Summary of the meanings of valve identification models

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Valve model coding method, valve numbering instructions, valve naming. A valve model should typically indicate elements such as the valve type, actuation method, connection style, structural features, nominal pressure, seal surface material, and valve body material. The standardization of valve models facilitates the design, selection, and distribution of valves. Today, there are an increasing number of types and materials for valves, and the designation of valve models has become increasingly complex. Although our country has unified standards for the designation of valve models, they are gradually failing to meet the needs of the development of the valve industry. Currently, valve manufacturers generally use a unified numbering system ； Where a unified numbering method cannot be adopted, each manufacturer may develop its own numbering system based on its specific circumstances. Unit 1: Valve type codes. Types include safety valves, butterfly valves, diaphragm valves, check valves, foot valves, gate valves, throttle valves, drain valves, ball valves, air release valves, plug valves, cocks, pressure reducing valves, and gate valves. The codes are A, D, G, H, J, L, P, Q, S, U, X, Y, Z. When a valve has additional functions or a special structure, an additional Chinese pinyin letter is added in front of the valve type code, in accordance with the rules specified in the table below. Code for the name of the second functional feature Code for the name of the second functional feature: Insulating type B, Slag discharge type P, Low-temperature type Da, Fast type Q, Fire-resistant type F (stem sealing), Bellows type W, Slow-closing type H – a. The low-temperature type refers to valves that can be used at temperatures below -46°C. Unit 2: Transmission methods. Transmission methods include electromagnetic drive, electromagnetic-hydraulic drive, electro-hydraulic drive; worm gears, spur gears, bevel gears; pneumatic drive, hydraulic drive, pneumatic-hydraulic drive; electric drive. Handles and handwheels. Codes: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. No code. Valves with safety valves, pressure relief valves, steam traps, or handwheels that are directly connected to the valve stem – this code is omitted as it is not applicable in such cases ； For valves operated by pneumatic or hydraulic actuators: normally open types are denoted by 6K and 7K ； Normally closed is indicated by 6B and 7B ； Valves for explosion-proof electric devices are denoted by 9B. Unit 3: Connection types – Internal threads, external threads, two different types of connection flanges, welding, clamp-type connections, sleeve connections. Codes: 1, 2, 3, 4, 6, 7, 8, 9. Unit 4: Structural types – The structural form of the valve is indicated by Arabic numerals, in accordance with the provisions in the table below. Gate valve structure code Structure code Stem rising type (exposed stem) Wedge gate Flexible gate 0 Rigid gate Single gate 1 Double gate 2 Parallel gate Single gate 3 Double gate 4 Stem non-rising type (hidden stem) Wedge gate Single gate 5 Double gate 6 Parallel gate Single gate 7 Double gate 8 Structure codes for stop valves, throttle valves, and plug valves Structure code Structure code Structure code Unbalanced disc Straight-through flow path 1 Balanced disc Straight-through flow path 6 Z-shaped flow path 2 Angular flow path 7 Three-way flow path 3 —— Angular flow path 4 —— Straight flow path 5 —— Ball valve structure code Structure code Structure code Structure code Floating ball Straight-through flow path 1 Fixed ball Straight-through flow path 7 Y-shaped three-way flow path 2 Four-way flow path 6 L-shaped three-way flow path 4 T-shaped three-way flow path 8 T-shaped three-way flow path 5 L-shaped three-way flow path 9 —— Semi-ball straight-through 0 Butterfly valve structure code Structure code Structure code Structure code Sealed single eccentric 0 Unsealed single eccentric 5 Center vertical plate 1 Center vertical plate 6 Double eccentric 2 Double eccentric 7 Triple eccentric 3 Triple eccentric 8 Linkage mechanism 4 Linkage mechanism 9 Diaphragm valve structure code Structure code Structure code Structure code Ridge flow path 1 Straight-through flow path 6 Straight flow path 5 Y-shaped angular flow path 8 Plug valve structure code Structure code Structure code Structure code Packing seal Straight-through flow path 3 Oil seal Straight-through flow path 7 T-shaped three-way flow path 4 T-shaped three-way flow path 8 Four-way flow path 5 —— Check valve structure code Structure code Structure code Structure code Rising disc Straight-through flow path 1 Swinging disc Single-disc structure 4 Vertical structure 2 Multi-disc structure 5 Angular flow path 3 Double-disc structure 6 —— Butterfly check type 7 Safety valve structure code Structure code Structure code Structure code Spring-loaded spring-sealed structure with fins Fully open 0 Spring-loaded spring-unsealed structure with wrench Slightly open, double valve 3 Slightly open 1 Slightly open 7 Fully open 2 Fully open 8 Fully open with wrench 4 —— Lever type Single lever 2 Fully open with control mechanism 6 Double lever 4 Pulsating type 9 Pressure reducing valve structure code Structure code Structure code Structure code Diaphragm type 1 Bellows type 4 Spring diaphragm type 2 Lever type 5 Plug type 3 —— Steam trap structure code Structure code Structure code Structure code Float ball type 1 Steam pressure or diaphragm box type 6 Float bucket type 3 Bimetallic strip type 7 Liquid or solid expansion type 4 Pulsating type 8 Bell float type 5 Disk thermodynamic type 9 Drain valve structure code Structure code Structure code Structure code Liquid level connection Discharge stop type Straight-through type 1 Bottom-level intermittent discharge stop type Straight flow type 5 Stop type angular 2 Stop type straight-through 6 —— Stop type angular 7 —— Floating gate type straight-through 8 Unit 5: Seal pair material Material Tin-based bearing alloy Babbitt alloy Nitrided steel 18-8 series stainless steel Fluoroplastic Glass Cr13 stainless steel Rubber-lined Monel alloy Nylon plastic Boronized steel Lead-lined Mo2Ti stainless steel Plastic Copper alloy Rubber Hard alloy Valve body Direct machining code BCDEFGHJMNPQRSTXYW When the sealing surface materials of the seal pair differ, the code of the material with lower hardness is used. Unit 6: The nominal pressure value is expressed directly in Arabic numerals; it is 10 times MPa. Unit 7: Valve body material – Titanium and titanium alloys, carbon steel, Cr13 series stainless steel, chromium-molybdenum steel, malleable cast iron, aluminum alloys, 18-8 series stainless steel, ductile iron, Mo2Ti series stainless steel, plastics, copper and copper alloys, chromium-molybdenum-vanadium steel, gray cast iron. Codes: A, C, H, I, K, L, P, Q, R, S, T, V, Z. This field is omitted for gray cast iron low-pressure valves and steel medium-pressure valves. Example: Z543H-16C – A flat gate valve with bevel gear drive and flange connection, with a nominal pressure of 1.6 MPa; the valve body material is carbon steel. Naming of valves: Valves are named based on their drive method, connection type, structural design, lining material, and type. However, the following is omitted in the naming: (1) In the connection type: “flange”. (2) In terms of structural type: a: \"Visible stem\", \"elastic\", \"rigid\" and \"single gate\" for gate valves” ； b: “Straight-through type” for stop valves and throttle valves” ； c: “Floating” and “through-type” of ball valves” ； d: “Vertical plate type” of butterfly valve” ； e: “Ridge-style” for diaphragm valves” ； f: “Sealant” and “through-type” of the plug valve” ； g: “Straight-through” and “single-disc” types of check valves” ； h: “Unsealed” of the safety valve. (3) The name of the material in the valve seat sealing surface. See the table above