The device shown in the illustration is used...

Question 1 of 270705eccef9bbacbc34ba4d453eb

The device shown in the illustration is used to open and close a butterfly valve. The motor will be typically secured during the closing phase by the use of the __________. See illustration GS-0027.

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Question 1 of 27070

The device shown in the illustration is used to open and close a butterfly valve. The motor will be typically secured during the closing phase by the use of the __________. See illustration GS-0027.

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🔍 Key Concepts

• Torque switch vs. limit switch – what each one senses in an electric valve actuator • How a butterfly valve reaches the fully closed position (disc against the seat) • Protection of the valve, disc, and gearbox from overstress at the end of travel

💭 Think About

• When the valve is closing, what physical condition changes first: the valve disc reaching its end of travel, or the load on the motor increasing sharply? • Which device in an actuator is intended to stop motion at a specific position, and which is intended to stop motion when force or resistance gets too high? • Look at the illustration: which component is mounted to sense torque/load through the gearing, and which is arranged to sense travel/position of the shaft?

✅ Before You Answer

• Identify in the illustration where end-of-travel is detected versus where over-torque is detected • Decide which device is normally relied on during closing of a seated butterfly valve to prevent damage to the seat and disc • Confirm whether a manual pushbutton alone would be enough to protect the mechanism from over-travel or overload