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Inspection Methods for Pneumatic Actuators (Part I)


Release time:

2022-07-20

Today, by Wuxi Xinming automatic control valve industry Co., Ltd. for you to introduce in detail the inspection method of pneumatic actuator (on): Pneumatic valves are now used more and more widely in various industries, and the technology of pneumatic actuators is getting better and better. The distance between domestic pneumatic actuators and imported pneumatic actuators is getting smaller and smaller, and there are more and more types. Introduce several inspection methods of pneumatic actuator for you: 1. Fix the pneumatic actuator on the calibration table, and separate and connect the air source, control the air source and displacement detection connecting rod; Adjust the calibration table accurately; 2. Mechanical zero calibration: input 4ma current signal (0%), control air signal should be 0.02mpa, and cylinder piston stroke should be zero at this moment; If it is not zero, the zero point can be adjusted by adjusting the nut on the zero adjustment screw (the zero point is higher than the nut); Repeated adjustment of zero point and range requirements; Zero point error should be ≤ 1%; 3. Mechanical full-scale calibration: input 20ma current signal (100), control air signal should be 0.10mpa, and cylinder piston stroke should be the upper limit value at this moment; If it is not the upper limit value, the range can be adjusted by adjusting the tightness of the range tension spring (the range is smaller than the loose tension spring, and the range is larger than the tight tension spring); Zero and range requirements are repeatedly adjusted; Full scale error ≤ 1%; 4. Positioning of the midpoint of the measuring range: After the zero point and the measuring range are aligned, input 12ma current signal (50%, 0.06mpa), and adjust the orientation of the connecting rod of the azimuth transmitter so that it is straight with the horizontal plane at this point; 5. Full stroke error calibration: input the control air signal 0.02mpa(0%), and then gradually add the input signal 0.036 mpa(20%), 0.052 mpa(20%), 0.068 mpa(60%), 0.084 mpa(80%), 0.1 mpa(100) to make the piston go through the full stroke, and all errors should be ≤ 1.5; 6. Non-linear error test: input the control air signal of 0.02mpa(0%), then gradually add the input signal until 0.10mpa(100), then reduce the signal to 0.02mpa(0%), make the actuator go through the full stroke, and record the stroke value corresponding to the signal pressure of 0.008mpa, and the nonlinear error between the actual pressure-stroke connection and the theoretical value shall be ≤ 1%;※ 7. Positive and negative stroke variation test: the same as the nonlinear error test method, the upper limit of the difference between the positive and negative stroke values of the cylinder piston under the same pressure value is ≤ 1% in the actual positive and negative pressure-stroke connection; The above is the above part of the inspection method of pneumatic actuator introduced in detail by Wuxi Xinming automatic control valve industry co., ltd. if you have any questions about pneumatic actuator, please feel free to call for advice and wait for your cooperation.

Inspection Methods for Pneumatic Actuators (Part I)

Today, by Wuxi Xinming automatic control valve industry Co., Ltd. for you to introduce in detailPneumatic actuatorThe inspection method (above):

气动执行器
Pneumatic valves are now used more and more widely in various industries,Pneumatic actuatorThe technology is getting better and better, and the distance between domestic pneumatic actuators and imported pneumatic actuators is getting smaller and smaller, and there are more and more types. Introduce several inspection methods of pneumatic actuator for you:
1. Fix the pneumatic actuator on the calibration table, and separate and connect the air source, control the air source and displacement detection connecting rod; Adjust the calibration table accurately;
2. Mechanical zero calibration: input 4ma current signal (0%), control air signal should be 0.02mpa, and cylinder piston stroke should be zero at this moment; If it is not zero, the zero point can be adjusted by adjusting the nut on the zero adjustment screw (the zero point is higher than the nut); Repeated adjustment of zero point and range requirements; Zero point error should be ≤ 1%;
3. Mechanical full-scale calibration: input 20ma current signal (100), control air signal should be 0.10mpa, and cylinder piston stroke should be the upper limit value at this moment; If it is not the upper limit value, the range can be adjusted by adjusting the tightness of the range tension spring (the range is smaller than the loose tension spring, and the range is larger than the tight tension spring); Zero and range requirements are repeatedly adjusted; Full scale error ≤ 1%;
4. Positioning of the midpoint of the measuring range: After the zero point and the measuring range are aligned, input 12ma current signal (50%, 0.06mpa), and adjust the orientation of the connecting rod of the azimuth transmitter so that it is straight with the horizontal plane at this point;
5. Full stroke error calibration: input the control air signal 0.02mpa(0%), and then gradually add the input signal 0.036 mpa(20%), 0.052 mpa(20%), 0.068 mpa(60%), 0.084 mpa(80%), 0.1 mpa(100) to make the piston go through the full stroke, and all errors should be ≤ 1.5;
6. Non-linear error test: input the control air signal of 0.02mpa(0%), then gradually add the input signal until 0.10mpa(100), then reduce the signal to 0.02mpa(0%), make the actuator go through the full stroke, and record the stroke value corresponding to the signal pressure of 0.008mpa, and the nonlinear error between the actual pressure-stroke connection and the theoretical value shall be ≤ 1%;※
7. Positive and negative stroke variation test: the same as the nonlinear error test method, the upper limit of the difference between the positive and negative stroke values of the cylinder piston under the same pressure value is ≤ 1% in the actual positive and negative pressure-stroke connection;







气动执行器
The above is the above part of the inspection method of pneumatic actuator introduced in detail by Wuxi Xinming automatic control valve industry co., ltd. if you have any questions about pneumatic actuator, please feel free to call for advice and wait for your cooperation.