Wuxi Xinming explains the performance indicators of pneumatic actuators
Pneumatic actuators are actuators that use air pressure to drive opening and closing or adjusting valves. They are also called pneumatic actuators or pneumatic devices, but they are generally called pneumatic heads. Pneumatic actuators are sometimes equipped with certain auxiliary equipment
Set. Commonly used are valve positioners and handwheel mechanisms. The function of the valve positioner is to use the feedback principle to improve the performance of the actuator, so that the actuator can realize accurate positioning according to the control signal of the controller. The role of the handwheel mechanism
When the control system is due to power outage, gas outage, no output from the controller or failure of the actuator, it can be used to directly manipulate the control valve to maintain the normal production.
Performance indicators of pneumatic actuators:
1. The rated output force or torque of the pneumatic device should meet the requirements of GB/T12222 and GB/T12223
2. Under no-load conditions, input the specified air pressure into the cylinder, and its action should be stable without jamming and crawling.
3. Under the air pressure of 0.6MPa, the output torque or thrust of the pneumatic device in the opening and closing directions should not be less than the value indicated on the pneumatic device label, and the action should be flexible, and no permanent deformation or permanent deformation of each part is allowed. Other abnormal phenomena.
4. When the sealing test is performed with the working pressure, the amount of air leaking from the respective back pressure side is not allowed to exceed (3+0.15D) cm3/min (standard state); the air leaking from the end cover and output shaft The amount is not allowed to exceed (3+0.15d) cm3/min.
5. The strength test is carried out with 1.5 times the working pressure. After the test pressure is maintained for 3 minutes, no leakage and structural deformation are allowed in the end cover and static seal of the cylinder.
6. The number of operating life cycles. The pneumatic device simulates the action of a pneumatic valve. The number of opening and closing operations should not be less than 50000 (one opening-closing cycle is one) while maintaining the output torque or thrust capacity in both directions.
7. Pneumatic device with buffer mechanism, when the piston moves to the stroke end position, no impact phenomenon is allowed.
