Shafer Valve Actuators | Emerson US Emerson’s Shafer valve actuation portfolio answers flow control’s toughest automation, safety and productivity challenges. guardian of the pipeline. Skip to Navigation; Safety Instrumented Systems (SIS) Marine Integrated Control & Monitoring.[PDF] November 2021 Rosemount 5900S Reference Manual Read this manual before working with the product. For personal and system safety, and for optimum product performance, ensure you thoroughly understand the contents before installing, using, or maintaining this product. For equipment service or support needs, contact your local Emerson Automation Solutions/Rosemount Tank Gauging representative.