①Electric butterfly valve is a saving device, which bel […]
①Electric butterfly valve is a saving device, which belongs to the moving parts. Compared with the detection element, transmitter and controller, during the control process, the electric butterfly valve needs to continuously change the flow area of the saving part, and the manipulated variable is changed to adapt to the load change or operation. Condition changes. Therefore, higher requirements are placed on the sealing, pressure resistance and corrosion of the electric butterfly valve assembly. For example, the sealing will increase the friction force of the electric butterfly valve, increase the dead zone of the electric butterfly valve, and make the control system control quality worse.
② The moving parts of the electric butterfly valve are the main reasons for "running", "risking", "dropping" and "leakage". It not only constitutes a waste of resources or materials, but also pollutes the environment and causes trouble.
③ The internal parts of the electric butterfly valve directly touch the process medium, and the difference between the detection element and the process medium is as follows:
A. The contact medium of the electric butterfly valve valve assembly may be different from the contact medium of the detection element, which has higher requirements on the corrosion resistance, strength, rigidity, materials, etc. of the electric butterfly valve.
B. The detection element can be isolated from the process medium by using isolation liquid and other methods, but the electric butterfly valve generally directly touches the process medium, and it is difficult to select the isolation method from the process medium.
④The saving of electric butterfly valve causes energy to be consumed inside the valve trim. Therefore, it is necessary to choose and coordinate between reducing energy consumption, reducing the pressure loss of the electric butterfly valve, and ensuring better control quality.