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Typical flow coefficients - Cv - and flow factors - Kv - of weir diaphragm valves of "Saunders" type
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The table below indicates typical flow coefficients - Cv - and flow
factors - Kv - for weir diaphragm flanged cast iron valves of
"Saunders" type.
| Valve Size | Unlined | Rubber Lined | Halar/Glass Lined |
Plastic Lined |
|||||
| DN | Inches | Cv | Kv | Cv | Kv | Cv | Kv | Cv | Kv |
| 15 | 6 | 5 | 6 | 5 | |||||
| 20 | 12 | 10 | 9 | 8 | 12 | 10 | 7 | 6 | |
| 25 | 1 | 18 | 15 | 14 | 12 | 18 | 16 | 11 | 10 |
| 32 | 1 | 28 | 24 | 22 | 19 | 28 | 24 | 17 | 14 |
| 40 | 1 | 43 | 37 | 35 | 30 | 45 | 39 | 31 | 27 |
| 50 | 2 | 80 | 69 | 64 | 55 | 88 | 76 | 59 | 51 |
| 65 | 2 | 127 | 109 | 102 | 88 | 132 | 114 | 83 | 72 |
| 80 | 3 | 185 | 159 | 148 | 128 | 186 | 160 | 148 | 128 |
| 100 | 4 | 315 | 272 | 252 | 217 | 336 | 290 | 270 | 233 |
| 125 | 5 | 420 | 362 | 363 | 313 | 440 | 379 | ||
| 150 | 6 | 605 | 522 | 484 | 417 | 630 | 543 | 505 | 435 |
| 200 | 8 | 1 300 | 1 121 | 1 309 | 1 128 | 1 320 | 1 138 | ||
| 225 | 9 | 1 630 | 1 405 | 1 320 | 1 138 | 1 680 | 1 448 | ||
| 250 | 10 | 1 980 | 1 707 | 2 000 | 1 724 | 2 100 | 1 810 | ||
| 300 | 12 | 2 550 | 2 198 | 2 600 | 2 241 | 2 700 | 2 328 | ||
| 350 | 14 | 3 700 | 3 190 | 3 750 | 3 233 | 3 880 | 3 345 | ||
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