2. The common polymer materials cannot bear high temperature (below 350 ° C), but rigid high-purity graphite can bear high temperature below 900 ° C. Therefore, under high temperature load, whether the packing seal is dynamic sealing or not, rigid high-purity graphite or polymer materials are usually selected, but it should be noted that the friction resistance will be too large.

The butterfly plate of the electric butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the electric 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.