Features
- Field-reversible design allows fail-safe action configuration changes on-site
- Multi-spring internal construction for reliable, consistent stroke force
- Compatible with 350 cm² diaphragm module (Samson 0520-0525)
- Linear motion output suitable for valve stem engagement and modulation
- Compact, lightweight design reduces integrated valve height and weight
- Manual override handwheel option available for maintenance and emergency operation
Technical Specifications
- Actuator Type: Rolling diaphragm, pneumatic
- Effective Area: 350 cm²
- Matching Diaphragm: Samson 0520-0525
- Fail-Safe Modes: Spring-return or double-acting (field configurable)
- Application Range: Micro-flow to large globe control valves (up to 20″)
- Control Method: Pilot air supply pressure and internal spring preload
- Stroke Force: Dependent on air supply pressure, spring stiffness, and spring preload
- Manual Operation: Optional side-mounted handwheel for manual actuation
Typical Applications
- Chemical and petrochemical plant valve automation
- Power plant steam and feedwater control systems
- HVAC and building automation control loops
- Oil & gas production and refining facilities
- Water treatment and utility valve modulation
- Process heating and cooling loops requiring proportional control
Compatibility & Replacements
Compatible With
- Samson Type 3241 and Type 3251 pneumatic control valves
- Samson Series 240, 250, and 290 valve configurations
- Standard valve mounting flanges (ISO and ANSI patterns)
- Compressed air systems at typical industrial supply pressures (3–7 bar)
- Pneumatic positioners and control loops
Replaces / Drop-In Replacement For
- Earlier Samson 3271-350 units (same 350 cm² effective area)
- Direct equivalent for 350 cm² area pneumatic actuator applications
- Verify mounting footprint and connection pattern with your system integrator before ordering
Works With
- Samson pneumatic positioners (3277-series and integral models)
- Pneumatic supply conditioning (filters, regulators, lubricators)
- Pilot-air control systems and solenoid valve networks
- Process control instrumentation and SCADA systems monitoring valve position
- Standard pneumatic tubing and quick-disconnect couplings
