* Published bufferfly valve torque = 100Nm

* Operating medium= non-lubricated dry air

* Safety factor=100Nm+40%=140Nm

* Air supply pressure available=4.5 bar

* The spring return actuator selected is the SC00450 (9 springs) with a most similar ending torque of 1 48Nm at 4.5 bar according to the SC output

torque table. (The relative balance of torques between air supply pressure and spring return should be noted.)