The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline, and the butterfly plate is driven by the valve rod. In the cylindrical channel of the butterfly valve body, the disc shaped butterfly plate rotates around the axis with a rotation angle of 0 ° - 90 °. When it rotates to 90 °, the valve is fully open. The flow of medium can be controlled by changing the deflection angle of the butterfly plate.

The measuring tube is in the magnetic field, and the fluid passes through the center of the sensor. It must be able to bear the working pressure of the fluid medium and the electrostatic shielding effect of the excitation coil on the measuring electrode. Therefore, the material of the measuring tube must be non magnetic, with high resistivity, low thermal conductivity and certain mechanical strength. Generally, stainless steel, glass fiber reinforced plastic Aluminum and other high-strength materials. The measuring pipe here is made of stainless steel