Operating principle of electropneumatic ball valve The electropneumatic ball valve is mainly composed of an electric actuator and a pneumatic ball valve. The plug body is a ball with a 90 degree rotation. The electro pneumatic ball valve is not only a good product for throttling, cut-off, cut-off, on-off and flow conversion, but also the first choice in the flow regulation system. It has the characteristics of pressure resistance, temperature resistance, corrosion resistance, small flow resistance, long service life, wide application range, etc. Working principle: electro pneumatic ball valve is mainly operated by regulating the electric flow in the electric actuator. The input and output signals of the electric actuator are 4-20mA and 220VAC power supply standard signals. The motor unit drives the angular torque of the gear worm to control the opening and closing of the pneumatic ball valve, distribute and change the flow direction of the medium, or adjust the proportional degree of the valve core rotation (that is, the valve opening is proportional to the control fluid, or the percentage). Application of electropneumatic ball valve: electropneumatic ball valve does not need manual operation, but intelligent operation. In the production process, the environmental site determines all factors. The electro pneumatic ball valves used in high-pressure, high-temperature or low-pressure, low-temperature environments are different. The following points should be noted:
1. In the case of high pressure and high temperature, high temperature and high pressure resistant materials should be selected as the materials of electro pneumatic ball valves, such as stainless steel and alloy, which can withstand high pressure and high temperature.
2. For low temperature and low pressure, the material does not need to be adjusted too much.
3. The internal parts of the electro pneumatic ball valve need to be replaced to reduce the damage to the valve core, which is also conducive to the flow of media and avoid coking and blockage of the electro pneumatic ball valve.
4. When the electro pneumatic ball valve is opened, some machinery that can avoid vibration can be installed to prevent damage to the internal structure of the electro pneumatic ball valve core when it is opened.

Electromagnetic flowmeter consists of flow sensor and transmitter. The upper and lower parts of the sensor measuring tube are equipped with excitation coils. After the excitation current is applied, a magnetic field is generated and passes through the measuring tube. A pair of electrodes are installed on the inner wall of the measuring tube to contact the liquid, leading out the induced potential and sending it to the transmitter. The excitation current is provided by the transmitter. According to the assembly mode of converter and sensor, there are two types: separated type and integrated type. In the sewage treatment process, the large diameter flowmeter is mostly split type, one part is installed underground, and the other part is installed on the ground. The small caliber is mostly integrated.