Bray 31U - Manual (Page 18)

Resilient Seated Butterfly Valves – Valve Sizing Coefficients
All information herein is proprietary and confidential and may not be copied or reproduced without the expressed written consent of BRAY INTERNATIONAL, Inc.
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 : 18
Series 30/31/31H/3A/3AH/31U - Valve Sizing Coefficient (Kv)
Valve
Size
mm
Disc Position (Degrees)
10º 20º 30º 40º 50º 60º 70º 80º 90º
50 0.692 6.055 13.840 23.355 37.195 52.765 72.660 98.610 124.560
65 0.865 9.515 20.760 37.195 57.955 92.555 140.995 192.895 243.930
80 1.730 12.975 30.275 52.765 83.040 133.210 230.955 314.860 398.765
100 2.595 23.355 53.630 94.285 147.915 237.010 429.040 606.365 727.465
125 4.325 37.195 84.770 147.050 231.820 370.220 670.375 991.290 1,190.240
150 5.190 48.440 111.585 194.625 306.210 490.455 886.625 1,333.830 1,600.250
200 10.380 88.230 208.465 364.165 588.200 935.065 1,610.630 2,458.330 2,868.340
250 16.435 140.130 330.430 576.955 930.740 1,479.150 2,550.020 3,914.125 4,696.950
300 23.355 203.275 480.075 869.325 1,378.810 2,216.995 3,799.945 5,822.315 6,986.605
350 29.410 258.635 653.940 1,141.800 1,858.885 2,927.160 5,137.235 7,676.010 9,115.370
400 38.925 343.405 865.865 1,512.885 2,462.655 3,877.795 6,804.955 10,173.265 12,080.590
450 50.170 438.555 1,108.065 1,935.005 3,151.195 4,961.640 8,706.225 12,539.040 14,890.110
500 62.280 546.680 1,379.675 2,409.890 3,923.640 6,179.560 10,842.775 16,272.380 19,323.235
Series 32/33/35/36/35F/36H - Valve Sizing Coefficient (Kv)
Valve
Size
mm
Disc Position (Degrees)
10º 20º 30º 40º 50º 60º 70º 80º 90º
550 89.095 792.340 1,790.550 3,036.150 4,878.600 37,887.000 12,596.130 19,054.220 23,500.320
600 224.035 889.220 2,064.755 3,671.060 6,022.130 43,855.500 15,773.275 23,515.890 28,678.210
650 249.985 986.965 2,380.480 4,229.850 6,767.760 52,765.000 17,231.665 25,690.500 31,330.300
700 255.175 1,145.260 2,710.045 4,670.135 7,470.140 60,723.000 19,529.970 30,000.795 36,000.435
750 363.300 1,428.980 3,447.890 6,124.200 9,798.720 37,887.000 24,950.060 37,197.595 45,363.195
800 475.750 1,752.490 4,010.140 6,905.295 11,022.695 43,855.500 28,191.215 42,002.670 52,469.170
850 461.045 1,992.960 4,506.650 7,641.410 12,277.810 52,765.000 31,700.520 47,953.870 59,143.510
900 640.100 2,400.375 5,134.640 8,468.350 13,469.780 60,723.000 34,674.390 51,611.955 66,681.985
1,000 654.805 2,569.915 5,990.125 10,260.630 16,700.555 37,887.000 43,601.190 64,001.350 78,001.375
1,050 677.295 3,029.230 6,815.335 11,242.405 18,173.650 43,855.500 47,215.160 72,159.165 89,085.485
1,100 781.960 3,517.090 7,523.770 12,409.290 19,737.570 52,765.000 50,810.100 75,626.950 97,710.400
1,200 884.895 4,023.115 8,965.725 14,713.650 23,564.330 60,723.000 60,922.815 94,257.320 114,948.120
1,300 Consult Factory
1,400 1,123.635 5,106.960 11,381.670 18,678.810 29,914.295 48,155.415 77,340.515 119,658.910 145,925.500
1,500 1,280.200 5,536.000 12,542.500 21,192.500 34,081.000 54,668.000 88,230.000 133,210.000 164,350.000
1,650 1,427.250 6,150.150 13,926.500 23,614.500 37,887.000 60,723.000 97,745.000 147,915.000 182,515.000
1,800 1,643.500 7,110.300 16,089.000 27,247.500 43,855.500 70,238.000 113,315.000 171,270.000 211,060.000
2,000 1,980.850 8,572.150 19,376.000 32,870.000 52,765.000 84,597.000 136,670.000 205,870.000 254,310.000
2,200 1,980.850 9,852.350 22,317.000 37,800.500 60,723.000 97,226.000 156,565.000 237,010.000 292,370.000
2,250 Consult Factory
2,400 Consult Factory