Valve model and letter code

Valve model and letter code analysis The valve model consists of elements such as type, driving method connection form, structural form, sealing material, pressure level, and valve body material. The following is a classification description: 1. Valve type code The first letter the Chinese pinyin is used to indicate: Z: Gate valve J: Globe valve L: Throttle valve Q: Ball valve D: Butterfly H: Check valve A: Safety valve Y: Pressure reducing valve S: Steam trap G: Diaphragm valve X: Plug valveU: Plunger valve Special function supplement: Low-temperature valves (below -40℃) add D, with insulation function add B, bellows valves W12. 2. Driving method code Arabic numerals are used to indicate: 0: Electromagnetic 3: Worm drive 6: Pne 7: Hydraulic 9: Electric Special rules: Manual operation (handwheel, handle) or no driving device (such as safety valve, pressure reducing valve omits the code 34; Pneumatic normally open uses 6K, normally closed uses 6B; hydraulic normally open uses 7K, closed uses 7B; explosion-proof electric uses 9B34. 3. Connection form code Arabic numerals are used to indicate: 1: thread 2: External thread 4: Flange connection 6: Welding (butt welding/socket welding) 7: Clamping connection 8: Clamp connection9: Coupling connection. 4. Structural form code Different valve types correspond to different structural forms (indicated by Arabic numerals): Gate valve: 0: wedge elastic gate plate 1: Rising wedge rigid single gate plate 5: Non-rising wedge rigid single gate plate. Globe valve/throttle valve: 1 Straight through 4: Angle 6: Balanced straight through. Ball valve: 1: Floating straight through 7: Fixed ball straight through. Butterfly valve3: Inclined plate type. 5. Sealing surface or lining material code Letters are used to indicate: H: Cr system stainless steel P: 8-8 system stainless steel R: Mo2Ti system stainless steel T: Copper and copper alloys W: Body material (sealing surface and valve material are the same). 6. Pressure level representation The nominal pressure (PN) is represented by a number, such as PN16 corresponding to the pressure code16 (i.e., 10 times of 1.6MPa). 7. Valve body material code Letters are used to indicate: C: steel I: Chromium-molybdenum steel Q: Ductile iron Z: Grey cast iron. Example The model Z941-16C indicates: Z: Gate valve 9: Electric drive 4: Flange connection 1: Rising wedge rigid single gate plate H:13 stainless steel sealing surface 16: Nominal pressure 1.6MPa C: Carbon steel valve body