一、对夹升降式止回阀的流体阻力系数、流量用开启压力
| 公称通径 | 阀门全开启时的流体阻力系数ζ | 常温下阀门全开启时的水流量系数 | 流体的流向 | |||||
| DN | NPS | Kv(m3/h) | CV(U.S) | CV(U.K) | ↑ | ↓ | → | |
| 开启压力近似的值KPa | ||||||||
| 15 | 1/2 | 6.4 | 2.6 | 3.0 | 2.5 | 3 | 2 | 2.5 |
| 20 | 3/4 | 5.1 | 6.4 | 7.5 | 6.3 | 3 | 2 | 2.5 |
| 25 | 1 | 4.1 | 12.6 | 14.8 | 12.3 | 3 | 2 | 2.5 |
| 32 | 11/4 | 4.1 | 19.7 | 23.1 | 19.3 | 3 | 2 | 2.5 |
| 40 | 11/2 | 3.8 | 29.5 | 34.5 | 28.9 | 3 | 2 | 2.5 |
| 50 | 2 | 3.5 | 54.6 | 63.9 | 53.5 | 3 | 2 | 2.5 |
| 65 | 21/2 | 3.5 | 85.4 | 99.9 | 83.7 | 3 | 2 | 2.5 |
| 80 | 3 | 3.2 | 128 | 150 | 125 | 3 | 2 | 2.5 |
| 100 | 4 | 2.8 | 244 | 286 | 249 | 3 | 2 | 2.5 |
| 125 | 5 | 2.9 | 375 | 439 | 368 | 3 | 1 | 2.2 |
| 150 | 6 | 3.1 | 522 | 611 | 512 | 3 | 1 | 2.2 |
| 200 | 8 | 3.2 | 915 | 1070 | 897 | 3 | 1 | 2.2 |