Pneumatic Actuator Other Related

Double acting actuator
The selection of double-acting actuators takes the DA series pneumatic actuators as an example. The output torque of the rack-type actuator is the piston pressure (supplied by the air source pressure) multiplied by the pitch circle radius (force arm). And the friction resistance is small and the efficiency is high. , the output torque is linear when rotating clockwise and counterclockwise. Under normal operating conditions, the recommended safety factor for double-acting actuators is 25-50%
single acting actuator
The selection of Mingjing single-acting actuators takes the SR series pneumatic actuators as an example. In the application of spring return, the output torque is obtained during two different operations. According to the stroke position, each operation produces two different torque values. . The output torque of the spring return actuator is obtained by multiplying the force (air pressure or spring force) by the force arm. The first situation: the output torque is obtained by the air pressure entering the middle cavity to compress the spring, which is called "air stroke output torque". In this case, the air source pressure forces the piston from 0 degrees to 90 degrees. Due to the reaction force generated by the compression of the spring, the torque gradually decreases from the maximum value at the starting point until it reaches the second situation: the output torque is the spring recovery when the middle cavity loses air. The force acting on the piston is called "spring stroke output torque". In this case, due to the extension of the spring, the output torque gradually decreases from 90 degrees to 0 degrees. As mentioned above, the single-acting actuator is based on the two It is designed on the basis of generating a balanced moment under such conditions. In each case, it is possible to obtain an unbalanced torque by changing the relationship between the number of springs per side and the air supply pressure (e.g. 2 springs per side and 5.5 bar air supply or vice versa). Two conditions can be obtained in spring return applications. : Loss of air is on or loss of air is off. Under normal operating conditions, the recommended safety factor for spring return actuators is 25-50%
Examples of spring return actuators (see also technical data sheet):
Spring close (lost air)
*Ball valve torque=80NM
*Safety factor (25%)=80NM+25%=100NM
*Air source pressure=0.6MPa
The selected SY-SR actuator is SR125-05 because it can produce the following values:
*Spring travel 0o=119.2NM
*Spring travel 90o=216.2NM
*Air stroke 0o=228.7NM
*Air stroke 90o=118.8NM