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Today’s automation industry quiz question comes from ISA’s new course, Control Valve Mechanics and Operations from Analog to Digital. The class, which is offered June 22-26, takes a deep dive into the control valve’s mechanical composition, actuation and positioning accessories, including a detailed study of digital valve controllers. The class is hands-on and lab intensive, and is designed to offer a real-world, working knowledge of valve mechanical configurations, valve operations and positioner calibrations.
Failsafe positions for a valve can be:
A) Fail Closed
B) Fail Open
C) Fail Last or Locked
D) All of the above
Quiz Bonus: Use coupon code JUNTS18 when you register for the course to get the class at 50% discount. Register at this page: http://bit.ly/1ElxhX0
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The correct answer is D, all of the above.
The actuator action and mounting position determine the fail state of the valve package. The arrow on the stem of a two-way actuator shows if the valve/actuator package is a fail open or fail closed. On three- and four-way actuators the arrows show the failed paths. The letters “FO” (fail open) and “FC” (fail closed) are sometimes used in place of the arrows on two way valves. The letters “FIP” also are used to refer to a valve that Fails In Place.
Want to learn more about control valves? Sign up for ISA’s new course, Control Valve Mechanics and Operations from Analog to Digital. Use the special quiz discount code JUNTS18 when you register for the course to get the class for half off. Register at this page: http://bit.ly/1ElxhX0