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Model designation: The valve model should generally indicate elements such as the valve type, actuation method, connection style, structural features, seal surface material, valve body material, and nominal pressure. The standardization of valve models facilitates the design, selection, and sales of valves. There are an increasing number of types and materials for valves today, and the coding system for valve models is also becoming more complex. Although our country has unified standards for the designation of valve models, they are increasingly failing to meet the needs of the development of the valve industry. Currently, valve manufacturers generally use a unified numbering method ； Where a unified numbering method cannot be adopted, each manufacturer formulates its own numbering system according to its needs. I. Method for coding valve models: JB308-75 \"Method for Coding Valve Models\" is applicable to gate valves, throttle valves, ball valves, butterfly valves, diaphragm valves, plug valves, stopcocks, check valves, safety valves, pressure relief valves, and steam traps used in industrial pipelines. It includes the coding of valve models and the naming of valves. 1: Valve model designation The valve model consists of 7 units, the meanings of which are as follows (that is, the first unit represents the type code) ； Unit 2 represents the transmission mode code ； By the same logic) For example, taking Q941F-16P as an instance, Q denotes Unit 1 (that is, the valve type is a ball valve) ； 9 represents Unit 2 (i.e., the electric drive method among the transmission methods) ； 4 represents 3 units (i.e., the flange connection in the connection method) ； 1 represents the structural format of a 4-unit valve ； F represents unit 5 (i.e., the polytetrafluoroethylene seal ring in the sealing material) ； 16 represents 6 units (i.e., one of the nominal pressures; in this example, it is 1.6 MPa) ； P represents unit 7 (in this example, the material is stainless steel 1cr18Ni9Ti) ； The model numbering is shown in Table 1. Table 1: Unit 1, Unit 2, Unit 3, Unit 4, Unit 5, Unit 6, Unit 7 – Represent the type code, transmission method code, connection type code, structural form code, valve seat sealing surface or lining material code, nominal pressure code, and valve body material code. 2: Type code (i.e., Unit 1 in Table 1): The type code is represented using Pinyin letters. As shown in Table 2: Table 2: Type Code Type Code Gate Valve Z Diaphragm Valve G Globe Valve J Check Valve and Foot Valve H Plunger Valve U Safety Valve A Throttle Valve L Pressure Reducing Valve Y Ball Valve Q Trap Valve S Butterfly Valve D Plug Valve X 3: Transmission method code (i.e., Unit 2 in Table 1): The transmission method code is represented by Arabic numerals. As shown in Table 3: Table 3: 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 via handwheels, handles, and wrenches, 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 indicated by 6S ； Explosion-proof electric types are denoted by “9B”. 4: Connection type code (i.e., cell 3 in Table 1): As shown in Table 4: Table 4: Connection Type Codes Connection Type Code Internal Thread 1 Clamp Type 7 External Thread 2 Clamp Type 8 Flange Type 4 Collar Type 9 Welding (including butt welding and socket welding) 6 5: Structural type code (i.e., cell 4 in Table 1): The structural type code is represented by Arabic numerals, as shown in Tables 5 to 14: Table 5: Structural types of gate valves Gate Valve Structural Type Code Open Stem Wedge Type Elastic Gate Plate 0 Rigid Single Gate Plate 1 Double Gate Plate 2 Parallel Single Gate Plate 3 Double Gate Plate 4 Closed Stem Wedge Type Single Gate Plate 5 Double Gate Plate 6 Table 6: Structural types of globe valves and throttle valves Globe Valve and Throttle Valve Structural Type Code Straight Through Type 1 Angle Type 4 Straight Flow Type 5 Balanced Right-Angle Type 6 Universal Type 7 Table 7: Structural types of ball valves Ball Valve Structural Type Code Floating Straight Through Type 1 L-Type Triangular Type 4 T-Type Fixed Straight Through Type 7 Table 8: Structural types of butterfly valves Table 9: Structural types of diaphragm valves Diaphragm Valve Structural Type Code Ridge Type 1 Shut-Off Type 3 Gate Plate Type 7 Butterfly Valve Structural Type Code Lever Type 0 Vertical Plate Type 1 Inclined Plate Type 3 Table 10: Structural types of plug valves Plug Valve Structural Type Code Packing Straight Through Type 3 T-Type Three-Way Type 4 Four-Way Type Oil Seal Straight Through Type 7 T-Type Three-Way Type 8 Table 11: Structural types of check valves and foot valves Check Valve and Foot Valve Structural Type Code Lift Type Straight Through Type 1 Lift-Up Type 2 Swing Type Single Disc Type 4 Multi-Disc Type 5 Double Disc Type 6 Table 12: Structural types of safety valves Safety Valve Structural Type Code Spring-Actuated Closed with Radiator Full Open Type 0 Slightly Open Type 1 Full Open Type 2 With Wrench Full Open Type 4 Unsealed Dual-Spring Slightly Open Type 3 Slightly Open Type 7 Full Open Type 8 Slightly Open Type 5 With Control Mechanism Full Open Type 6 Pulse Type 9 Table 13: Structural types of pressure relief valves Table 14: Structural types of steam traps Steam Trap Structural Type Code Float Type 1 Bell Float Type 5 Bimetallic Sheet Type 7 Pulse Type 8 Thermodynamic Type 9 Pressure Relief Valve Structural Type Code Diaphragm Type 1 Spring Diaphragm Type 2 Piston Type 3 Bellows Type 4 Lever Type 5 6: Code for valve seat sealing surface or lining material (i.e., cell 5 in Table 1): The code for the valve seat sealing surface or lining material is represented by Chinese Pinyin letters, as shown in Table 15: Table 15: Codes for Valve Seat Sealing Surface or Lining Material Valve Seat Sealing Surface or Lining Material Code Copper Alloy T Cemented Carbide Y Rubber X Lined Rubber J Nylon Plastic N Lined with Lead Q Fluoroplastic F Enamel Coated C Tin-Bismuth Bearing Alloy (Babbitt) B Boronized Steel P Alloy Steel H Graphite SM Nitrided Steel D Note: Materials for the sealing surface directly processed from the valve body are denoted by “W” ； When the materials of the sealing surfaces of the valve seat and the valve disc (gate) are different, use the code for the lower hardness material (except for diaphragm valves). 7: Nominal pressure code (i.e., cell 6 in Table 1): The nominal pressure code is expressed in Arabic numerals, and its value is 10 times the nominal pressure value in megapascals (MPa). For valves used in the power plant industry, when the maximum temperature of the medium exceeds 530°C, this value is 10 times the operating pressure in megapascals (MPa). 8: Valve body material code (i.e., cell 7 in Table 1): The valve body material code is represented using Pinyin letters, as shown in Table 16. This code is omitted for cast iron valves with a PN of less than 1.6 MPa and for carbon steel valves with a PN of more than 2.5 MPa. Table 16: Valve body material codes: Valve body material code – Gray cast iron: Z; 1Cr5Mo, ZG1Cr5Mo: I; Malleable cast iron: K; 1Cr18Ni9Ti, ZG1Cr18Ni9Ti: P; Ductile cast iron: Q; 1Cr18Ni12Mo2Ti, ZG1Cr18Ni12MoTi: R; Copper and copper alloys: T; 12CrMoV: V; Carbon steel: C; ZG12CrMoV: V