What is the valve? Valve is now defined as such, the valve is the fluid conveying system control components, with diversion, interception, regulation, throttling, to prevent backflow, shunt or overflow pressure relief and other functions. Valve as an important control of the pipeline components, widely used in petroleum, chemical, metallurgical, natural gas transmission, power stations, urban water supply and other national economy in various departments. Below, we further introduce the knowledge of the valve. 1. DN (nominal size) The following nominal size DN value according to GB / T 1047-2004 standards. DN: Dimensioning of alphanumeric combinations of piping system components. It consists of the letter DN followed by a dimensionless integer number. This figure is directly related to feature sizes such as the bore or outside diameter (in mm) of the end fitting. Note: Except as otherwise provided in the relevant standard, the number following the letter DN does not represent the measured value and can not be used for calculation purposes. Those standards that use the DN marking system should give the relationship between the DN and the dimensions of the pipe elements, such as DN / OD or DN / ID. The preferred DN values ​​are as follows: DN6 DN100 DN700 DN2200 DN8 DN125 DN800 DN2400 DN10 DN150 DN900 DN2600 DN15 DN200 DN1000 DN2800 DN20 DN250 DN1100 DN3000 DN25 DN300 DN1200 DN3200 DN32 DN350 DN1400 DN3400 DN40 DN400 DN1500 DN3600 DN50 DN450 DN1600 DN3800 DN65 DN500 DN1800 DN4000 DN80 DN600 DN2000 2. PN (nominal pressure) below the nominal pressure PN value according to GB / T 1048-2004 standard. PN: Identification of the combination of letters and numbers for reference to the mechanical properties and dimensional characteristics of piping system components. It consists of the letter PN followed by a dimensionless number. Note: The numbers following the letter PN do not represent measured values ​​and should not be used for calculation purposes unless otherwise specified in the relevant standard. The term PN has no meaning except in connection with the relevant pipe standard. The allowable pressure of piping components depends on the PN values ​​of the components, material and design, and allowable operating temperature, etc. The allowable pressures are given in the corresponding standard pressure-temperature registries. All pipe elements with the same values ​​for PN and DN shall have the same mating dimensions as the mating flanges. PN values ​​should be selected from the following family: PN DIN Series ANSI Series PN2.5 PN20 PN6 PN50 PN10 PN110 PN16 PN150 PN25 PN260 PN40 PN420 PN63 PN100 Note: Other PN values ​​may be allowed if desired. 3. Valve Model Preparation Valve model is mainly based on the preparation of JB / T 308-2004 standard. (1) Model preparation method: Model preparation method â… â…¡ â…¢ â…£ â…¤ - â…¥ â…§ â… : Type code â…¡: Driving method code â…¢: Connection code â…£: Structure code â…¤: Seal material or lining code â…¥: Pressure code Or working pressure â…¦: Valve body code (2) The valve type code is in pinyin, according to "Table 1", "Table 2" and "Table 3". Table 1 Valve Type Code Valve Type Code Valve Type Code Safety Valve A Ball Valve Q Butterfly Valve D Trap S Diaphragm Valve G Regulating Valve T Check Valve H Plunger Valve U Stop Valve J Plug Valve X Throttle Valve L Pressure Reducing Valve Y Drain valve P Gate valve Z "Table 2" Valve with other functions Function code Second function Function Name Code Second function Function Code Name Low-temperature type D Slow-closing type H Insulation type B Slag type P Bellows type W Purge Type C Retractable Flange Type S Flameproof Type FV Ball Type V Quick Type Q "Table 3 Corner Code with Special Structure Valve Code Specific Structure Name Code Specific Structure Designation Code Knob Flat Gate Valve D Water Seal Type S Diversion Hole-type gate valve K Without gate-type gate valve W (3) Drive code with Arabic numerals, according to "Table 4". "Table 4" Drive Mode Code Driving Mode Code Driving Mode Code Electromagnetic 0 Bevel Gear 5 Electro-hydraulic 1 Pneumatic 6 Electro-hydraulic 2 Hydraulic 7 Turbo 3 Gas-hydraulic 8 Spur gear 4 Electric 9 Note: Code 1, Code 2 and code 8 is used in the valve opening and closing, the need for two kinds of power at the same time the valve operation. Safety valve, hydraulic valve, water valve, handwheel directly connected to the stem operating structure of the valve, the code is omitted is not indicated. For pneumatic or hydraulic: normally open with 6K, 7K said; normally closed with 6B, 7B said; pneumatic band manually with 6S said Explosion-proof electric 9B said. (4) connection code in the form of Arabic numerals, in accordance with the "Table 5" requirements. "Table 5" Connection Type Code Connection Type Code Connection Type Code Internal thread 1 Pair Welding 6b External thread 2 Pair of clamps 7 Flange 4 Clamp 8 Socket welding 6s Clamp 9 (5) Valve Structure Code The code is represented by Arabic numerals, According to "Table 6" to "Table 16" requirements. "Table 6" Structure of the gate valve Code Structure Code Ming rod wedge flexible gate 0 rigid gate single gate 1 double gate 2 parallel single gate 3 double gate 4 dark wedge single gate 5 double gate Plate 6 parallel single gate 7 double gate 8 "Table 7" stop valve, throttle and plunger valve structure code structure code structure code direct 1 direct current 5 z form 2 balanced straight through 6 tee Type 3 Angle 7 Angle 4 "Table 8" Ball Valve Structure Code Name Structure Code Name Structure Code Floating Ball Straight 1 Fixed ball straight 7 Y-shaped three-way 2 Four-way 6 L-shaped 4 T-shaped three-way 8 T-shaped 5 L-shaped 9 hemispherical through 0 Table 9 Ball Valve Structure Code Name Structure Code Name Structure Code Sealing Medium Line 1 Non-hermetic Middle Line 6 Double Eccentric 2 Double Eccentric 7 Triple Eccentric 3 Triple Eccentric 8 Linkage 4 Connecting rod mechanism 9 "Table 10 Diaphragm valve structure code Structure code Code Structure code Roof 1 Straight 6 Stop 3 Angle Y 8 DC 5 Table 11 Plug Valve Structure Code Structure Structure Code Structure Code packing Sealing Straight Through 3 Oil Seal Straight Through 7 T-shaped 3-way 4 T-shaped 3-way 8 4-way 5 "Table 12 Check Valve Structure Type Code Structure Type Code Structure Type Code Lift Straight Through 1 Swing Single Flap 4 multi-valve type 5
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