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May 04, 2020

Difference between single action and double action of pneumatic actuator

Principle of difference between single action and double action of pneumatic actuator:

The difference between single action and double action of pneumatic actuator when the compressed air enters the pneumatic actuator from the a nozzle, the gas pushes the double piston to move in a straight line towards both ends (cylinder head end), the rack on the piston drives the gear with the function of rotating shaft lying to rotate 90 degrees anticlockwise, and the valve is opened. At this time, the gas at both ends of the pneumatic actuator valve is discharged with the B nozzle. On the contrary, when the compressed air enters the two ends of the actuator from the B nozzle, the gas pushes the double plug to move in a straight line towards the middle, and the rack on the piston drives the gear of the rotating shaft to rotate 90 degrees clockwise, and the valve is closed. At this time, the gas in the middle of the pneumatic actuator is discharged with the a nozzle. The above is the transmission principle of standard type. According to the user's requirements, the pneumatic actuator can be installed in the opposite transmission principle of the standard type, that is, select the clockwise rotation of the shaft to open the valve, and the counterclockwise rotation to close the valve. The nozzle a of single acting (spring return type) pneumatic actuator is the air inlet, and the nozzle B is the exhaust port (muffler shall be installed for the nozzle b). The air inlet of nozzle a is to open the valve. When the air is cut off, the valve is closed by spring force.

Features of pneumatic actuator:

1. Compact double piston rack structure, precise engagement, high efficiency, constant output torque.

2. The aluminum cylinder block, piston and end cover are the lightest compared with actuators of the same specification structure.

3. The cylinder body is made of extruded aluminum alloy, which is treated by hard anodizing. The inner surface is hard, strong and hard. The sliding bearing made of low friction material avoids the direct contact between metals, has low friction coefficient, flexible rotation and long service life.

The connection between pneumatic actuator and valve shall conform to ISO5211 standard:

The air supply hole complies with Namur standard. The bottom shaft assembly hole of pneumatic actuator (in accordance with ISO5211 standard) is double square, which is convenient for linear or 45 ° angle installation of valve with square bar. The top and top holes of the output shaft are Namur compliant. The adjustment screws at both ends can adjust the opening angle of the valve. The same specification has double acting type and single acting type (spring return). According to the valve needs to choose the direction, clockwise or counter clockwise rotation. Install Solenoid Valve, positioner (opening indication), air filter, various limit switches and manual operation devices according to the user's needs.
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