Batley Butterfly Valves - Weir Power & Industrial - #30

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30 Weir Power & Industrial First choice for power and industrial protection Batley Valve BV 6-0810 VARIDIFF VANE BV30000 Swing Through Varidiff CV Values Class 150lb CV Values For Hyperseal Varidiff Class 150lb Please note that the Cv’s shown above are for guidance only as Cv’s will change dependent on shaft size and the design of the Varidiff trim, which can vary with the required duty. Recommended Maximum Velocities For Liquid Service Recommended maximum velocities for gas/vapour service Sizing & Selection Figure 4. Typical Varidiff characteristic curve Figure 5. Comparison between cavitation coefficient for Varidiff and Standard Vane Valve Size Valve opening mm 90° 80° 70° 60° 50° 40° 30° 20° 10° 100 400 320 220 152 100 64 40 20 7 125 625 500 344 237 156 100 63 31 12 150 899 719 495 341 224 144 90 44 17 200 1599 1279 880 607 399 256 160 79 29 250 2498 1998 1374 949 624 400 250 124 46 300 3598 2878 1979 1366 898 576 360 178 66 350 4621 3696 2542 1755 1154 739 463 229 85 400 6080 4863 3344 2309 1518 973 609 301 112 450 7739 6189 4257 2939 1933 1238 775 383 142 500 9598 7676 5279 3645 2397 1535 961 475 177 600 13915 11129 7654 5284 3475 2226 1393 689 256 700 19032 15221 10469 7227 4753 3044 1905 942 350 750 21890 17507 12041 8313 5466 3501 2192 1083 403 800 24948 19953 13723 9474 6230 3991 2498 1234 459 900 31663 25323 17416 12024 7907 5065 3170 1567 583 1000 39179 31334 21551 14878 9783 6267 3922 1939 721 1200 56607 45273 31137 21496 14135 9055 5667 2801 1042 Valve Size Valve opening mm 90° 80° 70° 60° 50° 40° 30° 20° 10° 100 221 177 122 84 55 35 22 11 4 125 353 282 194 134 88 56 35 17 6 150 662 529 364 251 165 106 66 33 12 200 1205 964 663 458 301 193 121 60 22 250 2030 1624 1117 771 507 325 203 100 37 300 3016 2412 1659 1145 753 482 302 149 56 350 3808 3046 2095 1446 951 609 381 188 70 400 5059 4046 2783 1921 1263 809 506 250 93 450 6455 5163 3551 2451 1612 1033 646 319 119 500 7818 6253 4300 2969 1952 1251 783 387 144 600 11436 9146 6290 4343 2856 1829 1145 566 211 700 16167 12930 8893 6139 4037 2586 1619 800 298 750 18710 14964 10292 7105 4672 2993 1873 926 344 800 21395 17111 11768 8125 5343 3422 2142 1059 394 900 25336 20263 13936 9621 6327 4053 2537 1254 466 1000 33043 26427 18176 12548 8251 5285 3308 1635 608 Valve Size Body Material ins mm Carbon steel 316 + Duplex Ali-bronze ft/sec m/sec ft/sec m/sec ft/sec m/sec 4-12 100-300 30 9 30 9 20 6.1 14-24 350-600 18 5.5 18 5.5 14 4.3 Above Above 12 3.6 12 3.6 9 2.7 24 600 Valve Size Max. Inlet Max. Outlet Max. Outlet Mach No. for required noise level ins mm ft/s m/s ft/s m/s >95 dBA <95 dBA <85 dBA 4-12 100-300 200 61 14-24 350-600 100 30 350 107 0.3 0.25 0.2 Above Above 80 24 24 600 Figure 3. Static pressure recovery