H77 type clamp check valve is composed of valve body, disc, stem and spring and other parts, and adopts clamp connection. Due to the short closing stroke of the disc and the spring-loaded movement, water hammer is significantly reduced. This check valve is mainly suitable for water supply and drainage pipe networks of urban, industrial and high-rise buildings. Because its structural length is shorter than that of general check valves, it is most suitable for places with installation space restrictions. Clamp-on check valves are used in pure pipelines and industrial, environmental protection, water treatment, high-rise building water supply and drainage pipelines to prevent the reverse flow of media.