Ceramic throttling cutoff valve

The utility model mainly adopts a ceramic valve seat and a ceramic valve core. The ceramic valve core is composed of a streamline throttling cone, a ceramic sealing ring, a soft sealing ring and an elastic rubber ring. The streamline throttling cone is used for regulating the area of a flow passage, achieving the purpose of regulating the flow. The valve core adopts soft and hard double sealing to improve the sealing performance, and zero leakage can be realized. The extension plane of the streamline throttling cone contains a valve core soft sealing surface, and the media flow in a sloping direction along the conical surface, which can avoid directly flushing the valve core sealing surface. Due to the adoption of the special ceramic sealing material, the service life of the valve can be prolonged numeral times.