Why is the pointer of the pneumatic water seal ball butterfly valve installed upstream of the flow control valve? Throttle valve is widely used in industrial control and is an essential control terminal device in pipe network system. In some industrial environments with strong interference factors, butterfly valves are required to have high control accuracy and fast response speed, as well as strong adaptability and robustness. The regulating performance of butterfly valve mainly depends on its actuator, and electric actuator, as one of them, has the advantages of small size, large output torque, etc. It is widely used. In order to meet the needs of industrial production, this paper studies the opening control characteristics of pneumatic butterfly valve. In order to study the opening control characteristics of the pneumatic butterfly valve, this paper studies the structure and working principle of the pneumatic butterfly valve for the opening adjustment of the pneumatic butterfly valve, establishes the mathematical model of the opening control of the valve (large torque valve and small torque valve), completes the hardware design and software design of the position control of the electric actuator of the pneumatic butterfly valve, and establishes the experimental platform for the opening control of the pneumatic butterfly valve. In order to verify the rationality of the established mathematical model and the feasibility of the control algorithm, the simulation study of valve opening control based on PID, fuzzy PID and single neuron PID control strategy was completed in MATLAB. The research results show that compared with PID controller, under the action of single neuron PID and fuzzy PID controller, the valve opening control has shorter adjustment time, smaller overshoot The anti-interference ability is stronger. In the experimental test, the opening of the butterfly valve is reflected by the number of pulses the motor rotates, and the opening control characteristics of the pneumatic butterfly valve are reflected by the position closed-loop control characteristics of the motor in the electric actuator. The step response characteristics of the system under the action of the single neuron PID control algorithm and the conventional PID control algorithm are compared. The experimental test results show that under the action of the single neuron PID control, The valve opening control has shorter rise time and smaller overshoot. The test results show that the mathematical model of pneumatic butterfly valve opening control is reasonable and the control algorithm is effective. The research results provide theoretical guidance for the opening control of pneumatic butterfly valves in industrial control, and have certain practical value.
、 If we want to avoid the failure of the pneumatic butterfly valve as much as possible, normal maintenance is very important. We should regularly check the wear of some product sealing surfaces, and also check whether the packing used inside the product has failed. If there is any damage, it should be replaced in time.
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