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How does torque affect butterfly valve actuator selection

2025-05-19

Torque is a crucial factor in butterfly valve actuator selection as it directly impacts the actuator's ability to operate the valve effectively. Here's how:

Ensuring proper operation: The actuator must provide sufficient torque to overcome the resistance forces acting on the butterfly valve, such as those from the fluid pressure, valve seat friction, and any external loads. If the selected actuator has insufficient torque, it may fail to fully open or close the valve, leading to inaccurate flow control and potential system malfunctions.

Preventing damage: Selecting an actuator with too much torque can also be problematic. Excessive torque can cause over - stress on the valve components, such as the stem, shaft, and bearings, leading to premature wear and possible damage. This can reduce the valve's lifespan and increase maintenance costs.

Sizing the actuator: To select the appropriate actuator, the required torque should be calculated based on the valve size, pressure differential across the valve, and the type of fluid. Manufacturers usually provide torque - requirement tables or formulas for different valve models. The actuator's torque - output capacity should then be matched to or slightly exceed the calculated torque requirement to ensure reliable operation under all expected operating conditions. In summary, a careful consideration of torque is essential to ensure the proper functioning and longevity of the butterfly valve and its actuator.

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