Swing type quick closing check valve is suitable for nominal pressure PN1.0MPa~42.0MPa, Class 150-2500; Nominal diameter DN15~1200mm, NPS1/2~48; Used on various pipelines with a working temperature of -196~540 ℃ to prevent medium backflow. By selecting different materials (WCB, CF8 (M), CF3 (M), 1Gr5Mo, 15CrMo1V), fast closing check valves can be applied to various media such as water, steam, oil, nitric acid, acetic acid, strong oxidizing media, and urea. Quick closing check valves are mainly used in pipelines such as petroleum, chemical, pharmaceutical, fertilizer, and power. The swing type quick closing check valve adopts an internal rocker arm swing structure, and all the opening and closing parts of the valve are installed inside the valve body, without penetrating the valve body. Except for the sealing gasket and sealing ring used in the middle flange, there is no external leakage point as a whole, which eliminates the possibility of valve leakage. The swing arm and valve disc connection of the rotary check valve adopt a spherical connection structure, which allows the valve disc to have a certain degree of freedom within a 360 degree range and appropriate micro position compensation.