Selection issues for angular travel actuators
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For the selection of angular travel actuators, after applying a safety factor of 1.3, the torque required is not sufficient when using a rated air pressure of 5 bar; a pressure of 5.5 bar is necessary to meet the required torque. My question is: since the angular travel actuator is rated for a supply pressure of 5 Bar, can it be used continuously with a pressure of 5.5 Bar in order to meet the torque requirements? Should I choose a larger actuator and use a rated actuator to meet the torque requirements?
The difference isn’t significant; it can certainly be used for a long time. The pressure is not high, staying within normal limits. Ordinary domestic pneumatic actuators will do just fine. If cost isn’t a concern, one can certainly opt for a cylinder of a larger size
Not at all, we happen to work in this field, so it’s great to exchange ideas with everyone
Could you please explain in more detail what the safety factor of 1.3 refers to? What is multiplied by 1.3? How did you get this 1.3?
First, determine the torque required to open and close the valve; under normal operating conditions, a safety factor of 15~20% is recommended. For water vapor or non-lubricating liquids, it is increased to 25% of the safety value; for non-lubricating slurry liquids, it is increased to 40% of the safety value. The proportion of non-lubricated granular powder has been increased to 80%. Of course, the torque of actuators produced by different manufacturers varies; it is necessary to refer to the torque tables provided by the manufacturers in order to select the appropriate one.
You also need to determine whether the actuator is single-acting or double-acting. In the case of a single-acting actuator that reverts due to the spring, increasing the air supply pressure only increases the torque on the pneumatic side; the torque exerted by the spring does not increase.