The hard-sealed butterfly valve has an eccentric metal sealing structure. The sealing form is metal-to-metal sealing, exchangeable metal sealing ring-to-metal sealing, stainless steel plate and graphite composite plate sealing ring-to-metal sealing. In addition to electric driving, the hard-sealing butterfly valve has other drive modes. : Manual, worm gear transmission, pneumatic, etc. This type of valve should generally be installed horizontally in pipelines.

The butterfly plate of the hard seal butterfly valve is installed in the diameter direction of the pipe. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is fully open.