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For those purchasing ball valve products for the first time or who lack knowledge about valves, it is advisable to understand this method of specification. It provides guidance on making the right selection and on purchasing valve products. This specification method combines international coding standards with internal technical considerations to ensure accurate representation. It explains the additional codes for ball valves, the valve codes themselves, the driving methods, connection types, structural designs, sealing materials, pressure ratings, and valve body materials. It is hoped that this will be useful to all users. Explanation of the coding method for ball valve models: Additional codes for ball valves: V indicates a valve core with a V-shaped structure; D denotes low-temperature use; B refers to insulation features; P indicates an eccentric structure; U, S, and DY generally indicate an overhead-mounted design. Code for the type of ball valve: Q denotes a ball valve. Codes for the driving mechanism of the ball valve: 2 indicates electro-hydraulic operation, 3 indicates turbine drive, 6 indicates pneumatic operation, 7 indicates hydraulic operation, 9 indicates electric operation; there is no code for manual operation. Codes for the connection method: 1 indicates internal threading, 4 indicates flange connection, 6 indicates welding, 7 indicates clamp-type connection. Codes for the structural type: Floating type: 1 indicates straight-through flow, 2 indicates Y-type tee, 4 indicates L-type tee, 5 indicates T-type tee; Fixed type: 0 indicates hemispherical straight-through design, 6 indicates four-way flow path, 7 indicates straight-through flow, 8 indicates L-type tee, 9 indicates Y-type tee. Codes for the sealing material: B denotes babbitt alloy, F denotes fluororubber, F46 denotes fluorinated lining, H denotes stainless steel, J denotes rubber lining, M denotes Monel alloy, N denotes nylon plastic, Monel P, Y denotes cemented carbide, W denotes a valve body that is machined directly. Codes for pressure ratings: 16 indicates a pressure of 16 kilograms (1.6 MPa), with a maximum pressure of up to 64 MPa; 150LB denotes pressure based on American standards, with a maximum pressure rating of 2500 LB (150LB = 1.6 MPa/300LB = 2.5–4.0 MPa/400LB = 6.4 MPa/600LB = 10 MPa); 5K denotes Japanese standard pressure, with a maximum pressure of 63 K. Code for the valve body material: A denotes titanium and titanium alloys, C denotes carbon steel, I denotes chromium-molybdenum steel, P18-8 series stainless steel, RMo2Ti series stainless steel, S denotes plastic. Examples of ball valve specifications: 1. DQ41H-16P means: D for low temperature, Q for ball valve, 4 for flange connection, 1 for floating straight-through flow path, H for stainless steel, 16 for a pressure of 16 kilograms, and P for a valve body made of 18-8 grade stainless steel; 2. Q645F-25C means: Q for ball valve, 6 for pneumatic drive, 4 for flange type, 5 for T-type three-way flow path, F for fluoroplastic material, 25 for a pressure of 25 kilograms, and C for cast steel. Common types of ball valves include: V-type ball valves: VQ40F, VQ640F, VQ940F, VQ641H, VQ941H, VQ70F, VQ670F, VQ970F, VQ71H, VQ671H, VQ971H; insulated ball valves: BQ41F, BQ641F, BQ941F; stainless steel ball valves: Q41F, Q641F, Q941F, Q41H, Q641H, Q941H; fluorine-lined ball valves: Q41F46, Q641F46, Q941F46; low-temperature ball valves: DQ41F, DQ41H, DQ41Y; wafer-type ball valves: Q71F, Q671F, Q971F, Q71H, Q671H, Q971H; high-temperature ball valves: Q41M, Q641M, Q941M, Q41PPL, Q641PPL, Q941PPL; fixed ball valves: Q347F, Q647F, Q947F, Q347H, Q647H, Q947H, Q347W, Q647W, Q947W; turbine ball valves: Q341F, Q341H, Q341W, Q341Y; welded ball valves: Q61F, Q361F, Q61H, Q661F, Q661H, Q961F, Q961H; eccentric half-ball valves: Q340F, Q640F, Q940F, Q340H, Q640H, Q940H, Q340Y, Q640Y, Q940Y; top-mounted ball valves: SQ340F, SQ940F, SQ340H, SQ940H, SQ347H, SQ647H, SQ947H, DYQ340F, DYQ640F, DYQ940F; three-way ball valves: Q44F, Q45F, Q44H, Q45H, Q644F, Q645F, Q644H, Q645H, Q944F, Q945F, Q944H, Q945H; four-way ball valves: Q46F, Q46H, Q646F, Q646H, Q946F, Q946H.