Product features of national standard swing check valve
1. The product has reasonable structure, reliable sealing, excellent performance and beautiful appearance;
2. The sealing surface is overlaid with Co based cemented carbide, which has good wear resistance, corrosion resistance, scratch resistance and long service life;
3. Built in pin shaft structure reduces external leakage and is reliable in use;
4. When the pressure is greater than or equal to 16.0mpa, the self tightening sealing structure is adopted in the middle chamber of the valve. The higher the medium pressure is, the better the sealing performance is;
5. The material and size of flange and butt welding end can be reasonably selected according to actual working conditions or user requirements to meet various engineering needs.
Main performance specifications
| Design criteria | GB/T 12236 | ||||||
| Pressure temperature class | GB/T 12224 | ||||||
| Structural length | GB/T 12221、GB/T 15188.1 | ||||||
| Flange type and size | GB/T 9113、JB/T 79、EN1092、ASME B16.5/B16.47 | ||||||
| Butt welding end connection | GB/T 12224 | ||||||
| Inspection and test | JB/T 9092、GB/T13927、API598 | ||||||
| Test pressure | Nominal pressure | PN1.6 | PN2.5 | PN4.0 | PN6.4 | PN10.0 | PN16.0 |
| Shell test | 2.4 | 3.8 | 6.0 | 9.6 | 15.0 | 24.0 | |
| High pressure seal | 1.8 | 2.8 | 4.4 | 7.1 | 11.0 | 17.6 | |
| Low pressure seal | 0.6 | ||||||
Material of main parts
| Part name | carbon steel | stainless steel | Alloy steel | Low temperature steel |
| valve body | WCB | CF8 | WC6 | LCB |
| valve seat | 25# | 0Cr18Ni9(304) | 12Cr1MoVA | 0Cr18Ni9(304) |
| Disc | WCB | CF8 | WC6 | LCB |
| rocker | 20Cr13 | 304 | 20Cr13 | LCB |
| pin shaft | 1Cr13 | 0Cr18Ni9(304) | 0Cr18Ni9(304) | 0Cr18Ni9(304) |
| Connecting frame | WCB | CF8 | WC6 | LCB |
| shim | Flexible graphite | Flexible graphite | Flexible graphite | Flexible graphite |
| Valve cover | WCB | CF8 | WC6 | LCB |
| Double head stud | 35CrMoA | 0Cr18Ni9(304)/B8 | B16/25Cr2MoVA | 35CrMoA/B7 |
| Nut | 45# | 0Cr18Ni9(304)/8 | 7/35CrMoA | 45/2H |
Design drawings
Main connecting dimensions of national standard swing check valve
| MPa | DN(mm) | L | D | D1 | D2 | b | f | Z-Φd | H | WT(kg) |
| PN1.6 | 50 | 230 | 165 | 125 | 102 | 18 | 3 | 4-Φ18 | 135 | 21 |
| 65 | 290 | 185 | 145 | 122 | 18 | 3 | 8-Φ18 | 142 | 28 | |
| 80 | 310 | 200 | 160 | 138 | 20 | 3 | 8-Φ18 | 165 | 38 | |
| 100 | 350 | 220 | 180 | 158 | 20 | 3 | 8-Φ18 | 180 | 58 | |
| 125 | 400 | 250 | 210 | 188 | 22 | 3 | 8-Φ18 | 210 | 92 | |
| 150 | 480 | 285 | 240 | 212 | 22 | 3 | 8-Φ22 | 233 | 130 | |
| 200 | 600 | 340 | 295 | 268 | 24 | 3 | 12-Φ22 | 304 | 210 | |
| 250 | 730 | 405 | 355 | 320 | 26 | 3 | 12-Φ26 | 348 | 294 | |
| 300 | 850 | 460 | 410 | 378 | 28 | 4 | 12-Φ26 | 390 | 367 | |
| 350 | 980 | 520 | 470 | 438 | 30 | 4 | 16-Φ26 | 430 | 410 | |
| 400 | 1100 | 580 | 525 | 490 | 32 | 4 | 16-Φ30 | 468 | 461 | |
| 450 | 1200 | 640 | 585 | 550 | 40 | 4 | 20-Φ30 | 523 | 570 | |
| 500 | 1250 | 715 | 650 | 610 | 44 | 4 | 20-Φ33 | 525 | 850 | |
| PN2.5 | 50 | 230 | 165 | 125 | 102 | 20 | 3 | 4-Φ18 | 160 | 22 |
| 65 | 290 | 185 | 145 | 122 | 22 | 3 | 8-Φ18 | 175 | 29 | |
| 80 | 310 | 200 | 160 | 138 | 24 | 3 | 8-Φ18 | 185 | 38 | |
| 100 | 350 | 235 | 190 | 162 | 24 | 3 | 8-Φ22 | 220 | 61 | |
| 125 | 400 | 270 | 220 | 188 | 26 | 3 | 8-Φ26 | 248 | 96 | |
| 150 | 480 | 300 | 250 | 218 | 28 | 3 | 8-Φ26 | 276 | 132 | |
| 200 | 600 | 360 | 310 | 278 | 30 | 3 | 12-Φ26 | 350 | 213 | |
| 250 | 730 | 425 | 370 | 335 | 32 | 3 | 12-Φ30 | 410 | 297 | |
| 300 | 850 | 485 | 430 | 395 | 34 | 4 | 16-Φ30 | 430 | 372 | |
| 350 | 980 | 555 | 490 | 450 | 38 | 4 | 16-Φ33 | 518 | 415 | |
| 400 | 1100 | 620 | 550 | 505 | 40 | 4 | 16-Φ36 | 560 | 480 | |
| 450 | 1200 | 670 | 600 | 555 | 46 | 4 | 20-Φ36 | 582 | 610 | |
| 500 | 1250 | 730 | 660 | 615 | 48 | 4 | 20-Φ36 | 618 | 920 |
