The coefficient of flow or Cv Value is the number of US gallons of water the valve will pass with a differential pressure of 1psi through the valve at 60°F.

Kv is the metric value of Cv and is calculated as Kv=Cv x 0.85.

Cv varies with both style and size of valve, but provides an index for comparing liquid capacities of different valves under a standard set of conditions. Table below provides Cv values of gate valves of three manufacturers. The gate valve suppliers shall be consulted for getting the actual applicable values.

For quick information select the valve size and rating to display the applicable Cv values in extracted table below.

Size Rating
NPS (DN) Velan Ringo Valvulas Australian Pipeline Valve

Size Size Class 150 Class 300 Class 600 Class 900 Class 1500 Class 2500
NPS DN Velan Ringo Valvulas Australian Pipeline Valve Velan Ringo Valvulas Australian Pipeline Valve Velan Ringo Valvulas Australian Pipeline Valve Velan Ringo Valvulas Australian Pipeline Valve Velan Ringo Valvulas Australian Pipeline Valve Velan Ringo Valvulas Australian Pipeline Valve
2 50 260 200 311 260 200 311 260 200 311 230 155 273 230 200 273 - 164 170
65 420 - 495 420 - 495 420 - 495 - - 397 - - 397 - - 273
3 80 625 710 72 625 710 72 625 710 724 560 650 665 510 600 604 - 275 397
4 100 1150 1300 1320 1150 1300 1320 1150 1300 1320 1050 1200 1239 925 1070 1078 - 460 660
6 150 2650 3100 3076 2650 3100 3076 2650 3100 3076 2400 2850 2815 2100 2500 2450 - 1100 1588
8 200 4850 5720 5608 4850 5720 5608 4850 5500 5434 4200 5025 4901 3650 4370 4244 - 1970 2815
10 250 7750 8940 8834 7750 8940 8834 7750 8485 8474 6750 7850 7817 5850 6850 6761 - 3130 4566
12 300 11500 13350 13071 11500 13350 13071 11500 12850 12509 9700 11500 11171 - 9980 9657 - 4535 6553
14 350 14000 16275 16074 14000 16275 16074 13000 15370 15151 12000 13900 13646 - 12000 11701 - 8368 8027
16 400 19000 21560 21554 19000 21560 21554 18000 20170 20106 16000 18150 18031 - 15675 15447 - 10955 10633
18 450 24000 28720 27876 23500 28790 27876 22000 26200 25406 - 23910 23056 - 20640 19766 - 14481 13646
20 500 31000 35760 35048 30000 34840 35048 27000 32100 31355 - 29550 28726 - 25880 25022 - 17587 16713
24 600 45000 52165 51973 44000 51050 51973 40000 46750 46312 - 42570 42027 - 31175 36507 - 21338 24610
26 650 53000 63500 61714 53000 62011 61714 38000 56300 54333 - 52167 49668 - 45514 - - - -
28 700 62000 74800 72387 62000 73046 72387 52000 65900 63023 - 60500 - - 53320 - - - -
30 750 73000 86325 83919 73000 84765 83919 82500 75520 73110 - 69452 - - 61095 - - - -
32 800 81000 103000 - 81000 100580 - - 85180 - - 79092 - - 73478 - - - -
34 850 92500 - - - - - 82500 - - - - - - - - - - -
36 900 108000 129500 119333 108000 125825 119333 72000 114250 114881 - 103212 - - 96862 - - - -
38 950 11500 - - - - - 103000 - - - - - - - - - - -
40 1000 130000 175860 - 129500 171740 - 115000 156127 - - - - - - - - - -
42 1050 142000 223300 163380 129500 217000 163380 - 197272 - - - - - - - - - -
44 1100 - - - - - - 144000 - - - - - - - - - - -
46 1150 171000 - - - - - - - - - - - - - - - - -
48 1200 190000 335500 215888 - 326000 215888 - - - - - - - - - - - -
50 1250 198000 - - - - - 190000 - - - - - - - - - - -
54 1350 238000 - 278938 - - 278938 - - - - - - - - - - - -
56 1400 260000 - - - - - - - - - - - - - - - - -
60 1500 300000 - - - - - - - - - - - - - - - - -
64 1600 340000 - - - - - - - - - - - - - - - - -