How is the torque for a valve calculated?

How is the torque for a valve calculated?

Valves are mainly categorized into two types: pneumatic and electric valves, with the majority on the market being of these categories. The primary distinction between pneumatic and electric valves lies in the actuators used; electric actuators tend to be more complex than pneumatic ones. When selecting between pneumatic and electric actuators, torque is a critical factor since the torque value directly influences the actuator's performance. Torque refers to the rotational force required to operate the valve. The maximum value of this rotational force is a crucial consideration in actuator selection. The calculation of this value generally derives from the total torque produced by the frictional forces from a gear engagement, bearing resistance, and the frictional interference between the seat and the disc. Due to the variable nature of friction, calculating torque can be intricate, leading to discrepancies in numerical values.