Multifunctional butterfly valve

The utility model relates to a multifunctional butterfly valve which comprises a butterfly plate. The other side face of a butterfly plate body is a hemispheric arc face. A plurality of hollow cavities are formed in the position, between an upper connecting portion and a lower connecting portion, in the butterfly plate body, the butterfly valve is provided with an outer bolt and nut, an inner bolt and nut and an adjusting bolt and nut, a valve body is made of spheroidal graphite cast iron, and a stainless steel layer is arranged on the sealing face of the valve body in a surfacing mode. Due to the fact that the hemispheric arc face of the butterfly valve is arranged, the choke flow of the valve plate is greatly reduced, the hemispheric arc face is not prone to generating the vortex, supporting force is greatly enhanced, and the service life of the valve plate is prolonged. Due to the hollow cavities, the weight of the valve plate can be reduced. Due to the outer bolt and nut, the inner bolt and nut and the adjusting bolt and nut, the height of the butterfly plate can be vertically adjusted according to actual conditions, and use in different occasions is met. Due to the fact that the valve body is made of the spheroidal graphite cast iron, and stainless steel is arranged on the sealing face zone of the valve body in the surfacing mode, the service life of the butterfly valve is prolonged.