Core Technical Advantages
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High-Pressure Capability: Unlike standard positioners limited to low-pressure air, the 3570 family can handle supply pressures up to 10.3 bar (150 psig). This allows it to drive large cylinder actuators with enough force to shut off against extreme process pressures.
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Low-Profile Yokeless Design: Many versions feature a compact, yokeless construction. By mounting directly to a bracket or bonnet flange, the overall height of the valve assembly is reduced, making it ideal for tight piping skids and areas with low overhead clearance.
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Versatile Actuator Support: While optimized for pneumatic pistons, the 3570 is flexible enough to be used with long-stroke cylinders or pneumatic diaphragm actuators, providing a unified control platform across different valve types.
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Field Reversibility: The action of the positioner and actuator can be reversed in the field quickly. This means you can switch from Air-to-Open to Air-to-Close without purchasing additional conversion kits or spare parts.
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Precision Response: Sensitivity and travel span are factory-calibrated but easily adjustable. The design minimizes deadband, ensuring the valve reacts immediately to even the smallest change in the controller’s signal.
Technical Core
| Feature | Technical Specification / Detail |
| Input Signal | 0.2 to 1.0 bar (3 to 15 psig) or 0.4 to 2.0 bar (6 to 30 psig) |
| Max Supply Pressure | 10.3 bar (150 psig) |
| Max Valve Travel | Up to 206 mm (8.125 inches) |
| Linearity | +/- 1% of output span |
| Hysteresis | 0.5% of output span |
| Operating Temp | Standard: -40 to 71°C (-40 to 160°F) |
| Mounting | Yokeless, bracket-mounted, or direct-flange |
Applications and Industry Sectors
The 3570 is typically specified for large-bore valves or high-pressure steam/gas applications where accuracy must be paired with significant mechanical force.
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Power Generation: Controlling large steam turbine bypass valves and high-pressure feedwater heaters.
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Oil & Gas Midstream: Operating heavy-duty dampers and large ball or gate valves in gas processing plants.
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Chemical Production: Managing high-cycle throttling valves in reactors where rapid, precise stem positioning is critical for safety.
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Pulp & Paper: Driving large-diameter control valves in digester and bleaching lines.
Xi’an Yunrui Trading Co., Ltd. Technical Support
Xi’an Yunrui Trading Co., Ltd. is a major supplier of Fisher brand products, providing a comprehensive range of Fisher solutions. We specialize in providing original, high-efficiency Emerson automation solutions to industrial clients. Beyond supplying core hardware like the 3570 Positioner, we leverage deep technical expertise to provide professional support and model selection guidance for procurement and engineering projects. By optimizing our supply chain, we provide a distinct pricing advantage, ensuring we offer highly competitive prices while assisting clients in optimizing processes and achieving digital upgrades.
If you are currently troubleshooting a high-vibration application and need to verify the correct snubber configuration for your 3570 assembly, please contact our technical team for a review.
