Bray 31U - Manual (Page 16)

Resilient Seated Butterfly Valves – Valve Sizing Coefficients
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The technical data herein is for general information only. Product suitability should be based solely upon customer’s detailed knowledge and experience with their application.
Coefficients : 16
Series 30/31/31H/3A/3AH/31U - Valve Sizing Coefficient (Cv)
Valve
Size
Inches
Disc Position (Degrees)
10º 20º 30º 40º 50º 60º 70º 80º 90º
2 0.8 7 16 27 43 61 84 114 144
2.5 1 11 24 43 67 107 163 223 282
3 2 15 35 61 96 154 267 364 461
4 3 27 62 109 171 274 496 701 841
5 5 43 98 170 268 428 775 1,146 1,376
6 6 56 129 225 354 567 1,025 1,542 1,850
8 12 102 241 421 680 1,081 1,862 2,842 3,316
10 19 162 382 667 1,076 1,710 2,948 4,525 5,430
12 27 235 555 1,005 1,594 2,563 4,393 6,731 8,077
14 34 299 756 1,320 2,149 3,384 5,939 8,874 10,538
16 45 397 1,001 1,749 2,847 4,483 7,867 11,761 13,966
18 58 507 1,281 2,237 3,643 5,736 10,065 14,496 17,214
20 72 632 1,595 2,786 4,536 7,144 12,535 18,812 22,339
Series 32/33/35/36/35F/36H - Valve Sizing Coefficient (Cv)
Valve
Size
Inches
Disc Position (Degrees)
10º 20º 30º 40º 50º 60º 70º 80º 90º
22 103 916 2,070 3,510 5,640 9,036 14,562 22,028 27,168
24 259 1,028 2,387 4,244 6,962 11,040 18,235 27,186 33,154
26 289 1,141 2,752 4,890 7,824 12,496 19,921 29,700 36,220
28 295 1,324 3,133 5,399 8,636 13,838 22,578 34,683 41,619
30 420 1,652 3,986 7,080 11,328 18,090 28,844 43,003 52,443
32 550 2,026 4,636 7,983 12,743 20,410 32,591 48,558 60,658
34 533 2,304 5,210 8,834 14,194 22,741 36,648 55,438 68,374
36 740 2,775 5,936 9,790 15,572 25,053 40,086 59,667 77,089
40 757 2,971 6,925 11,862 19,307 30,636 50,406 73,990 90,175
42 783 3,502 7,879 12,997 21,010 35,016 54,584 83,421 102,989
44 904 4,066 8,698 14,346 22,818 36,712 58,740 87,430 112,960
48 1,023 4,651 10,365 17,010 27,242 43,853 70,431 108,968 132,888
52 Consult Factory
54 1,299 5,904 13,158 21,594 34,583 55,671 89,411 138,334 168,700
60 1,480 6,400 14,500 24,500 39,400 63,200 102,000 154,000 190,000
66 1,650 7,110 16,100 27,300 43,800 70,200 113,000 171,000 211,000
72 1,900 8,220 18,600 31,500 50,700 81,200 131,000 198,000 244,000
78 2,290 9,910 22,400 38,000 61,000 97,800 158,000 238,000 294,000
84 2,290 11,390 25,800 43,700 70,200 112,400 181,000 274,000 338,000
90 Consult Factory
96 Consult Factory