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What are the specific requirements for installing a swing check valve? What are its applicable media? Next, let’s take a detailed look together. The swing check valve is a type of check valve; its purpose is to prevent backflow in one direction. It is generally used at the outlet of pumps and other important equipment to stop the medium from flowing backward and damaging the equipment behind it. The disc of a swing check valve rotates around an axis; its fluid resistance is generally lower than that of a lift check valve. It is suitable for applications with larger diameters, and its installation location is not restricted – it is usually installed in horizontal pipelines. It is appropriate for use in situations involving large diameters. Based on the number of valve discs, they can be divided into three types: single-disc swing type, double-disc swing type, and multi-disc swing type. Single-disc swing check valves are generally used in applications with medium pipe diameters. When a single-disc swing check valve is used for large-diameter pipelines, in order to reduce water hammer pressure, it is advisable to employ a check valve with a slow-closing mechanism that can minimize such pressure. Double-disc swing check valves are suitable for large and medium-sized pipelines. The wafer-type double-disc swing check valve is compact and lightweight, and it is a type of check valve with fast operation ； Multi-disc swing check valves are suitable for large-diameter pipelines. Applications and features of swing check valves Swing check valves are suitable for nominal pressures ranging from PN1.0MPa to 42.0MPa, and Class150-2500 ； Nominal diameter DN15~1200mm, NPS1/2~48 ； Used in various pipelines operating at temperatures ranging from -196 to 540°C to prevent backflow of the medium. By selecting different materials, it can be used with various media such as water, steam, oils, nitric acid, acetic acid, strongly oxidizing agents, and urea.