The working principle of the pneumatic actuator mechanism

Working principle of the pneumatic actuator agencies


n. m = [cylinder torque ]






the valve opened to 90 ° a


the valve open to 0 ° a





the single-acting cylinder












the single-acting: 1, there is no air pressure by spring force close valve
for P Max at 90 ° when closing force. Spring in H3
closed 0 ° closing force for P Max. Spring in H1
the conclusion that the single-acting cylinder is made of small spring force will flow valve
2, inlet opening moment:
[ Gas P * S piston - P Max] X
> valve torque gear circle radius ∴ P higher gas, other values are constant
S piston is higher, the model is higher, the higher the price the price
the conclusion that opened to 90 ° is air force minus the big difference of spring force to open the valve and fixed air pressure is required.









CCW（ Anticlockwise)


compressed air to port A forces the pistons to the opposite direction, output shaft counterclockwise, two side of piston air is being exhausted from port B.





CW（ Clockwise direction)
the compressed air to port B forces the pistons inwards, the output shaft clockwise rotation, two pistons in the middle of the air is being exhausted from port A.








CCW（ Anticlockwise)
compressed air to port A forces the pistons to the opposite direction, the output shaft rotate counterclockwise, the air is being exhausted from port B.





CW（ Clockwise direction)


loss of air pressure, the result of the action of the spring makes the pistons inwards, the output shaft clockwise rotation, the air is being exhausted from port A