Valve controllers play a vital role in industrial processes, ensuring that control valves are positioned accurately under changing process conditions. Building upon fifty years of valve controller improvements, the new Fisher™ FIELDVUE™ DVC7K digital valve controller...
Emerson’s Fisher Instruments has been producing its Wizard pneumatic controllers since the 1940s, refining and revamping them every 20 years or so. Along the way, the company produced its electro-pneumatic controllers, and more recently developed its Fisher™ FIELDVUE™ digital pneumatic controllers (DPC). In all, Emerson estimates there are more than 1 million of its pneumatic controllers presently operating.
The Fisher FIELDVUE DVC7K digital valve controller offers Advice at the Device technology with real-time analytics for valve health diagnostics and prescriptive corrective actions. In a ControlGlobal.com article, Advice at the device—and remotely, Emerson’s Tom Brandau is quoted on the history of digital valve controller technology.
I’ve often written about how digital valve controllers improve control valve performance and ongoing maintenance. But how about on-off valves? In this Valve World Americas featured story, How Digitized On-Off Valves Improve Operations, Emerson’s Riyaz Ali explains how...
Highly secure connections to plant automation systems and intelligent field instruments are enabling Emerson to provide remote monitoring services, helping processing companies and manufacturers to achieve significant operational benefits without having to develop in-house data analysis expertise.
Saurabh Pathak & Naman Tahan share how advances in digital valve controllers, diagnostic software & network communications are enabling significant reductions in maintenance costs & unplanned outages.
For air-operated control valves, the pneumatic power at a constant supply pressure is proportional to the mass flow rate of instrument air. The pneumatic/eletro-pneumatic/microprocessor-based digital valve controller is used on most control valves operated in closed-loop control, where the input signal is continuously changing.
Riyaz Ali discussed with a major international oil company ways to eliminate supply line relief valves or needs for higher pressure-rated actuators should the air filter regulator (AFR) fail.
In a Plant Engineering article, Advanced valve diagnostics drive savings, Jordan Mandernach and Emerson’s Brent Baker teamed up to share these diagnostics in digital valve positioners can help drive safety, reliability and efficiency improvements in the process.
The DVC6200 HW2 digital valve controller provides a unique feature to detect position feedback issues and automatically revert from travel control to pressure control (I/P transducer mode) to keep the valve operational. This can help avoid costly unplanned spurious trips that can affect plant operation.
In a post, Valve Travel Control-Pressure Fallback, Emerson’s Riyaz Ali shared the process of how a control valve with a digital valve controller could fall back to standard pressure control upon an issue with the travel sensing mechanism.
A Digital Valve Controller, the DVC6200 (HART or Foundation Fieldbus) can detect position feedback problems and automatically revert to I/P [current to pressure] transducer mode to keep the valve operational. This avoids costly unplanned spurious trips, which are critical for plant operational performance.
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The opinions expressed here are the personal opinions of the authors. Content published here is not read or approved by Emerson before it is posted and does not necessarily represent the views and opinions of Emerson.