Butterfly valve model preparation and standards
1 model preparation
Type code (D means butterfly valve) structural form code (Table 1) connecting form code (Table 2) Transmission mode code (Table 3) the valve seat sealing surface, or lining material code (Table 4) Nominal pressure code , body materials code (Table 5)
| table 1 | table 2 | |||
| structural style | code | structural style | code | |
| lever type | 0 | flange | 4 | |
| Vertical Plate | 1 | wafer | 7 | |
| Swash Plate | 3 | welding | 6 |
| table 3 | table 4 | |||
| driving mode | code | seat sealing surface or lining material | code | |
| worm gear | 3 | alloy steel | H | |
| pneumatic | 6 | fluoroplastic | F | |
| hydraulic | 7 | hard alloy | Y | |
| electric | 9 | copper alloy | T |
| table 5 | |||
| valve material | code | valve material | code |
| WCB | C | CF8（304） | P8 |
| 1Cr5Mo ZG1Cr5Mo | I | CF3（304L） | P3 |
| 1Cr18Ni9TiZG1Cr18Ni9Ti | P | CF8M（316） | R8 |
| 1Cr18Ni12Mo2TiZG1Cr18Ni12Mo2Ti | R | CF3M（316L） | R3 |
2 standard
Product standard：JB/T8527-97
Flange connecting dimensions：GB9113.1-9113.26-88 overall steel pipe flange: GB9115.1-9115.36-88；butt welded steel pipe flange
face to face dimension：GB/T5188.2-94；wafer connection valve face to face dimension
GB/T12221-89 flange connection valve face to face dimension；
pressure test：GB/T13927-92 general valve pressure test
