Software, Automation & Control :: Instrumentation, Automation & Control
August 1, 2012
Control Valves: An Evolution In Design
Understanding the design features of globe-style control valves can help in selection for specific applications
Emily Hoop, Emerson Process Management
Globe-style control valves are in virtually every chemical processing line where pressure and flow must be controlled. And for the most part, they perform as required, day in and day out, requiring little to no thought or attention. In short, control valves are not an everyday topic of discussion. In fact, the globe valve provides a direct contrast to today’s consumer electronics where major changes seemingly are announced and touted every year. While these valves represent an evolution of gradual change, significant improvements in control capability, reliability and breadth of application have been made in recent years.
Until about 45 years ago, globe valves with their massive body castings and rugged stem-guided valve plugs prevailed across the chemical process industries (CPI). Yet despite their wide usage and decades of service, the valves of that era were quickly replaced by a new, efficient-in-design globe-valve body that utilized interchangeable, drop-in trim packages to meet a wide range of control needs. This article answers the “what” and “why” questions about the changes in control valve design, and in doing so, offers readers a better understanding of what valve features are available and how they may apply to particular application needs....
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