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Last updateFri, 29 Apr 2016 5pm

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Variable Frequency Drives in Electric Actuators

Electric actuators are vital for operating a wide variety of valves and are used in many industrial applications. Most of these actuators offer a single output speed, which may or may not be the most desirable solution for the needs of a specific application. An alternative is an electric actuator provided with an integral variable frequency drive, which allows various, speed-dependent solutions.


A Beginner’s Guide to the Right Actuator (Consider the Valve!)

A valve, in its most basic form, consists of a body and an internal moving component (closure element), which shuts off or restricts flow through the valve. To automate that valve, an actuator is added. The best way to understand valve actuation, however, is to begin by exploring the valves they will drive.

Designing for Safety: Failure Modes on Gate Valves

15 spr gateFor over 100 years, preventing catastrophic failure in the process control industry has been a continuously evolving area of study. To protect life, the environment, reputations and capital investments from compromise, we deliberate over safety and risk in every aspect of a system. As a positive result, systems of designed failure scenarios are strategically located throughout chemical refineries, power plants, floating vessels and offshore rigs. Understanding how process failure modes are achieved and where certain valves and actuation fit into the scenario is key to our efforts.

Why Quarter-turn Valves ‘Pop’ Open

We’ve all seen this situation: A quarter-turn valve is in the closed position. A pneumatic actuator applies an opening torque that exceeds what’s required to begin to open the valve. Suddenly, the valve “jumps” or “pops” open to as much as 45 degrees or more, resulting in a sudden surge of potentially disruptive flow. Why did this occur and how can we avoid this phenomenon?

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