Isolation or insufficient flow can result in instantaneous overpressurization and/or explosions; therefore, the proper positioning of isolation and throttle valves is crucial to the safe operation of any system. Gate, globe, needle, and butterfly valves are all used to stop, start, and throttle flow.
"Describe the construction and operation of gate valves.
Describe the construction and operation of globe valves.
Describe the construction and operation of needle valves.
Describe the construction and operation of butterfly valves."
You will not be required to pass the knowledge check questions to move on to the next lesson. These will not be counted as a grade, but each question gives you insight into what you should have learned and the sorts of things you'll need to remember moving forward.
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