Lifting check valve refers to the valve that automatically opens and closes the disc depending on the flow of the medium itself to prevent medium backflow, also known as check valve, one-way valve, counterflow valve, and back pressure valve. Check valve is an automatic valve. Its main function is to prevent medium backflow, reverse pump and drive motor, and release of container medium. Check valves can also be used in pipelines to supply auxiliary systems where pressure may rise above system pressure. Check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
Technical data
| PN(MPa)Nominal pressure | 1.6 | 2.5 | 4.0 | |
| (MPa)Test pressure | Shell strength test | 2.4 | 3.75 | 6.0 |
| Seal test (Liquid) | 1.76 | 2.75 | 4.4 | |
| Seal test (Gas) | 0.5~0.7 | |||
| Suitable medium | water,steam,oil | PNiter acids | Roil | |
| Suitable temperature | ≤425 | ≤100 | ≤550 | |
Meterial of main parts
No. | Part name | Meterial | |
ASTM | GB | ||
1 | Valve body | WCB, WC1,WC6,WC9,C5 CF8,CF8M,CF8C,CF3,CF3M | WCB,WC1,WC6,WC9,C5 CF8,CF8M,CF8C,CF3,CF3M |
2 | Valve disc | WCB,WC1,WC6,WC9,C5 CF8,CF8M,CF8C,CF3,CF3M | WCB,WC1,WC6,WC9,C5 CF8,CF8M,CF8C,CF3,CF3M |
3 | Stud bolts | A193-B7,A320-B8,A193-B8M | 35CrMoA,25Cr2MoV,0CM8Ni9,0Cr17Ni12Mo2 |
4 | Hex nuts | A194-2H,A194-8,A194-8M | 45,35CrMoA,25Cr2MoV, 0Cr18Ni9,0Cr17Ni12Mo2 |
5 | Gasket | Flexible graphite + stainless steel | Flexible graphite + stainless steel |
6 | valve bonnet | A105,F11,F22,F5,F9 F304, F316, F321, F304L, F316L | 25,1Cr18Ni9Ni,0Cr18Ni12Mo2Ti 20Cr1Mo1V,25Cr2MoV |
Main dimensions
| PN(MPa) | DN(mm) | L | H | D | D1 | D2 | D6 | b | f | f2 | Z-ød |
| 1.6 | 15 | 130 | 77 | 95 | 65 | 45 | - | 14 | 2 | - | 4-14 |
| 20 | 150 | 77 | 105 | 75 | 55 | - | 14 | 2 | - | 4-14 | |
| 25 | 160 | 80 | 115 | 85 | 65 | - | 16 | 2 | - | 4-14 | |
| 32 | 180 | 85 | 135 | 100 | 78 | - | 16 | 2 | - | 4-18 | |
| 40 | 200 | 95 | 145 | 110 | 85 | - | 16 | 3 | - | 4-18 | |
| 50 | 230 | 105 | 160 | 125 | 100 | - | 16 | 3 | - | 4-18 | |
| 65 | 290 | 120 | 180 | 145 | 120 | - | 18 | 3 | - | 4-18 | |
| 80 | 310 | 130 | 195 | 160 | 135 | - | 20 | 3 | - | 8-18 | |
| 100 | 350 | 140 | 215 | 180 | 155 | - | 20 | 3 | - | 8-18 | |
| 125 | 400 | 155 | 245 | 210 | 185 | - | 22 | 3 | - | 8-18 | |
| 150 | 480 | 180 | 280 | 240 | 210 | - | 24 | 3 | - | 8-23 | |
| 200 | 600 | 245 | 335 | 295 | 265 | - | 26 | 3 | - | 12-23 | |
| 2.5 | 15 | 130 | 100 | 95 | 65 | 45 | - | 16 | 2 | - | 4-14 |
| 20 | 150 | 105 | 105 | 75 | 55 | - | 16 | 2 | - | 4-14 | |
| 25 | 160 | 120 | 115 | 85 | 65 | - | 16 | 2 | - | 4-14 | |
| 32 | 180 | 130 | 135 | 100 | 78 | - | 18 | 2 | - | 4-18 | |
| 40 | 200 | 135 | 145 | 110 | 85 | - | 18 | 3 | - | 4-18 | |
| 50 | 230 | 149 | 160 | 125 | 100 | - | 20 | 3 | - | 4-18 | |
| 80 | 310 | 169 | 195 | 160 | 135 | - | 22 | 3 | - | 8-18 | |
| 100 | 350 | 194 | 230 | 190 | 160 | - | 24 | 3 | - | 8-23 | |
| 150 | 480 | 255 | 300 | 250 | 218 | - | 30 | 3 | - | 8-25 | |
| 200 | 600 | 305 | 360 | 310 | 278 | - | 34 | 3 | - | 12-25 | |
| 4.0 | 15 | 130 | 100 | 95 | 65 | 45 | 40 | 16 | 2 | 4 | 4-14 |
| 20 | 150 | 105 | 105 | 75 | 55 | 51 | 16 | 2 | 4 | 4-14 | |
| 25 | 160 | 120 | 115 | 85 | 65 | 58 | 16 | 2 | 4 | 4-14 | |
| 32 | 180 | 130 | 135 | 100 | 78 | 66 | 18 | 2 | 4 | 4-18 | |
| 40 | 200 | 135 | 145 | 110 | 85 | 76 | 18 | 3 | 4 | 4-18 | |
| 50 | 230 | 149 | 160 | 125 | 100 | 88 | 20 | 3 | 4 | 4-18 | |
| 80 | 310 | 169 | 195 | 160 | 135 | 121 | 22 | 3 | 4 | 8-18 | |
| 100 | 350 | 194 | 230 | 190 | 160 | 150 | 24 | 3 | 4.5 | 8-23 | |
| 150 | 480 | 255 | 300 | 250 | 218 | 204 | 30 | 3 | 4.5 | 8-25 | |
| 200 | 600 | 305 | 375 | 320 | 282 | 260 | 38 | 3 | 4.5 | 12-30 |
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