Instrument basics

1) Modeling of the valve The valve model is composed of 7 units, the meanings of which are shown in Table 1. Table 1 Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit Type Code Transmission Mode Code Connection Form Code Structural Form Code Valve Seat Sealing Surface or Lining Material Code Nominal Pressure Code Valve Body Material Code 1, Type Code (ie Table 1 1 unit) Type code 1) Model code of the valve The valve model is composed of 7 units, the meanings of which are shown in Table 1. Table 11 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit Type Code Transmission Mode Code Connection Form Code Structural Form Code Valve Seat Sealing Surface or Lining Material Code Nominal Pressure Code Valve Body Material Code 1, Type Code (ie Table 1 Unit 1) The type code is expressed in Chinese 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 Bottom Valve H Plunger Valve U Safety Valve A Throttle Valve L Pressure Reducing Valve Y Ball Valve Q Trap Valve S Butterfly Valve D Cock The code of the valve X2 and the transmission mode (that is, unit 2 in Table 1) is represented by Arabic numerals. As shown in Table 3: Table 3 Transmission Mode Code Transmission Mode Code Electromagnetic 0 Bevel Gear 5 Electromagnetic-Hydraulic 1 Pneumatic 6 Electric-Hydraulic 2 Hydraulic 7 Worm Gear 3 Pneumatic-Hydraulic 8 Spur Gear 4 Electric 9 Note: 1 . This code is omitted for handwheel, handle and wrench drive, as well as safety valve, pressure reducing valve, and steam trap. 2. For pneumatic or hydraulic: normally open type is represented by 6k, 7k; normally closed type is represented by 6B, 7B; pneumatic belt manual is represented by 6S; explosion-proof electric is represented by '9B'. 3. The code of the connection form (ie Unit 3 in Table 1) is shown in Table 4:: Table 4 Code of the connection form Code of the connection form Internal thread 1 pair clamp 7 external thread 2 clamp 8 flange 4 ferrule 9 welding 6-- 4. Structural form code (ie 4 units in Table 1) The structural form code is represented by Arabic numerals, as shown in Tables 5 to 14: Table 5 Gate valve structural form code Open-rod wedge elastic gate 0 Rigid single gate 1 double Gate 2 Parallel single gate 3 Double gate 4 Concealed rod wedge single gate 5 Double gate 6 5. Valve seat sealing surface or lining material code (ie Unit 5 in Table 1) Valve seat sealing surface or lining material The code is expressed in Chinese pinyin letters, as shown in Table 15: Table 15 Valve seat sealing surface or lining material code Valve seat sealing surface or lining material code Copper alloy T hard alloy Y rubber X rubber lining J nylon plastic N lead Q fluorine lining Plastic F Enamel C Tin-gold bearing alloy (Babbitt alloy) B Boronized steel P Alloy steel H Graphite SM nitrided steel D--Note: The sealing surface material is directly processed by the valve body and is represented by 'W'; when the valve seat and disc (Ram) When the sealing surface material is different, use the low-hardness material code (except for diaphragm valves). 6. Nominal pressure code (that is, unit 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). 7. Valve body material code (ie Unit 7 in Table 1) The valve body material code is represented by Chinese pinyin letters, as shown in Table 16, cast iron with PN≤1.6MPa and carbon steel valve with PN≥2.5MPa are omitted this code . Valve body material codeValve body material code gray cast iron Z1Cr5Mo, ZG1Cr5MoI malleable cast iron K1Cr18Ni9Ti, ZG1Cr18Ni9TiP ductile iron Q1Cr18Ni12Mo2Ti, ZG1Cr18Ni12MoTiR copper and copper alloy T12CrMoVV carbon steel CZG12CrMoVV