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Weir Diaphragm Valves - Flow Coefficients and Flow Factors

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Typical flow coefficients - Cv - and flow factors - Kv - for weir diaphragm flanged cast iron valves of "Saunders" type:

Valve SizeUnlinedRubber LinedHalar/Glass LinedPlastic Lined
DNInchesCvKvCvKvCvKvCvKv
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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Valves Selection Guide

Applications guide for selecting valves.

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