Technical specification:
| Structural formation | Spiral shell's post bonnet lifting type check valve |
| Design reference | GB / API |
| Design standard | GB/T 12235 / API6D、BS1868 |
| Face to face | GB/T 12221 / ASME B16.10 |
| Flanged ends | GB/T 9113、HG/T 20592 / ASME B16.5 |
| Test & inspection | GB/T 13927、JB/T 9092 / API598、BS6755 |
Note: The sizes of valve connecting flange and butt-welding terminas can be designed according to customer's requirement
Major parts material form:
| No | Part name | GB Material | ASTM Material |
| 1 | Body | WCB、WC1、WC6、WC9、C5、CF8、CF8M、CF8C、CF3、CF3M | WCB、WC1、WC6、WC9、C5、CF8、CF8M、CF8C、CF3、CF3M |
| 2 | Disc | WCB、WC1、WC6、WC9、C5、CF8、CF8M、CF8C、CF3、CF3M | WCB、WC1、WC6、WC9、C5、CF8、CF8M、CF8C、CF3、CF3M |
| 3 | Stud | 35CrMoA、25Cr2Mov、0Cr18Ni9、0Cr17Ni12Mo2 | A193-B7、A320-B8、A193-B8M、A193-B16 |
| 4 | Six angle nuts | 45、35CrMoA、25Cr2Mov、0Cr18Ni9、0Cr17Ni12Mo2 | A194-2H、A194-8、A194-8M、A194-4 |
| 5 | Gasket | Graphite & stainless steel | Graphite & stainless steel |
| 6 | Bonnet | WCB、WC1、WC6、WC9、C5、CF8、CF8M、CF8C、CF3、CF3M | WCB、WC1、WC6、WC9、C5、CF8、CF8M、CF8C、CF3、CF3M |