Low-shear butterfly valve

The utility model relates to the technical field of valve switches. The butterfly valve is a low-shear butterfly valve. The valve comprises a valve body, an upper sleeve, a lower sleeve, a switch rotary rod and a valve element assembly. A front-back through mounting hole is formed in the front part of the valve body; an upper sleeve is fixedly installed in the middle of the upper end of the valvebody and provided with an upper working cavity penetrating up and down, the valve body is provided with an upper connecting hole enabling the upper working cavity to be communicated with the installation hole, and a lower sleeve is fixedly installed in the middle of the lower end of the valve body corresponding to the upper sleeve and provided with a lower working cavity penetrating up and down. The device is reasonable and compact in structure; ingenuous concept, the front side of the front valve plate and the rear side of the rear valve plate are flat and smooth under the principle of not influencing the strength of