As a common control valve accessory, the valve positioner delivers pressurized air to the valve actuator so that the position of the valve stem or shaft corresponds to the set point from the control system. Valve positioners are typically pneumatic or analog I/P and are used when a valve requires throttling action. They require position feedback from the valve stem or shaft and deliver pneumatic pressure to the actuator to open and close the valve
While a control valve positioner serves a single purpose, which is to maintain a valve at its intended control position, digital valve controllers, through their digital design, provide much more. A digital valve controller is a microprocessor-based instrument that is compatible with a variety of communication protocols, including HART, FOUNDATION fieldbus, and PROFIBUS. The microprocessor enables diagnostics and two-way communication to simplify setup and troubleshooting.
Meet specific parameters with the most accurate, robust, and reliable positioning performance in the industry. Emerson’s Fisher FIELDVUE instruments offer field-proven technology with refined electronic designs. They set the standard in reliability and performance with over 30 years of innovation, 3 million units, and 10 billion+ operating hours.
