Structural forms of commonly used ball valves

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Ball valves are classified into internal thread end ball valves, socket weld end ball valves, integral ball valves, split ball valves, three-piece ball valves, integral side-mounted ball valves, integral top-mounted ball valves, fixed-ball ball valves, one-piece ball valves, two-piece ball valves, ball valves with insulation jackets, metal-sealed top-mounted pneumatic ball valves, oil-sealed fixed ball valves, ball valves with sliding seat and floating design, fixed ball valves with front seat sealing, fixed ball valves with rear seat sealing, three-piece fixed-ball line ball valves, fully welded fixed line ball valves, fully welded floating ball valves, screw rod lift-type ball valves, and track ball valves. Internal thread end ball valve, socket weld end ball valve, integral ball valve, split ball valve 1: Flow path: non-reduced diameter or reduced diameter; Ball support method: floating (seat-supported); Anti-ejection stem structure; Anti-static or fire-resistant structure available if required; Connection ends: internal threads, socket welding, butt welding (extended housing). Standards: BS 5351-1986, ISO 7121-1986, GB/T 12237-1989, MSS-SP-72-1992, JPI-7S-48-1999, BS 5159-1982. Clamp-type ball valve, three-piece ball valve – clamp type; the rest are the same as item 1. Two-piece split ball valve, integral side-mounted ball valve 1: Flow path: full diameter or reduced diameter; Ball support method: floating (seat-supported) or fixed (shaft-supported); Anti-ejection stem structure; Anti-static or fire-resistant structure available if required; Connection ends: flanges. Side-mounted ball valve, integral top-mounted ball valve 1: Flow path: full diameter or reduced diameter; Ball support method: floating (seat-supported) or fixed (shaft-supported); Anti-ejection stem structure; Sliding seat or sealed ball body; Anti-static or fire-resistant structure available if required. Standard: GB/T 12237-1989. Fixed ball valve 1: Flow path: full diameter; Ball support method: fixed (shaft-supported); Connection between housing and upper cover: flanges; Connection ends: flanges (RF, RTJ), butt welding; Anti-static and fire-resistant structures. Standard: API 6D-2002. One-piece ball valve 1: Flow path: straight through, reduced diameter; Housing made of forged steel or cast steel; Valve seat compressed by internal threads; Anti-ejection stem structure; Threaded connection. Standard: GB/T 12237-1989. Two-piece ball valve 1: Flow path: full diameter or reduced diameter; Left and right housings made of forged steel or cast steel; Valve seat compressed by internal threads; Anti-ejection stem structure; Threaded connection. Standard: GB/T 12237-1989. Ball valve with insulation jacket 1: Flow path: full diameter or reduced diameter; Housing made of forged steel or cast steel; Floating ball with PTFE valve seat; Stem seal achieved using packing, with packing sleeves and plates to ensure a tight seal; Flange structure; Insulation jacket provided on the housing part. Metal-sealed top-mounted pneumatic valve 1: Flow path: full diameter or reduced diameter; Housing and upper cover made of chrome-molybdenum steel; Middle flange structure: connected by bolts; Middle flange seal: using sealing rings, metal valve seat; Sealing surfaces are welded from cemented carbide; Flange structure. Standard: API 6D-2002, GB/T 12237-1989, API 608-1995. Oil-sealed fixed ball valve 1: Flow path: full diameter; Left and right housings and ball body made of cast steel or forged steel; Left and right housings sealed using O-rings; Left and right housings connected by bolts; Oil injection ports provided at both valve seat seal locations; Stem connected to ball body using keys; Connection to pipeline via welding or flange structure; Sealing rings made of PTFE. Standard: API 6D-2002, GB/T 12237-1989, API 608-1995. Sliding seat floating ball valve 1: Flow path: full diameter or reduced diameter; Left and right housings made of forged steel or cast steel; Left and right housings connected by bolts, with gaskets for sealing; Both housing sides at the seal locations have 5° slopes, allowing the valve seat seal to slide freely on these slopes; Stem sealed using packing; Adjustment screw at the bottom of the housing also sealed using packing; Connection method: flange structure. Standard: GB/T 12237-1989, API 608-1995. Fixed ball valve with front seat seal 1: Flow path: full diameter; Housing, upper cover, and ball body made of cast steel or forged steel; Top-mounted ball valve housing used; Upper cover of housing connected by bolts; Floating valve seat used, sealing surface made of PTFE; Spring provided behind the valve seat; Front seat shoulder is precisely calculated to ensure the proper sealing pressure at the inlet valve seat; Connection type: flange structure, welding. Standard: API 6D-2002, GB/T 12237-1989, API 608-1995