english 
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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