Nodular Cast Iron Clamping Valve is a common connection pipe fittings, widely used in various pipeline systems, its main role is used for pipeline or pipeline interface leakage repair. The structure of the Haf joint is mainly composed of two symmetrical Haf body, Haf pressure, sealing ring, sealing strip, fasteners, and is fastened by bolts and nuts. This design makes the Haf joint easy to install and can quickly and effectively solve the problem of pipeline leakage