As a rotary opening and closing valve, the core working logic of the quick installation butterfly valve revolves around the rotation of the butterfly plate driven by the valve stem to achieve the on/off and flow regulation of the pipeline medium. The valve body is equipped with a circular butterfly plate as the core opening and closing component. The center of the butterfly plate is fixedly connected to the valve stem that runs through the valve body, and the other end of the valve stem is matched with a handle, pneumatic or electric drive device. When working, the valve stem is controlled by the driving device to drive the butterfly plate to rotate from 0 ° to 90 °: when the butterfly plate rotates parallel to the flow direction of the pipeline medium (the valve stem rotates 90 °), the valve is fully open, and the medium can pass through the pipeline with a large flow cross-sectional area and minimal fluid resistance; When the butterfly plate rotates perpendicular to the flow direction of the medium (the valve stem rotates 0 ° to reset), the edge of the butterfly plate will tightly adhere to the sealing surface of the valve body, cutting off the medium flow channel and achieving reliable sealing and flow interruption; If the butterfly plate is rotated to any angle between 0 ° and 90 °, the flow rate and velocity of the medium inside the pipeline can be accurately adjusted by changing the cross-sectional area of the butterfly plate blocking the pipeline. At the same time, the sanitary grade clamp quick installation connection structure adopted by it does not directly participate in the opening and closing core action, but can quickly complete the assembly and disassembly with the pipeline, ensuring the cleanliness and maintenance convenience of the overall pipeline system, and adapting to the operational needs of various sanitary grade fluid transportation scenarios.