What are the advantages and disadvantages of the two functions of the pneumatic ball valve actuator?
Pneumatic ball valve actuator is divided into double action and single action two modes of work.Working principle of double action mode:When the compressed air enters the middle cavity between the two pistons of the cylinder from the air inlet (2), the two pistons are separated and moved toward the two ends of the cylinder, and the air at the two ends of the air chamber is discharged through the air port (4). At the same time, the two piston rack synchronously drives the output shaft (gear) to rotate in an anticlockwise direction. On the contrary, when the air source pressure passes through the air inlet (4) into the air chamber at the end of the cylinder, the two piston moves toward the middle of the cylinder, and the air in the middle air cavity is discharged through the air port (2). At the same time, the two piston rack synchronously drives the output shaft (gear) to rotate in clockwise direction. (if the piston is mounted in opposite directions and the output shaft rotates in reverse direction, that is, double acting reverse type).
From the above work principle can be seen: double acting pneumatic actuator, valve opening and valve closing all need compressed air thrust to perform. That is to say, the pneumatic actuator will remain in a position in case of loss of air.The single acting actuator belongs to the automatic reset type. After losing the continuous air pressure, the actuator will drive the valve back to the initial setting position under the tension of the spring.This answer is recommended by users
The working principle of the single action mode:When the air pressure from the air intake (2) between the two piston into the cylinder cavity, the two ends of the cylinder piston moves to the separation direction, forcing the ends of the compression spring, both ends of the air chamber air through the air intake (4) discharged, while making two piston rack synchronous drive output shaft (gear) counterclockwise. In the air pressure through the solenoid valve for cylinder piston to move backwards, two to the middle direction in the spring, the middle air cavity air from the air outlet (2) discharged, while making two piston rack (gear) synchronous drives the output shaft to rotate clockwise. (if the piston is mounted in opposite directions and the spring is reset, the output shaft becomes reverse rotating, i.e., single acting reverse type)
