How to choose Puretorq actuator

Double acting actuator
The suggested safety factor for double acting actuators under normal working conditions is 20%-30%.
Example:
The torque needed by valve=100Nm
The torque considered safety factor (1+30%)=130Nm
Air supply=5.5Bar
According to the above table, we can choose the minimum model is VDA 1100.

Spring return actuator
The suggested safety factor for spring return actuator under normal working conditions is 20-30%.
Example:
The torque needed by valve=70Nm
The torque consider safety factor (1+30%) = 91Nm
Air supply=5.5Bar
According to the table of spring return actuators output, we find output torque of VSR1000(1-1/4Turn) is:
Air stroke 0º=118.7Nm
Air stroke 90º=99.1Nm
Spring stroke 90º=122.4Nm
Spring stroke 0º=102.8Nm
All the output torque is large than we needed.

Attention: The preload of spring star mark means preload in factory before delivery, the clients may request they are needed torque according to table data.