Valve model designation

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1. The method for coding valve models is as follows: http://www.famens.com/tools/images/ff.jpg 2. The type codes are represented by Pinyin letters, in accordance with the provisions in Table 1. Table 1 Type Code Type Code Gate Valve Z Plug Valve X Globe Valve J Check Valve and Foot Valve H Throttle Valve L Safety Valve A Ball Valve Q Pressure Reducing Valve Y Butterfly Valve D Trap Valve S Diaphragm Valve G Plunger Valve U Note: For valves designed for low temperatures (below -40 degrees Celsius), those with insulation (equipped with a heating layer), and those with bellows, the Chinese pinyin letters “D”, “B”, and “W” are added in front of the type code respectively. 3. The transmission mode code is represented by Arabic numerals in accordance with the provisions of Table 2. Table 2 Transmission Method Code Transmission Method Code Electromechanical 0 Bevel gear 5 Electromagnetic-hydraulic 1 Pneumatic 6 Electro-hydraulic 2 Hydraulic 7 Worm gear 3 Pneumatic-hydraulic 8 Spur gear 4 Electric 9 Note: (1) Codes for transmission by handwheel, handle, and wrench, as well as for safety valves, pressure relief valves, and steam traps, are omitted. (2) For pneumatic or hydraulic types: normally open types are denoted by 6K and 7K ； Normally closed is indicated by 6B and 7B ； Pneumatic with manual operation is denoted by 6S, while explosion-proof electric versions are denoted by “9B”. A worm-T-nut is denoted by 3T. 4. The connection type code is represented by Arabic numerals in accordance with the provisions of Table 3. Table 3 Connection Types Code Connection Types Code Internal Thread 1 Clamp Type 7 External Thread 2 Clamp Ring Type 8 Flange Type 4 Collar Type 9 Welded Type 6 5. The code for the structural type is represented by Arabic numerals, in accordance with the provisions in Tables 4–13. Table 4 Structure Types of Gate Valves Code Open Stem Wedge Type Elastic Gate Plate 0 Rigid Single Gate Plate Double Gate Plate 1 2 Parallel Type Single Gate Plate Double Gate Plate 3 4 Hidden Stem Wedge Type Single Gate Plate Double Gate Plate 5 6 Hidden Stem Parallel Type Double Gate Plate 8 Table 5 Structure Types of Stop Valves and Throttle Valves Code Straight Through Type 1 Angle Type 4 Straight Flow (Y-Type) 5 Balanced Straight Through 6 Angle Type 7 Table 6 Structure Types of Ball Valves Code Floating Straight Through Type 1 L-Type Three-Way Type 4 T-Type 5 Four-Way Type 6 Fixed Straight Through Type 7 Table 7 Structure Types of Butterfly Valves Code Lever Type 0 Vertical Plate Type 1 Inclined Plate Type 3 Table 8 Structure Types of Diaphragm Valves Code Bucket Type 1 Shut-Off Type 3 Gate Plate Type 7 Table 9 Structure Types of Plug Valves Code Packing Straight Through Type 3 T-Type Three-Way Type 4 Four-Way Type 5 Oil Seal Straight Through Type 7 T-Type Three-Way Type 8 Table 10 Structure Types of Check Valves and Footvalves Code Lift Type Straight Through Type 1 Vertical Type 2 Swing Type Single Disc Type 4 Multi-Disc Type 5 Double Disc Type 6 Butterfly Type 7 Table 11 Structure Types of Safety Valves Code Spring Closed With Radiator Full Open Type 0 Slightly Open Type 1 Full Open Type 2 With Wrench Full Open Type 4 Dual Spring Slightly Open Type 3 Unclosed Slightly Open Type 7 Full Open Type 8 With Control Mechanism Slightly Open Type 5 Full Open Type 6 Pulsating Type 9 Table 12 Structure Types of Pressure Reducing Valves Code Diaphragm Type 1 Spring Diaphragm Type 2 Piston Type 3 Bellows Type 4 Lever Type 5 Table 13 Structure Types of Trap Valves Code Float Type 1 Bell Shape Float Type 5 Bimetallic Type 7 Pulsating Type 8 Thermodynamic Type 9 6. The code for the valve seat sealing surface or lining material is represented by Chinese Pinyin letters, in accordance with the provisions in Table 14. Table 14 Codes for seat sealing surface or lining materials. Code for seat sealing surface or lining material: Copper alloy – T; Nitrided steel – D; Rubber – X; Cemented carbide – Y; Nylon plastic – N; Lined rubber – J; Fluoroplastic – F; Lead-lined – Q; Tin-based bearing alloy (Babbitt) – B; Stoneware – C; Alloy steel – H; Boronized steel – P. 7. The nominal pressure values are in accordance with the specifications in JB74-59 \"Nominal pressure, test pressure, and operating pressure for pipeline fittings\". For valves used in power plant industries, when the maximum temperature of the medium exceeds 530 degrees Celsius, the operating pressure is indicated in accordance with Article 5 of JB74-59. 8. The code for the valve body material is represented by Chinese Pinyin letters, in accordance with the provisions of Table 15. Table 15 Valve body material codes. Valve body material code: Gray cast iron – Z; Cr5MoI; Malleable cast iron – K; 1Cr18Ni9Ti – P; Ductile cast iron – Q; Cr18Ni12Mo2Ti – R; Copper and copper alloys – T; 12CrMoV – V; WCB – C. Note: This code is omitted for gray cast iron valve bodies with PN≤1.6 MPa and for carbon steel valve bodies with PN≥2.5 MPa. Example 1: Pneumatic, normally open type, flanged connection, ridge design, lined with rubber; nominal pressure PN0.6MPa; valve body made of gray cast iron – Diaphragm valve: G6k41J-6 Pneumatic normally open rubber-lined diaphragm valve. Example 2: Hydraulic operation, flanged connection, vertical plate design; valve seat sealing surface made of cast copper, valve disc sealing surface made of rubber; nominal pressure PN0.25MPa; valve body made of gray cast iron – Butterfly valve: D741X-2.5 Hydraulic butterfly valve. Example 3: Motor-driven, welded connection, straight-through design; valve seat sealing surface made of cemented carbide; operating pressure at 540°C is 17MPa; valve body made of chromium-molybdenum-vanadium steel – Globe valve: J961Y-P54170 Electric welded globe valve