Pneumatic actuator is an actuator that uses air pressure to drive opening and closing or regulating valves. It is also called a pneumatic actuator or a pneumatic device, but it is generally called a pneumatic head. When the compressed air enters the pneumatic actuator from the A nozzle, the gas pushes the double pistons to move linearly towards both ends (cylinder head end). The rack on the piston drives the gear on the rotating shaft to rotate 90 degrees counterclockwise, and the valve is opened. . At this time, the gas at both ends of the pneumatic execution valve is discharged with the B nozzle. In order for the pneumatic actuator to achieve the expected results, the pneumatic actuator needs to be maintained in good working condition. Let's talk about how to maintain the pneumatic actuator in good working condition.
Routine maintenance of pneumatic actuators:
1. The purpose of using and maintaining pneumatic actuators is to extend the life of the valve and ensure reliable opening and closing.
2. The valve stem thread often rubs against the valve stem nut. Apply a little yellow dry oil, molybdenum disulfide or graphite powder for lubrication.
3. For valves that are not frequently opened and closed, the handwheel should be turned regularly and lubricant should be added to the valve stem thread to prevent seizure.
4. For outdoor valves, a protective cover should be added to the valve stem to prevent rain, snow, dust and rust.
5. If the valve is mechanically waiting to be moved, lubricating oil must be added to the gearbox on time.
6. Always keep the valve clean.
7. Frequently check and maintain the integrity of other parts of the valve. If the fixing nut of the handwheel falls off, it must be matched and cannot be used randomly. Otherwise, the upper square of the valve stem will be rounded, gradually losing the reliability of the fit, and even being unable to operate.
8. Do not rely on the valve to support other heavy objects, and do not stand on the valve.
9. The valve stem, especially the threaded part, should be wiped frequently, and the lubricant that has been contaminated by dust should be replaced with new one, because the dust contains hard debris, which can easily wear the surface of the thread and valve stem, affecting the service life.
