The TIANYU Swing Check Valve is a bolted bonnet swing-type non-return valve fully engineered in accordance with internationally recognized industrial valve standards including API 594, ASME B16.34, ASME B16.5, ASME B16.10, and EU CE safety certification, delivering reliable one-way flow isolation and medium backflow prevention for general industrial, petrochemical, power and municipal piping systems. This valve adopts classic swing disc internal structure, with the disc hinged on an internal pivot shaft to freely swing open under forward medium flow pressure and tightly attach to valve seat to cut off reverse fluid flow once pipeline pressure reverses. The product is equipped with standard raised face flanged end connections and bolted top cover sealed by flexible graphite composite gasket, without auxiliary spring components, which greatly reduces fluid flow resistance during normal pipeline operation. All dimensional indexes follow unified ASME dimensional specifications to realize full interchangeability with global standard pipeline flanges, which simplifies on-site installation, regular maintenance and spare parts replacement for EPC contractors and plant operation departments. All finished products pass API 598 standardized hydrostatic and air tightness testing before delivery, satisfying market access audit requirements for North America, European Union, Middle East and Southeast Asia industrial engineering projects.
The ASTM A216 WCB cast carbon steel valve body is processed through standardized normalizing heat treatment, with minimum tensile strength reaching 485MPa and minimum yield strength hitting 240MPa, possessing excellent impact resistance and structural stability under alternating temperature and pressure working conditions, widely compatible with steam, industrial water, crude oil, natural gas and most neutral non-corrosive industrial fluids. The internal swing disc is hardfaced with 13Cr alloy on the sealing contact surface after precision machining and lapping, forming rigid metal-to-metal sealing pair with valve body seat, which maintains stable tight shut-off performance under high temperature medium erosion without aging deformation like soft rubber sealing materials. The pivot shaft adopts quenched and tempered F6a stainless steel raw material, effectively resisting medium corrosion and galling abrasion during long-term reciprocating swing movement, avoiding disc jamming failure caused by shaft rusting. The bolted top cover is matched with flexible graphite spiral wound gasket as static sealing component, the layered graphite composite structure retains stable sealing performance under high temperature fluctuation, effectively blocking medium leakage at the body-cover joint. The flanged raised face connection surface is machined with serrated anti-slip texture, which increases gasket attaching friction and prevents medium seepage under pipeline pressure fluctuation. The valve body internal flow channel adopts streamlined casting design to reduce medium turbulence and pressure loss during forward circulation, which optimizes overall pipeline transmission efficiency compared with lift-type check valve products with narrow flow passage.
