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Valve model: The valve model should usually indicate the valve type, driving method, connection form, structural characteristics, nominal pressure, sealing surface material, valve body material and other factors. The standardization of valve models provides convenience for the design, selection and distribution of valves. Today, there are more and more types and materials of valves, and the preparation of valve models is becoming more and more complex. Although our country has a unified standard for valve model compilation, it is gradually unable to meet the needs of the development of the valve industry. At present, valve manufacturers generally use a unified numbering method ； If a unified numbering method cannot be adopted, each manufacturer can develop a numbering method according to its own situation. One unit, two units, three units, four units, five units - six units, seven units, valve type, transmission method, connection type, structural form, sealing material - nominal pressure valve body material □□□□□-□□ one unit: Valve type code type safety valve butterfly valve diaphragm valve check valve bottom valve stop valve throttle valve blowdown valve ball valve trap valve plunger valve plug valve pressure reducing valve gate valve code ADGHJLPQSUXYZ Unit 2: Transmission mode Transmission mode Electromagnetic-hydraulic Electric-hydraulic Worm gear Spur gear Bevel gear Pneumatic Hydraulic Pneumatic-Hydraulic Electric handle Handwheel Code 0 1 2 3 4 5 6 7 8 9 No code three unit: Connection type, connection method, internal thread and external thread, two different connection flanges, welded clamps, clamp sleeve code 1 2 3 4 6 7 8 9 four units: Structural type The structural type of each valve is different. Please click on the corresponding valve structure type preparation method below. Gate valve structural form code: rising stem wedge elastic gate 0 rigid single gate 1 double gate 2 parallel single gate 3 double gate 4 concealed stem wedge single gate 5 double gate 6 parallel single gate 7 double gate 8 safety valve structural form code spring closed with radiator full opening 0 micro opening 1 full opening 2 Full lift type with wrench 4 Non-closed double spring micro lift type 3 Micro lift type 7 Full lift type 8 Full lift type with control mechanism 6 Pulse type 9 Lever type 5 Pressure reducing valve structural form code direct acting bellows type 1 direct acting diaphragm type 2 pilot piston type 3 pilot bellows type 4 pilot diaphragm type 5 five units: Seal deputy material Tin-based bearing alloy (Babbitt alloy) Enameled nitrided steel 18-8 series stainless steel fluoroplastic glass Cr13 Stainless steel lined Monel alloy Nylon plastic boronized steel lead lined Mo2Ti Stainless steel plastic copper alloy rubber hard alloy valve body direct processing code BCDEFGHJMNPQRSTXYW When the sealing surface materials of the sealing pair are different, the material code with lower hardness is used. unit six: The nominal pressure value is directly expressed in Arabic numerals, which is 10 times MPa. Seven units: Valve body material Valve body material Titanium and titanium alloy carbon steel Cr13 series stainless steel chromium molybdenum steel malleable cast iron aluminum alloy 18-8 series stainless steel ductile iron Mo2Ti series stainless steel plastic copper and copper alloy chromium molybdenum vanadium steel gray cast iron code ACHIKLPQRSTVZ gray cast iron bottom pressure valve and steel medium pressure omit this example: Z543H-16C bevel gear transmission flange connected flat gate valve, nominal pressure 1.6MPa, valve body material is carbon steel valve naming The valve is named according to the transmission mode, connection form, structural form, lining material and type. However, the following contents are omitted in the naming: (1) In connection form: “Flange". (2) In structural form: a: Gate valve's "rising stem", "elasticity", "rigidity" and "single gate"” ； b: "Straight-through" type of globe valve and throttle valve” ； c: "Floating" and "Straight-through" ball valves” ； d: Butterfly valve "vertical plate type"” ； e: Diaphragm valve "roof type"” ； f: Plug valve "packing" and "straight-through"” ； g: "Straight-through" and "Single-disc" check valves” ； h: The safety valve is "not closed". (3) Material name among valve seat sealing surface materials