Overview
The Fisher Controls ESA-100-DSA-4/A is a compact pneumatic actuator engineered for reliable valve control in industrial automation systems. Featuring the Posi-Seal design and Type 1035 rack-and-pinion mechanism, this unit delivers precise actuation in process control and isolation applications. The dual-stop adjustment (DSA) feature provides adjustable travel range for optimal valve positioning.
Key Features
- Rack-and-pinion mechanism for smooth, linear valve actuation
- Spring return design—fails to a predetermined safe position on air loss
- Dual-stop adjusters (DSA-4) enable precise travel limiting
- Rated for continuous operation at 120 PSIG
- Compact size suitable for tight valve manifold installations
- Proven Posi-Seal construction for industrial reliability
Technical Specifications
Typical Applications
- Isolation and on-off valve control
- Process control loops requiring proportional or modulating action
- Chemical, oil & gas, water treatment, and power generation plants
- HVAC and building automation systems
- Pilot-operated or pilot-to-open butterfly and ball valve systems
Compatibility & Replacements
Compatible With
- Fisher control valve bodies (2-way, 3-way butterfly and ball valve configurations)
- Standard pneumatic supply systems (compressed air)
- Positioner systems compatible with Posi-Seal actuator flanges
- Proportional control valve packages with 4-20 mA feedback
Replaces / Drop-In Replacement For
- Earlier Posi-Seal ESA-100 versions without dual-stop adjustment
- Verify compatibility with your system integrator or controls engineer before ordering to ensure correct actuator size and air supply configuration.
Works With
- Pneumatic pilot signal systems (solenoid valve control)
- Analog positioner feedback (4-20 mA)
- Standard compressed air supply (40–120 PSIG operation)
- Industrial valve manifolds and flanged valve bodies
