HH47, H47XF, HDH47X butterfly buffer check valves produced by Huadian Pump Valve Company are mainly used at the outlet of pumps in industrial water supply and sewage treatment plants to prevent the reverse flow of media in the pipe network. Automatic elimination of damaging water hammer ensures that pumps and lines are not damaged. The valve is mainly composed of valve body, disc, buffer device and micro control valve. The product has the characteristics of novel structure, small size, small fluid resistance, stable operation, reliable density, wear resistance, good cushioning performance, etc., and is the best product for industrial water and urban sewage.